The document discusses key concepts in ultrasound physics including:
1. Higher ultrasound frequency results in shorter wavelength and better resolution, while lower frequency has longer wavelength. The speed that ultrasound travels is determined by the medium and remains constant regardless of frequency.
2. Temporal resolution is improved with low line density images, as they use fewer pulses per frame, while spatial resolution is better with high line density images that use more pulses.
3. An ultrasound transducer transmits sound waves into the body and receives echoes to create images, with frequency inversely related to depth of penetration but directly related to resolution.
Definition of Side lobes and the principle behind its production during ultrasound imaging. Side lobes artifact and its result on image. Explanation of harmonic imaging, its production and the techniques use to eliminate fundamental frequency to produce optimal harmonic images.
Definition of Side lobes and the principle behind its production during ultrasound imaging. Side lobes artifact and its result on image. Explanation of harmonic imaging, its production and the techniques use to eliminate fundamental frequency to produce optimal harmonic images.
Basavarajeeyam is an important text for ayurvedic physician belonging to andhra pradehs. It is a popular compendium in various parts of our country as well as in andhra pradesh. The content of the text was presented in sanskrit and telugu language (Bilingual). One of the most famous book in ayurvedic pharmaceutics and therapeutics. This book contains 25 chapters called as prakaranas. Many rasaoushadis were explained, pioneer of dhatu druti, nadi pareeksha, mutra pareeksha etc. Belongs to the period of 15-16 century. New diseases like upadamsha, phiranga rogas are explained.
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Integrating Ayurveda into Parkinson’s Management: A Holistic ApproachAyurveda ForAll
Explore the benefits of combining Ayurveda with conventional Parkinson's treatments. Learn how a holistic approach can manage symptoms, enhance well-being, and balance body energies. Discover the steps to safely integrate Ayurvedic practices into your Parkinson’s care plan, including expert guidance on diet, herbal remedies, and lifestyle modifications.
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Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Local Advanced Lung Cancer: Artificial Intelligence, Synergetics, Complex Sys...Oleg Kshivets
Overall life span (LS) was 1671.7±1721.6 days and cumulative 5YS reached 62.4%, 10 years – 50.4%, 20 years – 44.6%. 94 LCP lived more than 5 years without cancer (LS=2958.6±1723.6 days), 22 – more than 10 years (LS=5571±1841.8 days). 67 LCP died because of LC (LS=471.9±344 days). AT significantly improved 5YS (68% vs. 53.7%) (P=0.028 by log-rank test). Cox modeling displayed that 5YS of LCP significantly depended on: N0-N12, T3-4, blood cell circuit, cell ratio factors (ratio between cancer cells-CC and blood cells subpopulations), LC cell dynamics, recalcification time, heparin tolerance, prothrombin index, protein, AT, procedure type (P=0.000-0.031). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and N0-12 (rank=1), thrombocytes/CC (rank=2), segmented neutrophils/CC (3), eosinophils/CC (4), erythrocytes/CC (5), healthy cells/CC (6), lymphocytes/CC (7), stick neutrophils/CC (8), leucocytes/CC (9), monocytes/CC (10). Correct prediction of 5YS was 100% by neural networks computing (error=0.000; area under ROC curve=1.0).
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
NYSORA Guideline
2 Case Reports of Gastric Ultrasound
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
1. US Physics (9)
Dr. Kamal Sayed MSc US UAA
range equation/scan lines/resolution
2. •
What is ultrasound range formula?
•
Range equation – since ultrasound systems measure the time
of flight and the average speed of ultrasound in soft tissue is
known (1540 m/s), then we can calculate the distance of the
object location. Distance to boundary (mm) = go-return time
(microsecond) x speed
3. •
Higher frequency means shorter wavelength
•
Lower frequency also means longer wavelength.
•
In soft tissue, sound with a frequency of 1MHz has a
•
wavelength of 1.54mm.
•
Rule In soft tissue, divide 1.54mm by the frequency in MHz.
•
Wavelength (mm) = 1.54 / frequency (MHz)
•
See slide (4)
5. •
Propagation Speed
•
Is defined as the rate that sound travels through a medium.
•
Units meters per second, mm/micros
•
Determined By Medium only (Density and stiffness)
•
Typical medical diagnostic US values : Average speed of all
sound (regardless of frequency) in
•
biologic or “soft tissue:”
•
1.54km/s = 1,540m/s = 1.54mm/micros
•
See slide (6 )
•
6.
7. •
Rule of Thumbs
•
Density is related to weight, Stiffness is related to
‘squishability’
•
Density and Speed — opposite directions
•
Stiffness and Speed — same direction
•
General Rule: gas (slower) < liquid < solid (faster)
•
= frequency (Hz) x wavelength (meters)
Equation: speed m/s
8. •
All sound, regardless of the frequency, travels at the same
•
speed through any specific medium.
•
This means that
•
sound with a frequency of 5MHz and sound with a
•
frequency of 3MHz travel at the same propagation speed
•
if they are traveling through the same medium.
9. •
•
(period & frequency) determined by sound source + inversly
related to each other
•
(amplitude & power & intensity) determined by sound
source + directly related to each other
•
wavelength (determined by both sound source & medium)
•
Speed is determined by medium
•
See slides (10/11)
•
10. (period & frequency) determined by sound source + inversly related to each other
(amplitude & power & intensity) determined by sound source + directly related to each other
12. •
Probe position to measue Gestational sac
•
Gestational sac - (GS) size formed initially by the chorionic
cavity, after the embryonic period (week 8, GA W10) the
amniotic cavity expands and fuses with the chorion.
Measured by mean gestation sac diameter.
•
Where do you place the ultrasound transducer?
•
For reliable FHR measurements it is required that the fetal
heart is located within the US beam. In clinical practice,
clinicians palpate the maternal abdomen to identify the fetal
presentation and then the US TXR is fixated on the maternal
abdomen where the best FHR signal can be obtained.
13. •
lateral resolution is defined as the ability of the system to
distinguish two points in the direction perpendicular to the
direction of the ultrasound beam.
•
Elevational (azimuthal) resolution represents the extent to
which an ultrasound system is able to resolve objects within
an axis perpendicular to the plane formed by the axial and
lateral dimensions.
•
Temporal resolution is the time from the beginning of one
frame to the next; it represents the ability of the US system to
distinguish between instantaneous events of rapidly moving
structures, for example, during the cardiac cycle.
14. •
Axial (also called longitudinal) resolution is the minimum
distance that can be differentiated between two reflectors
located parallel to the direction of ultrasound beam.
Mathematically, it is equal to half the spatial pulse
length. Axial resolution is high when the spatial pulse length is
short.
•
Axial resolution is generally around four times better than
lateral resolution. Axial resolution is defined by the
equation: axial resolution = ½ ⨉ spatial pulse length. The
spatial pulse length is determined by the wavelength of the
beam and the number of cycles (periods) within a pulse.
15. •
Diagnostic ultrasound TXR often have
better axial resolution than lateral resolution, although the
two may be comparable in the focal region if strongly focused.
•
spatial resolution refers to the number of pixels utilized in
construction of the image.
•
Images having higher spatial resolution are composed with a
greater number of pixels than those of lower spatial
resolution.
•
16. •
Spatial resolution influences how sharply we
see objects. The key parameter is not simply
the number of pixels in each row or column of
the display, but the angle subtended, , by each
of these pixels on the viewer's retina.
17. •
An ultrasound transducer, also called a probe, is a device that
produces sound waves that bounce off body tissues and make
echoes. The TXR also receives the echoes and sends them to a
computer that uses them to create an image called sonogram.
•
TXR frequency is inversely proportional to depth of
penetration of the ultrasound signal into the body and
directly proportional to image resolution. The
common transducer frequencies for pelvic imaging range
from 3.5 to 7.5 MHz
18. •
Focusing
•
Results in: 1. a narrower “waist” in the US beam.
•
2. a decrease in focal depth (the focus is shallower).
•
3. a reduction in the size of the focal zone.
•
Effective mainly in the near field and the focal zone.
•
Electronic Focusing Phased array technology provides
dynamic, variable (adjustable)focusing or multifocusing
•
19. •
Scan line & line density
•
Scan line allows the ultrasound transducer to see from
multiple lines of site at different angles, as opposed to the
standard line-of-site that's perpendicular to the transducer
lens. Slide (20)
•
Line density in a sector image is the number of scan lines per
•
degree of sector.
•
Line density in a rectangular image is the number of scan lines
per centimeter.
•
When the line density is low, temporal resolution is high.
•
20.
21. •
Traditionally, transducers send ultrasound signals in a single
“line of sight.”
•
This means it sends a sound signal perpendicular to the probe
head, then listens for the echo.
•
With compound imaging, the ultrasound sends signals at
multiple angles, allowing it to “see” tissue from multiple
angles and eliminate artifact.
•
The following image best represents what’s really happening
•
Slide (42)
22. •
Traditionally, transducers send ultrasound signals in a single
“line of sight.”
•
This means it sends a sound signal perpendicular to the probe
head, then listens for the echo.
•
With compound imaging, the ultrasound sends signals at
multiple angles, allowing it to “see” tissue from multiple
angles and eliminate artifact.
•
The following image best represents what’s really happening
•
Slide (23)
23. (a) Ultrasound scan lines. (b) A scan line in the ultrasound image. (c)
Intensity signal along the scan line.
24. •
With regard to line density, what will create a frame with
•
fewer pulses?
•
Low line density images use fewer pulses, and have
•
better temporal resolution. But, low line density degrades
•
spatial resolution (also called detail resolution.)
•
Slides (25/26/27/28)
25. Low Line Density – fewer pulses
Higher frame rate
Better temporal resolution
26. High Line Density – more pulses
Lower frame rate
Worse temporal resolution
27.
28.
29. summary
•
High Temporal Resolution Low Temporal Resolution
•
high frame rate low frame rate
•
Shallow deep
•
fewer pulses per image more pulses per image
•
single focusing multi-focusing
•
narrow sector wide sector
•
low line density high line density
•
associated with better movie,
•
but lower quality image
•
associated with poor quality movie,
•
but higher quality image
30. •
Low Line Density = fewer pulses + higher FR + better
temporal resolution
•
•
***************
•
High Line Density = more pulses + lower FR + worse temporal
resolution
•
Slide (31)
•