This document discusses 8 concepts related to how structures appear on panoramic radiographs:
1. Structures adjacent to tooth-bearing areas are visualized, such as the mandible, maxillary sinus, and TMJ structures.
2. Structures are flattened and spread out across the radiograph, similar to paint being rolled onto a wall.
3. Midline structures can appear as single or double images depending on their location relative to the rotation center.
4. Ghost images are formed when objects are behind the rotation center.
5. Soft tissue shadows outline tissues like the tongue, lips and nasal turbinates.
6. Air spaces like the maxillary sinus appear black on
brief description about CONTENTS Introduction Principles of panoramic imaging Image layer Panoramic machines Panoramic film Patient positioning Interpreting the panoramic imaging INDICATION Advantages Disadvantages Conclusion References
3. INTRODUCTION • Panoramic imaging also called pantomography is a technique for producing a single tomographic image of facial structures that includes both the maxillary and mandibular dental arches and their supporting structures . • This is a curvilinear variant of conventional tomography.
4. PRINCIPLES OF PANORAMIC IMAGE FORMATION • Patero and Numata - describe the principles of panoramic radiography • based on the principle of reciprocal movement of x-ray source and an image receptor around a central point or plane called the image layer, in which the OBJECT of image is located. • OBJECT in front or behind this image are not clearly captured because of their movement relative to the centre of rotation of the receptor and the x-ray source.
5. The film and x-ray tubehead move around the patient in opposite directions in panoramic radiography
6. ROTATION CENTER The pivotal point or axis around which the cassette carrier and tube head rotate is termed rotation center Three basic rotation center used in panoramic radiography Double centre rotation Triple centre rotation moving centre rotation The location and number of rotational centers INFLUENCE size and shape of focal trough
7. IMAGE LAYER • Also known as focal trough • It is a three dimensional curved zone where the structures lying within this layer are reasonably well defined on final panoramic image. • The structures seen on a panoramic image are primarily those located within image layer. • OBJECTSoutside the image layer are blurred magnified are reduced in size. Even distorted to the extent of not being recognizable. • This shape of image layer varies with the brand of equipment used.
8. FOCAL TROUGH
9. FACTORS AFFECTING SIZE OF IMAGE LAYER: Arc path Velocity of receptor and X-ray tube head Alignment of x-ray beam Collimator width The location of image layer change with extensive machine used so recalibration may be necessary if consistently suboptimal images are produced. As a position of object is moved within the image layer size and shape of image layer change.
10. PANORAMIC UNIT
11. A, Orthophos XG Plus extraoral x-ray machine. B, Orthoralix 8500 extraoral x-ray machine. C, Example of a digital panoramic system
12. PARTS OF PANORAMIC UNITS a. x-ray tube head b. head positioner: chin rest notched bite block forehead rest lateral head support c. exposure controls
13. X-RAY TUBE HEAD: • Similar to intraoral x-ray tube head • Each has a filament to produce electrons and a target to produce x-rays • Collimator is a lead plate with narrow vertical slit • Narrow x-ray beam emerges from collimator minimize patient exposure to radiation
1
This document discusses dental radiography and x-rays. It defines key terms like radiograph and radiology. It describes the components of a dental x-ray unit and different types of radiographs like bitewings and panoramic x-rays. It discusses techniques like paralleling, bisecting angle technique and SLOB technique. It also covers topics like indications for radiographs, radiation safety, and advantages and disadvantages of digital radiography compared to conventional film.
This document discusses panoramic radiography, including its history, advantages, procedure details, and principles of image formation. Panoramic radiography uses a rotating x-ray beam and receptor to create a single image of the facial structures, including teeth and supporting bones. It provides broad anatomic coverage with a low radiation dose compared to full-mouth intraoral x-rays. Proper patient positioning is needed to place the dental arches within the "focal trough" where structures will be reasonably defined.
This document provides an overview of panoramic radiography. It begins with an introduction and then discusses the history, terminology, principles, concepts, equipment, positioning requirements, and indications of panoramic radiography. The key points covered include that panoramic radiography produces a single tomographic image of the facial structures using a rotating x-ray beam and that the image layer is a curved zone where structures appear in focus on the final image. Advantages are that it shows a wide area in a single image while disadvantages include some distortion and structures being out of focus above and below the image layer.
Digital imaging involves converting analog x-ray signals into digital images. This document discusses various digital imaging receptors and techniques. CCD and CMOS detectors convert x-ray exposure into electric signals. DSR produces images of changes by subtracting baseline images from follow-up images. PSP plates use stimulated luminescence to form digital images. CBCT and CT use x-rays to create 3D volumetric images but CBCT has lower radiation dose. MRI uses strong magnetic fields and radio waves to form images based on the magnetic properties of hydrogen atoms and does not use radiation. Each technique has advantages and limitations for various dental and medical applications.
This document summarizes the history and types of image receptors used in radiography. It discusses how image receptors have evolved from early glass plates wrapped in black paper in the 1900s to digital receptors like CCDs and CMOS used today. The main types of image receptors discussed are radiographic film, including direct and indirect action film, and digital receptors such as CCDs, CMOS, photostimulable phosphor plates, and flat panel detectors. Radiographic film can be single or double coated and comes in various speeds for different applications. Digital receptors allow for the digital capture and storage of radiographic images.
Panoramic radiography produces a single tomographic image of the facial structures including the maxillary and mandibular arches. It uses the principle of reciprocal movement of an X-ray source and image receptor around a central point or plane called the image layer. Multiple centers of rotation are used to maintain the dental arches within the focal trough. Panoramic radiography provides a broad anatomical view with less radiation than full-mouth intraoral films but has less resolution and potential for superimposition artifacts. It is useful for trauma evaluation, orthodontic treatment planning, and detection of lesions or developmental anomalies too large for intraoral films.
Latent Image formation & Dark room Chemistry.pptxssuser71d7b1
This document discusses latent image formation on dental radiographic film and the darkroom chemistry involved in processing the film. It begins by explaining how x-ray photons interact with silver halide crystals in the film emulsion to form a latent image. It then describes the key components and functions of the darkroom, including safe lighting, temperature and humidity control. Finally, it provides details on manual and automatic film processing, the chemical compositions and purposes of developer and fixer solutions, and some additional darkroom techniques.
brief description about CONTENTS Introduction Principles of panoramic imaging Image layer Panoramic machines Panoramic film Patient positioning Interpreting the panoramic imaging INDICATION Advantages Disadvantages Conclusion References
3. INTRODUCTION • Panoramic imaging also called pantomography is a technique for producing a single tomographic image of facial structures that includes both the maxillary and mandibular dental arches and their supporting structures . • This is a curvilinear variant of conventional tomography.
4. PRINCIPLES OF PANORAMIC IMAGE FORMATION • Patero and Numata - describe the principles of panoramic radiography • based on the principle of reciprocal movement of x-ray source and an image receptor around a central point or plane called the image layer, in which the OBJECT of image is located. • OBJECT in front or behind this image are not clearly captured because of their movement relative to the centre of rotation of the receptor and the x-ray source.
5. The film and x-ray tubehead move around the patient in opposite directions in panoramic radiography
6. ROTATION CENTER The pivotal point or axis around which the cassette carrier and tube head rotate is termed rotation center Three basic rotation center used in panoramic radiography Double centre rotation Triple centre rotation moving centre rotation The location and number of rotational centers INFLUENCE size and shape of focal trough
7. IMAGE LAYER • Also known as focal trough • It is a three dimensional curved zone where the structures lying within this layer are reasonably well defined on final panoramic image. • The structures seen on a panoramic image are primarily those located within image layer. • OBJECTSoutside the image layer are blurred magnified are reduced in size. Even distorted to the extent of not being recognizable. • This shape of image layer varies with the brand of equipment used.
8. FOCAL TROUGH
9. FACTORS AFFECTING SIZE OF IMAGE LAYER: Arc path Velocity of receptor and X-ray tube head Alignment of x-ray beam Collimator width The location of image layer change with extensive machine used so recalibration may be necessary if consistently suboptimal images are produced. As a position of object is moved within the image layer size and shape of image layer change.
10. PANORAMIC UNIT
11. A, Orthophos XG Plus extraoral x-ray machine. B, Orthoralix 8500 extraoral x-ray machine. C, Example of a digital panoramic system
12. PARTS OF PANORAMIC UNITS a. x-ray tube head b. head positioner: chin rest notched bite block forehead rest lateral head support c. exposure controls
13. X-RAY TUBE HEAD: • Similar to intraoral x-ray tube head • Each has a filament to produce electrons and a target to produce x-rays • Collimator is a lead plate with narrow vertical slit • Narrow x-ray beam emerges from collimator minimize patient exposure to radiation
1
This document discusses dental radiography and x-rays. It defines key terms like radiograph and radiology. It describes the components of a dental x-ray unit and different types of radiographs like bitewings and panoramic x-rays. It discusses techniques like paralleling, bisecting angle technique and SLOB technique. It also covers topics like indications for radiographs, radiation safety, and advantages and disadvantages of digital radiography compared to conventional film.
This document discusses panoramic radiography, including its history, advantages, procedure details, and principles of image formation. Panoramic radiography uses a rotating x-ray beam and receptor to create a single image of the facial structures, including teeth and supporting bones. It provides broad anatomic coverage with a low radiation dose compared to full-mouth intraoral x-rays. Proper patient positioning is needed to place the dental arches within the "focal trough" where structures will be reasonably defined.
This document provides an overview of panoramic radiography. It begins with an introduction and then discusses the history, terminology, principles, concepts, equipment, positioning requirements, and indications of panoramic radiography. The key points covered include that panoramic radiography produces a single tomographic image of the facial structures using a rotating x-ray beam and that the image layer is a curved zone where structures appear in focus on the final image. Advantages are that it shows a wide area in a single image while disadvantages include some distortion and structures being out of focus above and below the image layer.
Digital imaging involves converting analog x-ray signals into digital images. This document discusses various digital imaging receptors and techniques. CCD and CMOS detectors convert x-ray exposure into electric signals. DSR produces images of changes by subtracting baseline images from follow-up images. PSP plates use stimulated luminescence to form digital images. CBCT and CT use x-rays to create 3D volumetric images but CBCT has lower radiation dose. MRI uses strong magnetic fields and radio waves to form images based on the magnetic properties of hydrogen atoms and does not use radiation. Each technique has advantages and limitations for various dental and medical applications.
This document summarizes the history and types of image receptors used in radiography. It discusses how image receptors have evolved from early glass plates wrapped in black paper in the 1900s to digital receptors like CCDs and CMOS used today. The main types of image receptors discussed are radiographic film, including direct and indirect action film, and digital receptors such as CCDs, CMOS, photostimulable phosphor plates, and flat panel detectors. Radiographic film can be single or double coated and comes in various speeds for different applications. Digital receptors allow for the digital capture and storage of radiographic images.
Panoramic radiography produces a single tomographic image of the facial structures including the maxillary and mandibular arches. It uses the principle of reciprocal movement of an X-ray source and image receptor around a central point or plane called the image layer. Multiple centers of rotation are used to maintain the dental arches within the focal trough. Panoramic radiography provides a broad anatomical view with less radiation than full-mouth intraoral films but has less resolution and potential for superimposition artifacts. It is useful for trauma evaluation, orthodontic treatment planning, and detection of lesions or developmental anomalies too large for intraoral films.
Latent Image formation & Dark room Chemistry.pptxssuser71d7b1
This document discusses latent image formation on dental radiographic film and the darkroom chemistry involved in processing the film. It begins by explaining how x-ray photons interact with silver halide crystals in the film emulsion to form a latent image. It then describes the key components and functions of the darkroom, including safe lighting, temperature and humidity control. Finally, it provides details on manual and automatic film processing, the chemical compositions and purposes of developer and fixer solutions, and some additional darkroom techniques.
Panoramic radiography, also known as dental panoramic tomography (DPT), produces a single image of the facial structures including both dental arches. It utilizes a technique called tomography, which produces radiographs of a thin section or slice of the patient. In panoramic radiography, the x-ray tube and film rotate synchronously around the patient's head within a focal trough, producing multiple images that are merged into a single panoramic view. This provides visualization of teeth and jaws while minimizing radiation exposure compared to full mouth x-rays. Exact patient positioning is important for obtaining diagnostic quality images.
This document provides information on the processing of dental radiographs, including definitions of key terms, the formation of latent images, film processing solutions and procedures, darkroom requirements, and various processing methods. It describes how exposure to radiation results in chemical changes in the film's silver halide crystals to form a latent image, which is then made visible through development and fixing solutions. The roles of developer solutions, fixing solutions, and processing equipment are summarized.
This document discusses collimation and filtration in dental x-rays. It explains that collimators are used to restrict the size of the x-ray beam in order to minimize radiation exposure and scattered radiation. There are different types of collimators including diaphragm, round, rectangular, and slit collimators. Filtration is also discussed, which involves removing low-energy photons from the beam to reduce unnecessary radiation exposure while maintaining diagnostic image quality. Common filtration materials mentioned are aluminum, copper, tin, and lead. The effects of proper collimation and filtration are to harden the beam and reduce radiation dose to patients.
CBCT stands for cone beam computed tomography. It is a 3D imaging technique that uses a cone-shaped X-ray beam to capture volumetric images of the teeth, jaws, and surrounding structures. CBCT provides more detailed views than conventional 2D X-rays and exposes patients to less radiation than traditional medical CT scans. It has various applications in dentistry, including implant planning, endodontics, surgery, and orthodontics by allowing visualization of hard tissues and their relationship to anatomical structures.
This document provides information on periapical radiography. It discusses the history and types of dental x-rays, including periapical radiographs. Periapical radiographs are used to detect abnormalities of the root structure and surrounding bone. The document outlines techniques for proper positioning during periapical radiography, including the paralleling technique and bisected angle technique. It also discusses advantages and disadvantages of each technique as well as indications for periapical radiography.
This document discusses common radiographic errors and artifacts that can occur during dental x-ray procedures. It identifies three main categories of errors: technique and projection errors, exposure errors, and processing errors. Technique errors include issues with patient preparation, film placement, and projection angles. Exposure errors result in over or underexposed images. Processing errors stem from chemical or film handling issues during development and fixing of the x-ray film. The document provides examples and explanations of specific errors like double images, cut-off areas, density problems, and chemical or physical marks that can affect image quality and interpretation.
The document discusses the proper positioning for a Waters projection x-ray exam, including tilting the patient's head upward at a 37 degree angle with the canthomeatal line perpendicular to the image receptor. The central x-ray beam should be perpendicular to and centered on the image receptor in the area of the maxillary sinuses. A properly positioned Waters projection will show a symmetric skull image divided in half by the midsagittal plane and the petrous ridge of the temporal bone projected below the floor of the maxillary sinus.
Dental radiography involves taking images of the teeth, bones, and soft tissues in the mouth to aid in diagnosis and treatment planning. There are several types of dental radiography procedures, including intraoral radiographs like bitewings and periapicals, as well as panoramic and cephalometric images. Radiographs are useful for detecting issues like dental caries, abnormalities, and monitoring treatment. Proper radiation safety protocols must be followed when performing dental radiography to minimize risk to patients and staff.
The document discusses panoramic radiography, including:
- The focal trough is a curved zone where structures appear clearly on panoramic films.
- Panoramic machines rotate an x-ray tube and film cassette around the patient's head to produce a single image of the jaws.
- Positioning errors can produce artifacts that obscure anatomy, such as incorrect lip/tongue placement or improper Frankfort plane alignment. Precise patient positioning is important for diagnostic quality.
The document describes the composition and uses of intraoral and extraoral films and intensifying screens used in dental radiography. It discusses the components of intraoral and extraoral films, including the plastic base, double emulsion containing silver halide crystals, and protective layers. It also describes the composition and function of intensifying screens containing rare earth phosphor crystals that emit light when exposed to x-rays. The document provides details on different film types, speeds, sizes and storage as well as cassette, barrier packets and processing.
Specialized radiographic techniques include tomography, stereoscopy, scanography, computed tomography (CT), cone beam computed tomography (CBCT), magnetic resonance imaging (MRI), nuclear medicine techniques, and ultrasonography. CT provides cross-sectional images by using x-rays and rotational data acquisition. CBCT uses a cone-shaped beam and a 2D detector to obtain volumetric images with less radiation than medical CT. MRI uses magnetic fields and radiofrequency pulses to visualize soft tissues without exposing the patient to ionizing radiation.
This document provides an overview of dental radiographic techniques. It discusses the equipment used, types of dental radiographic films, dental anatomy terminology, and the main types of dental x-rays - bitewing and periapical. For bitewing x-rays, the document describes the positioning of the patient and film, and direction of the x-ray beam. For periapical x-rays, it discusses the bisecting angle and paralleling techniques. The document provides details on indications for different dental x-rays and advantages/disadvantages of film types.
Panoramic imaging, also called panoramic radiography or orthopantomography (OPG), produces a single tomographic image of the maxillary and mandibular dental arches and their supporting structures. It has several advantages, including broad coverage, low radiation dose, short examination time, and usefulness for patients who cannot open their mouth wide. Panoramic images are useful for evaluating trauma, detecting unerupted third molars, and assessing dental diseases, lesions, tooth development, and TMJ issues. Image quality can be affected by magnification, distortion, and overlapping structures. The diagnostic regions of a panoramic image are the maxillary region, mandibular region, dentoalveolar region,
This document discusses common artifacts and positioning errors seen on panoramic radiographs. It describes ghost images, which are duplicate images caused when an object is penetrated twice by x-rays. It also discusses errors like open lips obscuring teeth, improper positioning of the chin resulting in overlapping structures, and movement during exposure causing blurring or duplication. Positioning the patient correctly in relation to the focal trough and keeping the spine straight are important to avoid errors.
1. The document discusses various intra-oral radiographic techniques including the paralleling cone technique and bisecting angle technique.
2. The paralleling cone technique provides accurate images with little magnification and no superimposition but is more difficult for patients. The bisecting angle technique is easier for patients but results in more image distortion.
3. Special considerations for intra-oral radiography include techniques for mandibular third molars, gagging patients, endodontic procedures, edentulous ridges, and pediatric patients.
4. Digital radiography provides advantages like automated measurements and image manipulation but has higher initial costs and bulkier sensors.
This document provides an overview of panoramic radiography. It discusses the history and development of panoramic radiography, the principles behind it including image layer and rotation center, equipment used, procedures for taking panoramic x-rays, common errors, clinical indications, advantages, and limitations. Panoramic radiography allows visualization of all teeth and supporting structures on a single film with a relatively low radiation dose.
Dental x-rays help visualize parts of the teeth and jaws that cannot be seen normally. There are different types of intra-oral and extra-oral x-rays used for various purposes like detecting decay, evaluating bone quality, and examining the jaw and salivary glands. Modern digital x-ray systems offer advantages over conventional film x-rays like reduced radiation exposure and ability to enhance images electronically.
X-ray film is composed of several layers that allow it to capture x-ray images. The base layer is a clear, flexible material like cellulose triacetate or polyester that serves as a support. Coated on this is the emulsion, a light-sensitive layer containing silver halide crystals that darken when exposed to x-rays or light. An anti-halation layer reduces halo effects from light scattering. Together these layers allow x-ray film to record x-ray exposures and be developed into visible images.
The document summarizes the process of radiographic film processing and the darkroom equipment used. It discusses:
1. How a latent image is formed on the film when exposed to x-rays and the chemical components involved.
2. The steps of film processing - developing the latent image into a visible one using developer solutions, fixing the image using fixer, and washing the film.
3. The components and purpose of developer and fixer solutions, and factors like temperature, time and replenishment that are important in processing.
4. Darkroom requirements like safelighting, manual processing tanks, timers and drying racks used to process films.
This document discusses the key characteristics of dental x-ray images, including density, contrast, sharpness, magnification, and distortion. It defines radiolucent and radiopaque areas and explains how factors like kilovoltage, milliamperage, and exposure time influence the density of an image. The document also differentiates between high and low contrast images and describes short and long scale contrast. Finally, it identifies several geometric characteristics of dental x-rays and the factors that can influence sharpness, magnification, and distortion.
The document describes a panoramic anatomy presentation that identifies anatomical structures on panoramic radiographs. It includes slides labeling structures, describing different types of images (single real, double real, ghost), and providing an anatomical key. The slides provide examples of panoramic images labeling different structures and examples of positioning errors.
This document outlines six principles of dental radiography: 1) use the smallest possible X-ray source to reduce image blurriness, 2) maximize the distance between the X-ray source and object, 3) minimize the distance between the object and receptor, 4) keep the receptor and tooth parallel, 5) direct the X-ray beam perpendicular to the receptor, and 6) avoid movement during exposure to prevent penumbra formation and blurring. It also defines the three parts of a shadow - the umbra, penumbra, and antumbra.
Panoramic radiography, also known as dental panoramic tomography (DPT), produces a single image of the facial structures including both dental arches. It utilizes a technique called tomography, which produces radiographs of a thin section or slice of the patient. In panoramic radiography, the x-ray tube and film rotate synchronously around the patient's head within a focal trough, producing multiple images that are merged into a single panoramic view. This provides visualization of teeth and jaws while minimizing radiation exposure compared to full mouth x-rays. Exact patient positioning is important for obtaining diagnostic quality images.
This document provides information on the processing of dental radiographs, including definitions of key terms, the formation of latent images, film processing solutions and procedures, darkroom requirements, and various processing methods. It describes how exposure to radiation results in chemical changes in the film's silver halide crystals to form a latent image, which is then made visible through development and fixing solutions. The roles of developer solutions, fixing solutions, and processing equipment are summarized.
This document discusses collimation and filtration in dental x-rays. It explains that collimators are used to restrict the size of the x-ray beam in order to minimize radiation exposure and scattered radiation. There are different types of collimators including diaphragm, round, rectangular, and slit collimators. Filtration is also discussed, which involves removing low-energy photons from the beam to reduce unnecessary radiation exposure while maintaining diagnostic image quality. Common filtration materials mentioned are aluminum, copper, tin, and lead. The effects of proper collimation and filtration are to harden the beam and reduce radiation dose to patients.
CBCT stands for cone beam computed tomography. It is a 3D imaging technique that uses a cone-shaped X-ray beam to capture volumetric images of the teeth, jaws, and surrounding structures. CBCT provides more detailed views than conventional 2D X-rays and exposes patients to less radiation than traditional medical CT scans. It has various applications in dentistry, including implant planning, endodontics, surgery, and orthodontics by allowing visualization of hard tissues and their relationship to anatomical structures.
This document provides information on periapical radiography. It discusses the history and types of dental x-rays, including periapical radiographs. Periapical radiographs are used to detect abnormalities of the root structure and surrounding bone. The document outlines techniques for proper positioning during periapical radiography, including the paralleling technique and bisected angle technique. It also discusses advantages and disadvantages of each technique as well as indications for periapical radiography.
This document discusses common radiographic errors and artifacts that can occur during dental x-ray procedures. It identifies three main categories of errors: technique and projection errors, exposure errors, and processing errors. Technique errors include issues with patient preparation, film placement, and projection angles. Exposure errors result in over or underexposed images. Processing errors stem from chemical or film handling issues during development and fixing of the x-ray film. The document provides examples and explanations of specific errors like double images, cut-off areas, density problems, and chemical or physical marks that can affect image quality and interpretation.
The document discusses the proper positioning for a Waters projection x-ray exam, including tilting the patient's head upward at a 37 degree angle with the canthomeatal line perpendicular to the image receptor. The central x-ray beam should be perpendicular to and centered on the image receptor in the area of the maxillary sinuses. A properly positioned Waters projection will show a symmetric skull image divided in half by the midsagittal plane and the petrous ridge of the temporal bone projected below the floor of the maxillary sinus.
Dental radiography involves taking images of the teeth, bones, and soft tissues in the mouth to aid in diagnosis and treatment planning. There are several types of dental radiography procedures, including intraoral radiographs like bitewings and periapicals, as well as panoramic and cephalometric images. Radiographs are useful for detecting issues like dental caries, abnormalities, and monitoring treatment. Proper radiation safety protocols must be followed when performing dental radiography to minimize risk to patients and staff.
The document discusses panoramic radiography, including:
- The focal trough is a curved zone where structures appear clearly on panoramic films.
- Panoramic machines rotate an x-ray tube and film cassette around the patient's head to produce a single image of the jaws.
- Positioning errors can produce artifacts that obscure anatomy, such as incorrect lip/tongue placement or improper Frankfort plane alignment. Precise patient positioning is important for diagnostic quality.
The document describes the composition and uses of intraoral and extraoral films and intensifying screens used in dental radiography. It discusses the components of intraoral and extraoral films, including the plastic base, double emulsion containing silver halide crystals, and protective layers. It also describes the composition and function of intensifying screens containing rare earth phosphor crystals that emit light when exposed to x-rays. The document provides details on different film types, speeds, sizes and storage as well as cassette, barrier packets and processing.
Specialized radiographic techniques include tomography, stereoscopy, scanography, computed tomography (CT), cone beam computed tomography (CBCT), magnetic resonance imaging (MRI), nuclear medicine techniques, and ultrasonography. CT provides cross-sectional images by using x-rays and rotational data acquisition. CBCT uses a cone-shaped beam and a 2D detector to obtain volumetric images with less radiation than medical CT. MRI uses magnetic fields and radiofrequency pulses to visualize soft tissues without exposing the patient to ionizing radiation.
This document provides an overview of dental radiographic techniques. It discusses the equipment used, types of dental radiographic films, dental anatomy terminology, and the main types of dental x-rays - bitewing and periapical. For bitewing x-rays, the document describes the positioning of the patient and film, and direction of the x-ray beam. For periapical x-rays, it discusses the bisecting angle and paralleling techniques. The document provides details on indications for different dental x-rays and advantages/disadvantages of film types.
Panoramic imaging, also called panoramic radiography or orthopantomography (OPG), produces a single tomographic image of the maxillary and mandibular dental arches and their supporting structures. It has several advantages, including broad coverage, low radiation dose, short examination time, and usefulness for patients who cannot open their mouth wide. Panoramic images are useful for evaluating trauma, detecting unerupted third molars, and assessing dental diseases, lesions, tooth development, and TMJ issues. Image quality can be affected by magnification, distortion, and overlapping structures. The diagnostic regions of a panoramic image are the maxillary region, mandibular region, dentoalveolar region,
This document discusses common artifacts and positioning errors seen on panoramic radiographs. It describes ghost images, which are duplicate images caused when an object is penetrated twice by x-rays. It also discusses errors like open lips obscuring teeth, improper positioning of the chin resulting in overlapping structures, and movement during exposure causing blurring or duplication. Positioning the patient correctly in relation to the focal trough and keeping the spine straight are important to avoid errors.
1. The document discusses various intra-oral radiographic techniques including the paralleling cone technique and bisecting angle technique.
2. The paralleling cone technique provides accurate images with little magnification and no superimposition but is more difficult for patients. The bisecting angle technique is easier for patients but results in more image distortion.
3. Special considerations for intra-oral radiography include techniques for mandibular third molars, gagging patients, endodontic procedures, edentulous ridges, and pediatric patients.
4. Digital radiography provides advantages like automated measurements and image manipulation but has higher initial costs and bulkier sensors.
This document provides an overview of panoramic radiography. It discusses the history and development of panoramic radiography, the principles behind it including image layer and rotation center, equipment used, procedures for taking panoramic x-rays, common errors, clinical indications, advantages, and limitations. Panoramic radiography allows visualization of all teeth and supporting structures on a single film with a relatively low radiation dose.
Dental x-rays help visualize parts of the teeth and jaws that cannot be seen normally. There are different types of intra-oral and extra-oral x-rays used for various purposes like detecting decay, evaluating bone quality, and examining the jaw and salivary glands. Modern digital x-ray systems offer advantages over conventional film x-rays like reduced radiation exposure and ability to enhance images electronically.
X-ray film is composed of several layers that allow it to capture x-ray images. The base layer is a clear, flexible material like cellulose triacetate or polyester that serves as a support. Coated on this is the emulsion, a light-sensitive layer containing silver halide crystals that darken when exposed to x-rays or light. An anti-halation layer reduces halo effects from light scattering. Together these layers allow x-ray film to record x-ray exposures and be developed into visible images.
The document summarizes the process of radiographic film processing and the darkroom equipment used. It discusses:
1. How a latent image is formed on the film when exposed to x-rays and the chemical components involved.
2. The steps of film processing - developing the latent image into a visible one using developer solutions, fixing the image using fixer, and washing the film.
3. The components and purpose of developer and fixer solutions, and factors like temperature, time and replenishment that are important in processing.
4. Darkroom requirements like safelighting, manual processing tanks, timers and drying racks used to process films.
This document discusses the key characteristics of dental x-ray images, including density, contrast, sharpness, magnification, and distortion. It defines radiolucent and radiopaque areas and explains how factors like kilovoltage, milliamperage, and exposure time influence the density of an image. The document also differentiates between high and low contrast images and describes short and long scale contrast. Finally, it identifies several geometric characteristics of dental x-rays and the factors that can influence sharpness, magnification, and distortion.
The document describes a panoramic anatomy presentation that identifies anatomical structures on panoramic radiographs. It includes slides labeling structures, describing different types of images (single real, double real, ghost), and providing an anatomical key. The slides provide examples of panoramic images labeling different structures and examples of positioning errors.
This document outlines six principles of dental radiography: 1) use the smallest possible X-ray source to reduce image blurriness, 2) maximize the distance between the X-ray source and object, 3) minimize the distance between the object and receptor, 4) keep the receptor and tooth parallel, 5) direct the X-ray beam perpendicular to the receptor, and 6) avoid movement during exposure to prevent penumbra formation and blurring. It also defines the three parts of a shadow - the umbra, penumbra, and antumbra.
Lecture xiii ju-oral pathology-lecture xiii-perio5lalola
This document discusses non-plaque induced gingival lesions. It covers 7 categories: 1) diseases of specific bacterial origin like streptococcal infections and syphilis. 2) Viral diseases like herpes and HPV. 3) Fungal infections like candidiasis. 4) Genetic conditions like gingival fibromatosis. 5) Systemic conditions that manifest in the gingiva, such as lichen planus, pemphigoid, and pemphigus vulgaris. 6) Traumatic lesions caused by chemicals, physical factors, or thermal injury. 7) Other conditions including vascular and epithelial neoplasms and granulomatous diseases. Numerous visual examples are provided to illustrate the
Sciography of objects (shade & shadow)Ar. Aakansha
A study of shades and shadows cast by simple architectural forms on plain surfaces.
Sciography is a branch of science of the perspective dealing with the projection of shadows, or delineation of an object in
perspective with its gradations of light and shade.
The document identifies common errors that can occur when taking panoramic dental x-rays. These include the teeth being positioned too far anterior or posterior to the focal trough, the patient's head being turned or tipped in various directions, issues with the placement of the lead apron, and other errors like patient movement, double exposures, or using incorrect exposure settings. Proper patient positioning and technique are necessary to avoid these errors and ensure diagnostic quality panoramic dental x-rays.
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2. IntroductionIntroduction
• Peculiarities of the panoramic
system result in a unique projection
of many anatomical structures in the
image.
• Produces several unusual
anatomical relationships that are not
found in any other kind of
radiographic projection.
(Langland)
3. IntroductionIntroduction
• Most of the peculiarities of normal
structural relationships can be
explained by one or more of the
following eight concepts.
(Langland)
4. Imaging ConceptsImaging Concepts
• Structures adjacent to tooth-bearing areas are
visualized
• Structures are flattened and spread out
• Midline structures may project as single or double
Images
• Ghost images are formed
• Soft tissue shadows are seen
• Air spaces are seen
• Radiolucencies and radiopacities are seen
• Panoramic images are unique
(Langland)
5. Concept 1:Concept 1:
Structures Adjacent toStructures Adjacent to
Tooth-Bearing Areas areTooth-Bearing Areas are
VisualizedVisualized
• Rims of orbits
• Infraorbital canal and foramen
• Pterygomaxillary fissure
• Borders of maxillary sinus
• Zygomatic arch
• Nasal fossae
6. Concept 1:Concept 1:
Structures Adjacent toStructures Adjacent to
Tooth-Bearing Areas areTooth-Bearing Areas are
VisualizedVisualized
• Ramus, body & lower border
of mandible
• TMJ structures: glenoid fossa,
articular eminence, condyle
• Styloid process
• Hyoid bone & Hard palate
7. Concept 1:Concept 1:
Structures Adjacent toStructures Adjacent to
Tooth-Bearing Areas areTooth-Bearing Areas are
VisualizedVisualized
8. Concept 2:Concept 2:
Structures are Flattened andStructures are Flattened and
Spread OutSpread Out
• The jaws and structures of the
of the maxillofacial complex as
well as the spine are portrayed
as if they were split vertically
in half down the midsagittal
plane with each half folded
outward.
(Langland)
9. Concept 2:Concept 2:
Structures are Flattened andStructures are Flattened and
Spread OutSpread Out
• Radiographic image is “laid
out” on the film, the same way
paint is applied to a wall with a
roller.
(Langland)
10. Concept 2:Concept 2:
Structures are Flattened andStructures are Flattened and
Spread OutSpread Out
• Resultant Image:
– Nose remains in the middle
– Right and left sides of the jaws are on
each side of the film
– The spine (having been split in half)
appears beyond the rami at the
extreme right and left edges of the
film.
(Langland)
12. Concept 2:Concept 2:
Structures are Flattened andStructures are Flattened and
Spread OutSpread Out
• Acceptable for
– structures visualized within the
same plane as the film,
– and without superimposition of
right and left sides of hard tissue
(zygomatic arch, mandible)
(Langland)
13. Concept 2:Concept 2:
Structures are Flattened andStructures are Flattened and
Spread OutSpread Out
• Undesirable in some areas
because spread out structures
obscure other structures
• Examples:
– Nasal conchae/fossae projected
across maxillary sinus (client back)
– Hyoid spread across mandible (chin
tipped too low) (Langland)
14. Concept 2:Concept 2:
Structures are Flattened andStructures are Flattened and
Spread OutSpread Out
Correct projection of
nasal turbinates
Nasal turbinates spread
out across sinus due to
patient positioning error(Langland)
15. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
• Real image formation:
–Single
–Double
(Langland)
16. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
• A single, real image is formed when
anatomical structure located
between rotation center and film
(object in front of rotation center)
such as anterior teeth, nasal septum,
incisive foramen.
(Langland)
17. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
(Langland)
18. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
• Some midline structures fall within
the focal trough twice; beam
intercepts these objects twice due to
machine rotation (cervical spine,
hard palate, hyoid bone, palatal
torus, epiglottis).
(Langland)
19. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
• A double real image is a pair of real
images formed by objects located in
the central portion of the oral &
maxillofacial region.
• Double images are mirror images of
each other.
(Langland)
20. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
(Langland)
21. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
Vertical
hatch
marks =
real image
formation
Double real
images
formed in
central
diamond-
shaped
region
(Langland)
22. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
A = Formation of
first image
B = Formation
of second
image
(Langland)
23. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
• Structures that normally produce
double real images: hard/soft palate,
palatal torus, body of hyoid bone,
epiglottis, cervical spine
• Malpositioning of client produces
undesirable double images:nose
turbinates, body of hyoid, spine
(Langland)
24. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
Hard Palate
Hyoid bone
(Langland)
25. Concept 3:Concept 3:
Midline Structures MayMidline Structures May
Project as Single or DoubleProject as Single or Double
ImagesImages
Five Characteristics of Double ImagesFive Characteristics of Double Images
– One image is the mirror image of the other
– Both images are real
– Each image will have the same proportions
– Each image will have the same location on
the opposite side
– Double images only occur with midline
structures falling in diamond-shaped zone
in the midline (Langland)
26. Concept 4:Concept 4:
Ghost Images are FormedGhost Images are Formed
• Formed when object located between xray
source and center of rotation (Anatomically
the object is behind the rotation center)
(Langland)
27. Concept 4:Concept 4:
Ghost Images are FormedGhost Images are Formed
Horizontal
hatch marks
represent the
region where
ghost images
form
(Langland)
29. Concept 4:Concept 4:
Ghost Images are FormedGhost Images are Formed
• Midline structures seen at the
posterior limits of the image tend to
be ghosted onto the central portion
of the radiograph (cervical spine,
neckchains, lead apron)
(Langland)
30. Concept 4:Concept 4:
Ghost Images are FormedGhost Images are Formed
• Lateral structures seen at the
posterior limits of the image ghosted
onto contralateral side of the image
(inferior border of mandible, ramus,
hard palate, nasal conchae, earrings)
(Langland)
31. Concept 4:Concept 4:
Ghost Images are FormedGhost Images are Formed
• Six characteristics of Ghost images...
– has the same general shape as its real
counterpart
– appears on the opposite side of the
radiograph from its real counterpart
– appears higher on the radiograph than
its real counterpart
(Langland)
32. Concept 4:Concept 4:
Ghost Images are FormedGhost Images are Formed
• The ghost image...
– is more blurred than its real counterpart
– the vertical component of the ghost is
more blurred than the horizontal
– vertical component of the ghost is
always larger than its real counterpart
• Ghosts usually result of technique
errors (earrings, necklaces, spine
etc.)(Langland)
33. Summary of Single & DoubleSummary of Single & Double
Real Images & Ghost ImagesReal Images & Ghost Images
Hatch marks:
Vertical = Real images
Horizontal = Ghost images
Both = Single real &
ghost
Diamond = Double real &
ghost
(Langland)
34. Summary of Single & DoubleSummary of Single & Double
Real Images & Ghost ImagesReal Images & Ghost Images
1=Real single images of centrals, 2=Real single1=Real single images of centrals, 2=Real single
image of nasal septum, 3=Real single image of softimage of nasal septum, 3=Real single image of soft
tissue outline of nose, 5=Double real image of hyoid,tissue outline of nose, 5=Double real image of hyoid,
6=Double real image of spine, 7=Double real images6=Double real image of spine, 7=Double real images
of palate, 8=Ghost image of palateof palate, 8=Ghost image of palate
35. Concept 5:Concept 5:
Soft Tissue Shadows areSoft Tissue Shadows are
SeenSeen
• Soft tissues are outlined: nasolabial
fold, soft palate, ear lobes, tongue
lips, nose, epiglottis, uvula, dorsum
of tongue, posterior pharyngeal wall,
palatine tonsil, soft tissues of nasal
turbinates and septum, gingiva,
retromolar pad & operculums.
(Langland)
36. Concept 5:Concept 5:
Soft Tissue Shadows areSoft Tissue Shadows are
SeenSeen
• Visualization of the tongue, ears,
nose and nasal turbinates spread-out
are indications of technique errors.
(Langland)
38. Concept 6:Concept 6:
Air Spaces are SeenAir Spaces are Seen
• Appear black
• Include: external auditory meatus,
nasopharynx, oropharynx,
laryngopharynx, palatoglossal,
maxillary sinus, nasal fossa
• Air space appearing above dorsum of
tongue or anterior teeth is a technique
error(Langland)
39. Concept 6:Concept 6: Air Spaces areAir Spaces are
SeenSeen
11=Nares, 2=Glossopalatine air space, 3= Soft=Nares, 2=Glossopalatine air space, 3= Soft
palate, 4=Nasopharyngeal air spacepalate, 4=Nasopharyngeal air space
5=Oropharyngeal air space5=Oropharyngeal air space
(Lang
land)
40. Concept 6:Concept 6: Air Spaces areAir Spaces are
SeenSeen
1=Nares, 2=Glossopalatine air space, 3=Soft1=Nares, 2=Glossopalatine air space, 3=Soft
palate, 4=Nasophyaryngeal air space,palate, 4=Nasophyaryngeal air space,
5=Oropharyngeal air space, 6=Maxillary sinus,5=Oropharyngeal air space, 6=Maxillary sinus,
7=Inferior meatus, 8=Common meatus, 9=Middle7=Inferior meatus, 8=Common meatus, 9=Middle
meatus
(Langl
41. Concept 7:Concept 7: RelativeRelative
Radiolucencies &Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
• Need to separate shadows originating
from parts of machine from those
coming from the client.
– Machine parts are plastic with density
similar to soft tissue
– Easy to identify due to geometric/linear
configuration
(Langland)
42. Concept 7:Concept 7: RelativeRelative
Radiolucencies &Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
• All machine & client components
(hard tissue, soft tissue & air) may
produce single and/or double real
images and ghost images.
• Thus, multiple areas consisting of
relative density changes are
produced.(Langland)
43. Concept 7:Concept 7: RelativeRelative
Radiolucencies &Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
• Effects of Density Changes onEffects of Density Changes on
Panoramic RadiographsPanoramic Radiographs
– Air obscures hard tissues
– Soft tissue obscures air
– Hard tissue obscures soft tissue
– Ghost images obscure everything
(Langland)
44. Concept 7:Concept 7: RelativeRelative
Radiolucencies &Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
1=Air obscures hard tissue(ramus), 2=Soft tissue (soft palate)1=Air obscures hard tissue(ramus), 2=Soft tissue (soft palate)
obscures air space (pharyngeal air space), 3=hard tissueobscures air space (pharyngeal air space), 3=hard tissue
(tooth) obscures soft tissue(soft palate), 4=ghost images(tooth) obscures soft tissue(soft palate), 4=ghost images
(markers, spinal column, hard palate) obscure everything(markers, spinal column, hard palate) obscure everything
(hyoid, mandible & sinus), 6=machine components(hyoid, mandible & sinus), 6=machine components (Lang
45. Concept 7:Concept 7:
Relative Radiolucencies &Relative Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
1=Air obscures hard tissue/ramus; 2=Soft tissue/soft1=Air obscures hard tissue/ramus; 2=Soft tissue/soft
palate obscures air/pharyngeal air space, 3=hardpalate obscures air/pharyngeal air space, 3=hard
tissue/tooth obscures soft tissue/soft palate, 4=ghosttissue/tooth obscures soft tissue/soft palate, 4=ghost
images/markers-spinal column-hard palate obscureimages/markers-spinal column-hard palate obscure
(Lang
46. Concept 7:Concept 7:
Relative Radiolucencies &Relative Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
• If pathology is present it will consist
of hard tissue, soft tissue or fluid
and it will affect one or more of the
three tissue components in various
ways.
(Langland)
47. Concept 7:Concept 7:
Relative Radiolucencies &Relative Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
• Effects of Disease On Density of
Panoramic Radiographs:
Disease producing hard tissue cause all
three client components (hard tissue, soft
tissue & fluid) to become relatively more
radiopaque in the region of the disorder.
(Langland)
48. Concept 7:Concept 7:
Relative Radiolucencies &Relative Radiolucencies &
Radiopacities are SeenRadiopacities are Seen
• Effects of Disease On Density of
Panoramic Radiographs:
A soft tissue pathologic condition within the
mineralized component causes it to become more
radiolucent, whereas the soft tissue and air
components become more radiopaque when a
soft tissue disorder is present. Ex: soft tissue
lesion in an air space such as the sinus results in
a visible opacity superimposed on the air space.
(Langland)
49. Concept 8: PanoramicConcept 8: Panoramic
Radiographs are UniqueRadiographs are Unique
• Scope of assessment & interpretive
potential exceeds that of CIS:
– Relationship of teeth can be studied (crown &
bridge, ortho, third molars)
– Jaws can be studied: ramus, styloid process,
tmj, sinus
– Excellent for clients with trimus or trauma
(Langland)
50. Concept 8: PanoramicConcept 8: Panoramic
Radiographs are UniqueRadiographs are Unique
• Excellent projection of a variety of
structures on single film which no
other imaging system can achieve.
Editor's Notes
When nasal conchae and nasal fossae lie within the focal trough, thick radiopaque bands bounded by thin radiolucent lines are spread across the maxillary sinus space. These “spread out” structures may obliterate pathological changes or be misinterpreted. This occurs when the client is positioned improperly. Chin tipped too low: Hyoid bone spread out and projected across the mandible Client positioned too far back: Inferior turbinates and meati of nose are spread out and projected across the maxillary sinus
The diamond-shaped region corresponds to the client’s midline from about the middle of the image to the most posterior extend of the radiograph. Only midline structures located in the diamond-shaped area can produce double real images. If client is malpositioned then the turbinates, body of hyoid & spine enter into the diamond shaped area.
The diamond-shaped region corresponds to the client’s midline from about the middle of the image to the most posterior extend of the radiograph. Only midline structures located in the diamond-shaped area can produce double real images. If client is malpositioned then the turbinates, body of hyoid & spine enter into the diamond shaped area.
The diamond-shaped region corresponds to the client’s midline from about the middle of the image to the most posterior extend of the radiograph. Only midline structures located in the diamond-shaped area can produce double real images. If client is malpositioned then the turbinates, body of hyoid & spine enter into the diamond shaped area.