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ARDMS Sonography Principles and Instrumentation Sample Questions (Q91-Q96):

NEW QUESTION # 91
Which feature is a characteristic of continuous wave Doppler?

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

Answer: A

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 # 92
What is the primary reason to use compression?

A. Improve the axial resolution
B. Increase line density
C. Reduce the focal region
D. Adjust the contrast resolution

Answer: D

Explanation:
* Compression in ultrasound imaging adjusts the range of grayscale displayed, affecting the contrast resolution.
* This function allows sonographers to enhance the differentiation between structures of varying echogenicities.
* By modifying the contrast resolution, sonographers can better visualize subtle differences in tissue composition and improve the diagnostic quality of the images.
* Increasing contrast resolution is particularly important in differentiating between fluid-filled cysts and solid masses.References:
* ARDMS Sonography Principles and Instrumentation guidelines on image processing and contrast resolution.

NEW QUESTION # 93
Which control should a sonographer use to change contrast resolution?

A. Output power
B. Gain
C. Dynamic range
D. Reject

Answer: C

Explanation:
* Reject: This control eliminates low-level noise and weak signals, affecting image quality but not primarily used for contrast resolution.
* Output Power: This adjusts the intensity of the transmitted ultrasound waves but does not directly change contrast resolution.
* Gain: This control amplifies all signals equally, affecting brightness but not specifically the contrast resolution.
* Dynamic Range: Adjusting the dynamic range changes the range of grayscale that the ultrasound system displays, which directly affects the contrast resolution by altering how many shades of gray are visible between the black and white extremes.
References:
"Understanding Ultrasound Physics" by Sidney K. Edelman
ARDMS Sonography Principles and Instrumentation study materials

NEW QUESTION # 94
Which artifact occurs when there is increased amplification of reflectors distal to a low-attenuating structure?

A. Reverberation
B. Enhancement
C. Refraction
D. Mirror image

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
When the ultrasound beam travels through a structure that attenuates less than surrounding tissues, more energy reaches structures located deeper. This results in stronger echo signals from those deeper structures, which is visualized as a brightening or enhancement distal to the structure. This is referred to as acoustic enhancement or posterior enhancement.
Official sonography instrumentation reference states:
"Enhancement occurs as a result of reduced attenuation of the sound beam as it passes through fluid-filled or weakly attenuating structures, causing reflectors distal to the structure to appear more echogenic than normal." Therefore, the correct answer is B: Enhancement.

NEW QUESTION # 95
Which resolution can be evaluated in the area indicated by the red oval in this image of a tissue-equivalent phantom?

A. Axial
B. Elevational
C. Lateral
D. Contrast

Answer: A

Explanation:
The tissue-equivalent phantom image with the red oval indicates an area where axial resolution can be evaluated. Axial resolution refers to the ability to distinguish between two structures that are close together along the axis of the ultrasound beam. It is determined by the spatial pulse length (SPL) of the ultrasound wave. In phantoms, this is typically tested by observing the ability to separate closely spaced targets along the beam's path.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE. Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA: Elsevier Saunders; 2005.

NEW QUESTION # 96
......

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