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High-quality SPI Dump Collection Help You Pass Success Your SPI: Sonography Principles and Instrumentation Exam Efficiently

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q154-Q159):

NEW QUESTION # 154
What is an advantage of using pulsed wave Doppler as compared to using continuous wave Doppler?

A. Higher echo sensitivity
B. Improved temporal resolution
C. Decreased display of aliasing
D. Ability to select sample depth

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The key advantage of pulsed wave Doppler is range resolution, meaning the operator can select a specific depth (sample volume) for measuring velocities. Continuous wave Doppler does not provide this capability, as it samples velocities along the entire beam path.
According to sonography instrumentation reference:
"Pulsed wave Doppler allows selection of sample volume depth, providing range resolution which continuous wave Doppler lacks." Therefore, the correct answer is B: Ability to select sample depth.

NEW QUESTION # 155
Which region of this image from a sector phantom is evaluating the dead zone?

A. Region C
B. Region A
C. Region B
D. Region D

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The dead zone in ultrasound refers to the shallow area immediately beneath the transducer where no useful data can be collected due to the transducer's ring-down and the time required for the system to switch from transmit to receive mode.
In a sector phantom image, the area closest to the transducer (superficial portion) is used to evaluate the dead zone. In this image, Region A is located at the top of the image, closest to the transducer surface.
According to sonography instrumentation reference:
"The dead zone is assessed by evaluating the area immediately beneath the transducer. This area is used to test the system's near-field performance and transducer surface integrity." Therefore, the correct answer is A: Region A.
-

NEW QUESTION # 156
Which technique uses frame averaging?

A. Panoramic
B. Elastography
C. Fusion imaging
D. Persistence

Answer: D

Explanation:
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.

NEW QUESTION # 157
Which describes the reflected frequency when a reflector is moving toward the sound source?

A. Unchanged
B. Decreased
C. Increased
D. Attenuated

Answer: C

Explanation:
When a reflector (such as red blood cells) is moving toward the sound source, the frequency of the reflected sound waves increases. This phenomenon is known as the Doppler effect. The frequency shift occurs because the motion of the reflector compresses the sound waves, leading to a higher frequency than the emitted frequency. This increased frequency is what the Doppler ultrasound system detects and uses to calculate the velocity of the moving reflector.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Hoskins, P. R., Thrush, A., Martin, K., & Whittingham, T. A. (2010). Diagnostic Ultrasound: Physics and Equipment.

NEW QUESTION # 158
Which type of display process rescans only the region of interest and improves resolution?

A. Write magnification
B. Read magnification
C. Frequency compounding
D. Spatial compounding

Answer: A

Explanation:
Write magnification, or pre-processing zoom, involves rescanning the region of interest (ROI) with more scan lines, thus acquiring new data for that specific area. This process increases the spatial resolution of the image in the magnified area because it gathers more detailed data by adjusting the scan parameters, resulting in improved image quality. This is different from read magnification (post-processing zoom), which simply enlarges the existing image data without increasing resolution.
References:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE.Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA:
Elsevier Saunders; 2005.

NEW QUESTION # 159
......

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