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ARDMS SPI Exam Syllabus Topics:
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ARDMS Sonography Principles and Instrumentation Sample Questions (Q88-Q93):
NEW QUESTION # 88
What is an advantage of pulsed-wave Doppler over continuous-wave Doppler?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The primary advantage of pulsed-wave Doppler is its ability to provide range resolution. This means the operator can select a specific depth (sample volume) from which Doppler signals are acquired, allowing precise localization of blood flow velocities.
According to sonography instrumentation reference:
"Pulsed-wave Doppler allows for range resolution, enabling velocity measurements at a specific depth along the ultrasound beam path." Continuous-wave Doppler does not have range resolution, as it measures velocities along the entire beam path.
Therefore, the correct answer is C: Range resolution.
NEW QUESTION # 89
Which factor affects temporal resolution?
Answer: 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.
References
* ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide
* "Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau
NEW QUESTION # 90
Which action would increase the frame rate?
Answer: D
Explanation:
The frame rate in ultrasound imaging is influenced by several factors, including the number of focal zones.
Each focal zone requires additional transmission and reception cycles, thus decreasing the frame rate. By decreasing the number of focal zones, the system requires fewer cycles per frame, which increases the frame rate. This enhances the temporal resolution, making it easier to capture fast-moving structures in real-time imaging.
References:
ARDMS Sonography Principles & Instrumentation Guidelines
Hagen-Ansert SL. Textbook of Diagnostic Ultrasonography. 8th ed. St. Louis, MO: Mosby; 2017.
NEW QUESTION # 91
Which resolution can be evaluated in the area indicated by the red oval in this image of a tissue-equivalent phantom?
Answer: B
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.
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 # 92
Which factor improves axial resolution?
Answer: D
Explanation:
Axial resolution refers to the ability to distinguish two structures that are close to each other along the direction of the sound beam. It is determined by the spatial pulse length (SPL), which is the product of the number of cycles in a pulse and the wavelength. Shorter SPL means shorter pulse duration, which leads to better axial resolution. This is because shorter pulses allow for better separation of echoes from closely spaced structures.
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments.
NEW QUESTION # 93
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