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Spect technology

Spect technology






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    Spect technology Spect technology Presentation Transcript

    • INTRODUCTION Emission Computed Tomography is a technique where by multi cross sectional images of tissue function can be produced The technique of SPECT is generally considered as two separate modalities.SINGLE PHOTON Emission Computed Tomography involves the use single gamma ray emitted per nuclear disintegration. Positron Emission Tomography makes use of radio isotopes such as gallium-68, when two gamma rays each of 511KeV, are emitted simultaneously.
    • SPECT What is SPECT? SPECT is short for single photon emission computed tomography. As its name suggests (single photon emission) gamma rays are the sources of the information rather than X-ray emission in the conventional CT scan. Why SPECT? Similar to X-ray, CT, MRI, etc SPECT allows us to visualize functional information about patient’s specific organ or body system.
    • THEORY AND INSTRUMENTATION SPECT is a technology used in nuclear medicine where the patient is injected with a radiopharmaceutical which will emit gamma rays. We seek the position and concentration of radionuclide distribution by the rotation of a photon detector array around the body which acquires data from multiple angles.
    • CONT… Each of the cameras collects a matrix of values which correspond to the number of gamma counts detected in that direction at the one angle. Images can be reprojected into a three dimensional one that can be viewed in a dynamic rotating format on computer monitors, facilitating the demonstration of pertinent findings to the referring physicians
    • GAMMA CAMERA The instrument used in nuclear medicine for the detection of gamma rays is known as gamma Camera The components making up the gamma camera are 1. Camera Collimator 2. Scintillation Detector 3. Photomultiplier Tube 4. Positron Circuitry 5. Data Analysis Computer
    • Cont… 2. Improvement in these parameters is a constant goal of the SPECT researcher. Improvement in both of these parameters simultaneously is rarely achieved in practice. Collimation Computers in radiology and nuclear medicine Image acquisition
    • ADVANTAGES Localization of defects is more precise and more clearly seen by the inexperienced eye. Extend and size of defects is better defined. Images free of background.
    • SPECT APPLICATIONS Heart imaging Brain Imaging SPECT imaging Tumor detection Bone Scans
    • POSITRON EMISSION TOMOGRAPHY In the simplest PET camera two modified sophisticated cameras called Anger cameras are placed on opposite sides of the patient. This increases the collection angle and reduces the collection times which are the limitations of SPECT In PET, radiopharmaceuticals are labeled with positron emitting isotopes.
    • COMPARISON OF PET AND SPECT  SPECT imaging is inferior to PET because of attainable resolution and sensitivity. Different radionuclide is used for SPECT imaging that emits a single photon rather than positron emission as in PET.  The use of collimator results in a tremendous decrease in the detection efficiency as compared to PET.
    • CONCLUSION SPECT being a nuclear medicine imaging modality , it has all the advantages and disadvantages of nuclear medicine can be highly beneficial or dangerous on the application , so is SPECT . In spite of this , Today , nearly all cardiac patients receive a planar ECT or SPECT as part of their work- up to detect and stage coronary artery disease.