ARDMS SPI Ultrasound System Controls and Knobology

Question 1

Which control adjusts the amplification of returning ultrasound signals uniformly across all depths?

Accepted Answer

Overall gain

Answer

Overall gain amplifies all returning signals equally regardless of depth.

Question 2

Time gain compensation (TGC) is used to correct for which phenomenon?

Accepted Answer

Attenuation with depth

Answer

TGC applies increasing amplification to deeper echoes to compensate for attenuation as sound travels through tissue.

Question 3

Increasing the depth setting on an ultrasound system will have what effect on frame rate?

Accepted Answer

Frame rate decreases

Answer

Increasing depth requires longer pulse travel time, reducing the number of frames that can be acquired per second.

Question 4

The pulse repetition frequency (PRF) setting directly affects which Doppler parameter?

Accepted Answer

Maximum detectable velocity (Nyquist limit)

Answer

The Nyquist limit is equal to PRF/2, so increasing PRF raises the maximum velocity that can be displayed without aliasing.

Question 5

What does the wall filter (high-pass filter) in Doppler mode eliminate?

Accepted Answer

Low-frequency signals from slow-moving vessel walls

Answer

The wall filter removes low-frequency, high-amplitude signals generated by slow-moving vessel walls and surrounding tissue.

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test