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NEW QUESTION # 197
Which resolution is improved by focusing?
Answer: B
Explanation:
Focusing improves lateral resolution in ultrasound imaging. Lateral resolution refers to the system's ability to distinguish between two points that are side by side (perpendicular to the sound beam's path). By focusing the ultrasound beam, the width of the beam is narrowed at the focal point, enhancing the system's ability to resolve structures that are close together in the lateral plane. This results in clearer, more detailed images of the anatomical structures.
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation study materials.
Diagnostic Ultrasound: Principles and Instruments by Kremkau, F. W. (latest edition).
NEW QUESTION # 198
Which transducer was most likely used to create this image?
Answer: B
Explanation:
The image shown is typical of an abdominal ultrasound, which commonly utilizes a curvilinear transducer. Curvilinear transducers have a wider field of view at depth, making them ideal for imaging large structures within the abdomen. These transducers emit a curved beam, allowing for better penetration and a broader field of view, which is necessary for comprehensive abdominal examinations. The curvature of the image, the wide field of view, and the depth of penetration all suggest the use of a curvilinear transducer.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.
NEW QUESTION # 199
How can the spectral Doppler mirroring seen in this image be eliminated?
Answer: A
Explanation:
Spectral Doppler mirroring, also known as crosstalk, occurs when the Doppler signal appears on both sides of the baseline. This can be caused by excessively high Doppler gain, which amplifies the signal and creates artificial mirror images. Decreasing the Doppler gain reduces the signal amplitude, thereby minimizing the mirroring artifact.
ARDMS Sonography Principles and Instrumentation guidelines
Hoskins, P. R., Thrush, A., Martin, K., & Whittingham, T. A. (2010). Diagnostic Ultrasound: Physics and Equipment.
NEW QUESTION # 200
Which method of sanitizing the transducer would damage piezoelectric crystals?
Answer: D
Explanation:
Autoclaving involves high-pressure steam at high temperatures, which can damage the delicate piezoelectric crystals within the ultrasound transducer. These crystals are responsible for converting electrical energy into sound waves and vice versa. Exposure to the extreme conditions of an autoclave can cause thermal and mechanical damage to the crystals, rendering the transducer ineffective.
ARDMS Sonography Principles and Instrumentation guidelines
Zagzebski, J. A. (1996). Essentials of Ultrasound Physics.
NEW QUESTION # 201
What is measured with a test object containing closely spaced, highly reflective targets along the direction of beam?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Axial resolution is the system's ability to distinguish two structures located along the direction of the ultrasound beam (parallel to the beam axis). Test objects or phantoms contain closely spaced pins or reflectors along this axis to evaluate axial resolution.
Principles and Instrumentation state:
"Axial resolution is determined by the spatial pulse length and is tested using targets positioned along the beam axis."
* Sensitivity (A) relates to detection of weak echoes.
* Specificity (B) refers to diagnostic accuracy, not phantom testing.
* Lateral resolution (C) is evaluated using side-by-side (perpendicular) targets.
Therefore, the correct answer is D: Axial resolution.
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NEW QUESTION # 202
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