Ultrasound System Controls and Knobology Flashcards
6 cards from real ARDMS SPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Ultrasound System Controls and Knobology flashcards as text
Which control adjusts the amplification of returning ultrasound signals uniformly across all depths?
Answer: Overall gain
Overall gain amplifies all returning signals equally regardless of depth.
Time gain compensation (TGC) is used to correct for which phenomenon?
Answer: Attenuation with depth
TGC applies increasing amplification to deeper echoes to compensate for attenuation as sound travels through tissue.
Increasing the depth setting on an ultrasound system will have what effect on frame rate?
Answer: Frame rate decreases
Increasing depth requires longer pulse travel time, reducing the number of frames that can be acquired per second.
The pulse repetition frequency (PRF) setting directly affects which Doppler parameter?
Answer: Maximum detectable velocity (Nyquist limit)
The Nyquist limit is equal to PRF/2, so increasing PRF raises the maximum velocity that can be displayed without aliasing.
What does the wall filter (high-pass filter) in Doppler mode eliminate?
Answer: Low-frequency signals from slow-moving vessel walls
The wall filter removes low-frequency, high-amplitude signals generated by slow-moving vessel walls and surrounding tissue.
Which control is adjusted to change the size of the color Doppler sample box?
Answer: Color box size/region of interest
The color box size or region of interest control determines the area over which color Doppler information is displayed, directly affecting frame rate.