Get ARDMS SPI Exam Practice Questions - Real and Updated

Answer : B

Color flash artifact occurs due to tissue motion. This artifact is a type of color Doppler artifact that happens when there is movement of tissue or transducer, which causes the Doppler system to incorrectly interpret the motion as blood flow. This results in a flash of color appearing on the image where there is actually no flow. Tissue motion affects the Doppler signal, leading to misinterpretation by the system, and hence the artifact appears as a flash of color.

Reference

ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide

'Diagnostic Ultrasound: Principles and Instruments' by Frederick W. Kremkau

Answer : D

Comprehensive and Detailed Explanation From Exact Extract:

The primary purpose of compression is to reduce the dynamic range of received echoes, making the image more visually interpretable by adjusting contrast without losing diagnostic information.

According to sonography instrumentation reference:

''Compression reduces the dynamic range of the signal amplitudes to fit within the display range of the monitor while preserving important differences in tissue echogenicity.''

Therefore, the correct answer is D: Reduce the dynamic range.

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Answer : B

Comprehensive and Detailed Explanation From Exact Extract:

In the displayed image, the color box is not aligned parallel to the direction of blood flow in the vessel. Color Doppler is angle-dependent; when the color box is not properly steered to align with flow, the Doppler shift is reduced, and less color filling occurs. Steer the box to align the ultrasound beam more parallel to flow to maximize Doppler shift and improve color filling.

According to sonography instrumentation reference:

''Steering the color box aligns the Doppler beam with blood flow direction, optimizing the Doppler angle and improving flow visualization.''

Therefore, the correct answer is B: Steer the box.

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Answer : B

The color bar on a Doppler ultrasound display indicates the range of velocities that the system can detect and display. In color bar A, the scale is set to a higher maximum velocity (64 cm/s), while in color bar B, the scale is set to a lower maximum velocity (16 cm/s). Adjusting the scale (or velocity range) changes the upper and lower limits of the velocities displayed, which affects the sensitivity of the Doppler system to detect flow velocities. Lowering the scale allows for better visualization of lower velocities, but it may also increase the likelihood of aliasing for higher velocities.

American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.

Answer : C

Comprehensive and Detailed Explanation From Exact Extract:

Persistence is a post-processing technique that averages multiple consecutive frames to reduce random noise and smooth the displayed image. It helps enhance image quality by stabilizing slow-moving or stationary structures while sacrificing some temporal resolution.

As per official sonography Principles and Instrumentation guidelines:

'Persistence is a frame averaging technique that reduces speckle and temporal noise, improving image smoothness by combining data from successive frames.'

Elastography measures tissue stiffness.

Panoramic imaging extends the field of view.

Fusion imaging combines ultrasound with other imaging modalities.

Therefore, the correct answer is C: Persistence.