SPI Exam dumps PDF | Exam-Dumps.net (Page: 2)

QUESTION: 9

Which factor has a positive effect on temporal resolution?

Increase in scan depth
Use of spatial compounding
Increase in number of focal zones
Use of narrow sector width

Answer(s): D

Explanation:

Temporal resolution refers to the ability to accurately depict moving structures over time.

A narrow sector width reduces the area being scanned, which increases the frame rate because fewer scan lines are required per frame.

Higher frame rates improve temporal resolution, allowing for better visualization of fast-moving structures.

Other factors like scan depth and the number of focal zones also affect frame rate but typically reduce it when increased, thereby decreasing temporal resolution.

Reference:

ARDMS Sonography Principles and Instrumentation guidelines on factors affecting temporal resolution and frame rate.

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QUESTION: 10

Which factor affects temporal resolution?

Display depth
Time gain compensation
Overall gain
Log compression

Answer(s): A

Explanation:

Temporal resolution refers to the ability of an ultrasound system to distinguish between events occurring closely in time. It is primarily affected by the frame rate, which is the number of frames displayed per second. One of the main factors that influence the frame rate is the display depth. The deeper the imaging depth, the longer it takes for the ultrasound pulses to travel to the target and back, thus reducing the frame rate and temporal resolution. Shallower imaging depths allow for higher frame rates and better temporal resolution.

Reference:

ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide

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

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QUESTION: 11

Which type of structure is best visualized with low persistence?

Anechoic
Static
Echogenic
Dynamic

Answer(s): D

Explanation:

Low persistence is best used for visualizing dynamic structures. Persistence is a setting that controls the averaging of successive frames to reduce noise and improve image quality.
While high persistence can be beneficial for imaging static structures by providing a smoother image, it can blur or smear moving structures, making it difficult to visualize motion accurately. Low persistence settings allow for better temporal resolution and are therefore ideal for observing dynamic or moving structures such as the heart or blood flow.

Reference:

ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide

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

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QUESTION: 12

What is the relationship between overall gain and image brightness?

The higher the overall gain, the brighter the image
The lower the overall gain, the brighter the image
The higher the overall gain, the darker the image
There is no relationship between overall gain and image brightness

Answer(s): A

Explanation:

Overall gain in ultrasound refers to the amplification of all the received echo signals. Increasing the overall gain amplifies the signals, making the entire image brighter. Conversely, decreasing the overall gain reduces the signal amplification, resulting in a darker image. Overall gain adjustment affects the entire image uniformly, unlike time gain compensation (TGC), which adjusts the gain at different depths independently.

Reference:

ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide

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

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QUESTION: 13

Which settings will lead to the highest temporal resolution?

45-degree sector width, 4 cm scan depth, color Doppler off
60-degree sector width, 5 cm scan depth, color Doppler off
45-degree sector width, 4 cm scan depth, color Doppler on
60-degree sector width, 5 cm scan depth, color Doppler on

Answer(s): A

Explanation:

The settings that lead to the highest temporal resolution are those that reduce the amount of information that the ultrasound system needs to process, allowing for a higher frame rate. A smaller sector width and shallower scan depth reduce the area that needs to be imaged, enabling faster data acquisition. Turning off color Doppler further reduces processing demands, as the system no longer needs to compute and display color flow information. Therefore, a 45-degree sector width, 4 cm scan depth, and color Doppler off will provide the highest temporal resolution.

Reference:

ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide

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

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QUESTION: 14

Which parameters determine the propagation speed of sound in a medium?

Frequency and impedance
Amplitude and impedance
Intensity and density
Elasticity and density

Answer(s): D

Explanation:

The propagation speed of sound in a medium is determined by the medium's elasticity and density. Elasticity refers to the ability of the medium to return to its original shape after deformation, while density is the mass per unit volume of the medium. The speed of sound increases with higher elasticity and decreases with higher density. This relationship is described by the equation = v=E, where v is the propagation speed, E is the elasticity (or modulus of elasticity), and is the density.

Reference:

ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide

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

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QUESTION: 15

Which target group in this image of a tissue-mimicking phantom is used for gray-scale evaluation?

Option A
Option B
Option C
Option D

Answer(s): C

Explanation:

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.

Reference:

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

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QUESTION: 16

What adjustment is needed to optimize the color in the image below?

Decrease gain
Increase wall filter
Decrease persistence
Increase pulse repetition frequency

Answer(s): D

Explanation:

Increasing the pulse repetition frequency (PRF) helps to optimize the color Doppler imaging by reducing aliasing.

Aliasing occurs when the PRF is too low to accurately sample the rapid blood flow velocities, leading to incorrect color representation.

By increasing the PRF, the system can more accurately measure higher velocities without distortion, improving the overall quality of the color Doppler image.

Reference:

ARDMS Sonography Principles and Instrumentation guidelines on Doppler imaging and techniques to reduce aliasing.

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ARDMS SPI Exam (page: 2) ARDMS Sonography Principles and Instrumentation Updated on: 31-Mar-2026

QUESTION: 9

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QUESTION: 12

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QUESTION: 13

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QUESTION: 14

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QUESTION: 15

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QUESTION: 16

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ARDMS SPI Exam (page: 2)
ARDMS Sonography Principles and Instrumentation
Updated on: 31-Mar-2026