ARDMS SPI Exam With Confidence Using Practice Dumps

Transducer beam divergence is influenced by the aperture size and frequency. A smaller aperture and lower frequency result in greater beam divergence. Among the given options, the transducer with a 4 mm aperture and 4 MHz frequency will have the greatest divergence. This is because the smaller aperture size contributes to a wider beam spread, and the lower frequency also increases the divergence compared to higher frequencies.

ARDMS Sonography Principles and Instrumentation guidelines

Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.

Enhancement is an artifact that results from decreased attenuation. When an ultrasound wave travels through a medium with lower attenuation compared to surrounding tissues, it loses less energy. Consequently, the structures located deeper than the low-attenuation medium appear brighter on the ultrasound image. This artifact is commonly observed behind fluid-filled structures, such as cysts or the urinary bladder, where the sound waves encounter minimal resistance and thus less attenuation.References:

ARDMS Sonography Principles and Instrumentation guidelines

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

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.

QUESTION NO10

Which change would allow low velocities to be displayed in this spectral Doppler image?

A close-up of a ultrasound Description automatically generated

A. Decrease compression

B. Increase sample volume size

C. Increase transmitted frequency

D. Decrease wall filter

Answer: D

Comprehensive and Detailed Explanation From Exact Extract:

In the spectral Doppler display shown, the wall filter setting determines the lower limit of velocity signals that are displayed. A high wall filter removes low-velocity signals (such as end-diastolic flow or slow venous flow), while a lower wall filter allows both high and low velocities to be visualized.

According to the official Principles and Instrumentation documents:

"The wall filter eliminates low-frequency Doppler shifts, which correspond to low-velocity blood flow or motion artifacts. Decreasing the wall filter allows display of low-velocity flow components that may otherwise be filtered out."

Decreasing compression (A) adjusts dynamic range but does not influence velocity detection.

Increasing sample volume size (B) affects spatial resolution and signal amplitude but not velocity thresholds.

Increasing transmitted frequency (C) may improve sensitivity but does not directly control the display of low velocities.

Therefore, the correct answer is D: Decrease wall filter.