UTC Ultrasound Technologist Equipment Operation 5

Question 1

Which of the following best describes the ALARA principle in diagnostic ultrasound?

Accepted Answer

Keep acoustic output as low as reasonably achievable while maintaining diagnostic quality

Answer

ALARA (As Low As Reasonably Achievable) means minimizing patient exposure to acoustic energy while still obtaining diagnostically useful images.

Question 2

The mechanical index (MI) displayed on an ultrasound machine is primarily used to estimate the risk of:

Accepted Answer

Cavitation (inertial and stable)

Answer

The mechanical index estimates the likelihood of cavitation, a nonthermal bioeffect caused by oscillation or collapse of microbubbles in tissue.

Question 3

A 'speckle' pattern seen on ultrasound images is caused by:

Accepted Answer

Constructive and destructive interference of sound scattered by small tissue reflectors

Answer

Speckle is an interference pattern produced when coherent sound scattered from many small reflectors combines with varying phases, creating a granular texture.

Question 4

Which control on the ultrasound machine compresses the gray-scale range displayed and can help differentiate subtle tissue echogenicities?

Accepted Answer

Dynamic range (compression) control

Answer

Reducing the dynamic range (increasing compression) narrows the displayed gray-scale, making subtle echo differences more visually apparent.

Question 5

When color Doppler shows aliasing, the most effective correction that does NOT change the sample depth is to:

Accepted Answer

Increase the color velocity scale (Nyquist limit)

Answer

Increasing the color velocity scale raises the Nyquist limit (effectively increasing PRF), allowing higher velocities to be displayed without aliasing.

(UTC) Ultrasound Technologist Certification Practice Test

(UTC) Ultrasound Technologist Certification Practice Test

UTC Ultrasound Technologist Equipment Operation 5