ARDMS Updated SPI Exam Questions and Answers by rishi

Comprehensive and Detailed Explanation From Exact Extract:

An anechoic structure (such as a cyst or fluid-filled space) allows ultrasound waves to pass through with minimal attenuation. As a result, more sound energy reaches tissues distal to the structure, producing a bright area known as posterior acoustic enhancement or increased echogenicity.

The sonography Principles and Instrumentation documents state:

"Posterior acoustic enhancement occurs distal to fluid-filled structures due to reduced attenuation through the anechoic medium, allowing increased beam intensity to reach deeper tissues."

Reduced penetration (A) and increased attenuation (B or C) would not produce enhancement.

Reduced attenuation (D) is the correct mechanism.

Therefore, the correct answer is D: Reduced attenuation through the structure.

—

Comprehensive and Detailed Explanation From Exact Extract:

When color Doppler gain is set too high, the system amplifies noise signals, leading to random color speckles appearing within anechoic or hypoechoic areas where no true flow exists. This artifact is known as "color bleeding" or "color noise."

According to sonography instrumentation reference:

“Excessive color Doppler gain can cause noise to overwrite areas without flow, resulting in false color signals within fluid-filled or hypoechoic structures.”

Therefore, the correct answer is D: Color gain set too high.

62

Which adjustment was made to change image A to produce image B?

A close-up of an ultrasound Description automatically generated

A. Increased overall gain

B. Decreased overall gain

C. Increased dynamic range

D. Decreased dynamic range

Answer: D

Comprehensive and Detailed Explanation From Exact Extract:

In Image B, compared to Image A, you can observe a higher contrast image with darker darks and brighter brights, indicating that dynamic range has been reduced. Decreasing dynamic range results in less grey scale, creating a more black-and-white appearance and emphasizing contrast differences.

According to sonography instrumentation reference:

“Reducing dynamic range increases image contrast by narrowing the range of displayed echo intensities, making the image appear more black and white.”

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

—

Sensitivity is the term for an ultrasound system's ability to display low-level echoes. It refers to the system's capacity to detect and accurately display weak echoes returning from tissues. High sensitivity allows the sonographer to visualize structures that produce faint echoes, such as small or low-contrast lesions. This parameter is critical for ensuring that subtle pathological changes are not missed during imaging.References:

ARDMS Sonography Principles and Instrumentation guidelines

"Sonography: Principles and Instruments" by Joan P. Baker and Marveen Craig

Gray-scale evaluation in a tissue-mimicking phantom involves assessing the uniformity and accuracy of the gray-scale representation of the tissues.

Option C typically contains structures designed to test the machine's ability to accurately depict varying levels of echogenicity, which is essential for proper gray-scale evaluation.

This area will have a range of echo intensities that help in determining the contrast resolution and the ability of the system to distinguish between different tissue types based on their gray-scale values.References:

ARDMS Sonography Principles and Instrumentation guidelines on tissue-mimicking phantoms and image quality evaluation.