Exam (elaborations)

Ultrasound Physics Questions And Well Answered Graded A+

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Module
Ultrasound Physics

Institution
Ultrasound Physics

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Uploaded on April 4, 2024
Number of pages 3
Written in 2023/2024
Type Exam (elaborations)
Contains Questions & answers

ultrasound physics
focal zone
output power
time gain compensation
attenuation
gain answer amplification
golden rule of output power

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Ultrasound Physics
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
- smooth, regular walls of uniform thickness
- through transmission

components of an ultrasound scanner - Answer-transducer -->
pulser / receiver (100,000 echo amplitudes) -->
system memory (256 storage "bins") -->
display (256 grey shades)

preprocessing controls - Answer-- controls that affect the data before it is stored in the system memory
- Ex:
- Scale size, Overall Gain, TGC, Dynamic Range, "Write Zoom", Transmit Frequency, Preset Control

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Exam (elaborations)

Ultrasound Physics Questions And Well Answered Graded A+

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