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ARDMS Sonography Principles and Instrumentation Sample Questions (Q88-Q93):

NEW QUESTION # 88
What does compression affect in the ultrasound image?

A. The shades of gray displayed
B. The number of lines displayed
C. The temporal resolution
D. The elevational resolution

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Compression reduces the dynamic range of the returning echoes, which alters how many shades of gray are displayed. It compresses the range of signal amplitudes to fit into the grayscale display range.
According to sonography instrumentation reference:
"Compression alters the dynamic range, adjusting how many shades of gray are displayed to optimize image contrast." Therefore, the correct answer is B: The shades of gray displayed.
-

NEW QUESTION # 89
Which technique uses frame averaging?

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

Answer: B

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 # 90
Which factor does a string phantom evaluate?

A. Intensity values
B. Slice thickness
C. Flow velocity
D. Two-dimensional resolution

Answer: C

Explanation:
A string phantom is designed to evaluate the accuracy of Doppler ultrasound systems, specifically in measuring flow velocity. It consists of a moving string or filament that mimics blood flow within a vessel. By using this phantom, sonographers can assess how accurately the ultrasound system can detect and measure the speed of the moving target. This helps in calibrating and verifying the performance of Doppler systems, ensuring they provide accurate flow velocity readings in clinical practice.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation study materials.
Textbook of Diagnostic Sonography by Hagen-Ansert, S. L. (latest edition).

NEW QUESTION # 91
Which factor affects temporal resolution?

A. Time gain compensation
B. Overall gain
C. Display depth
D. Log compression

Answer: C

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

NEW QUESTION # 92
Which feature is a characteristic of continuous wave Doppler?

A. Aliasing
B. Low thermal index
C. Dedicated transmit and receive crystals
D. Range specificity

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Continuous wave (CW) Doppler utilizes two separate crystals: one constantly transmitting and one constantly receiving. This setup allows CW Doppler to measure very high velocities without aliasing, but at the cost of losing range specificity (no depth resolution).
According to sonography instrumentation reference:
"Continuous wave Doppler uses two separate elements for continuous transmission and reception of sound waves, allowing for detection of very high velocities but without depth specificity." Therefore, the correct answer is D: Dedicated transmit and receive crysta

NEW QUESTION # 93
......

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