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ARDMS Sonography Principles and Instrumentation Sample Questions (Q121-Q126):

NEW QUESTION # 121
Which feature is a characteristic of continuous wave Doppler?

A. Aliasing
B. Dedicated transmit and receive crystals
C. Range specificity
D. Low thermal index

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Continuous wave (CW) Doppler utilizes two separate crystals: one constantly transmitting and one constantly receiving. This setup allows CW Doppler to measure very high velocities without aliasing, but at the cost of losing range specificity (no depth resolution).
According to sonography instrumentation reference:
"Continuous wave Doppler uses two separate elements for continuous transmission and reception of sound waves, allowing for detection of very high velocities but without depth specificity." Therefore, the correct answer is D: Dedicated transmit and receive crysta

NEW QUESTION # 122
Which component of a transducer lowers the acoustic impedance mismatch between the transducer and the patient?

A. Matching Layer
B. Backing Material
C. Piezoelectric Material
D. Lens

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The matching layer is placed in front of the piezoelectric element and serves to reduce the difference in acoustic impedance between the transducer and human tissue, thereby improving sound transmission and minimizing reflection at the interface.
According to sonography instrumentation reference:
"The matching layer minimizes impedance mismatch between the transducer and soft tissue, allowing more efficient transmission of ultrasound energy into the patient." Therefore, the correct answer is D: Matching Layer.
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NEW QUESTION # 123
Which effect does spatial compounding have on ultrasound images?

A. Increases propagation speed
B. Increases shadowing
C. Decreases shadowing
D. Decreases propagation speed

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Spatial compounding acquires multiple frames from different angles and combines them into a single image.
This technique reduces the appearance of artifacts such as shadowing and speckle noise, resulting in a smoother, more uniform image.
According to sonography instrumentation reference:
"Spatial compounding reduces artifacts like posterior shadowing and speckle by averaging data from multiple insonation angles." Therefore, the correct answer is D: Decreases shadowing.
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NEW QUESTION # 124
Which method of sanitizing the transducer would damage piezoelectric crystals?

A. Bleach
B. Autoclave
C. Glutaraldehyde
D. Alcohol

Answer: B

Explanation:
Autoclaving involves high-pressure steam at high temperatures, which can damage the delicate piezoelectric crystals within the ultrasound transducer. These crystals are responsible for converting electrical energy into sound waves and vice versa. Exposure to the extreme conditions of an autoclave can cause thermal and mechanical damage to the crystals, rendering the transducer ineffective.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Zagzebski, J. A. (1996). Essentials of Ultrasound Physics.

NEW QUESTION # 125
During a color Doppler scan, which angle to flow would most likely result in no color being visualized?

A. 3 degrees
B. 45 degrees
C. 175 degrees
D. 88 degrees

Answer: D

Explanation:
Color Doppler imaging is most effective when the angle between the ultrasound beam and the flow of blood is small.
At an angle of 88 degrees, the flow of blood is nearly perpendicular to the ultrasound beam.
When the angle is close to 90 degrees, the Doppler shift (frequency change) approaches zero, resulting in little to no color being visualized on the Doppler image.
Thus, to obtain a color signal, the angle should be optimized to be as close to 0 degrees as possible, with 60 degrees being the practical limit for accurate Doppler measurements. Reference:
ARDMS Sonography Principles and Instrumentation guidelines on Doppler angle and its effect on Doppler imaging.

NEW QUESTION # 126
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