Ultrasound Physics Questions and Answers 2023
gain
- "amplification"
- ratio of output/input
- increases or decreases the echodensity or "brightness" equally throughout the image
focal zone
area in which the image detail is the best
output power
- electrical power to the transdu...
Ultrasound Physics Questions and Answers 2023
gain - answer - "amplification" - ratio of output/input
- increases or decreases the echodensity or "brightness" equally throughout the image
focal zone - answer area in which the image detail is the best
output power - answer - electrical power to the transducer - has the same "apparent" effect on the image as increasing the overall gain
- exposes patient to higher level of ultrasound energy
golden rule of output power - answer - when an INCREASE in image brightness is desired first increase the GAIN control - when a DECREASE in image brightness is desired, first decrease the OUTPUT POWER
time gain compensation - answer selective amplification of echoes as a function of time (depth) to compensate for the effect of attenuation
attenuation - answer - weakening of the sound beam as it passes through tissue, due to absorption and scattering of the ultrasound energy - Increase Frequency = Increase Attenuation
transducer frequency - answer - increase frequency = increase attenuation = decrease penetration = improved resolution - decrease frequency = decrease attenuation = increase penetration = decreased resolution
time gain compensation - answer y-axis = gain (amplification)
x-axis = time (depth)
through transmission - answer - an artifact resulting from over-amplification of echoes from structures located deep to a fluid-filled (non-attenuation) organ or structure
- posterior enhancement
cystic - answer - a structure that is predominantly fluid-filled in composition - may contain internal echoes
- may (not) be anechoic
- through transmission
cyst - answer - a structure that is fluid-filled and meets specific criteria - anechoic
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