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NEW QUESTION # 201
Which effect does spatial compounding have on ultrasound images?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Spatial compounding acquires multiple frames from different angles and combines them into a single image.
This technique reduces the appearance of artifacts such as shadowing and speckle noise, resulting in a smoother, more uniform image.
According to sonography instrumentation reference:
"Spatial compounding reduces artifacts like posterior shadowing and speckle by averaging data from multiple insonation angles." Therefore, the correct answer is D: Decreases shadowing.
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NEW QUESTION # 202
What is the result of increased transducer damping?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Damping material is applied to the back of the piezoelectric crystal to absorb energy and shorten the pulse duration. Shorter pulse durations reduce spatial pulse length, which directly improves axial resolution by enabling better separation of structures along the beam path.
According to sonography instrumentation reference:
"Greater transducer damping results in shorter pulse duration and improved axial resolution but reduces sensitivity." Therefore, the correct answer is D: Improved axial resolution.
NEW QUESTION # 203
While imaging at a depth of 2 cm, which adjustment would improve the axial resolution?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Axial resolution improves with shorter spatial pulse length, which is directly related to higher frequency. At shallow depths (such as 2 cm), higher frequency can be used effectively since attenuation is minimal.
Principles and Instrumentation state:
"Axial resolution improves with increasing frequency due to shorter wavelength and pulse length."
* Turning off spatial compounding (A) affects speckle reduction.
* Harmonics (B) help with resolution but primarily lateral contrast.
* Gain (C) affects brightness, not resolution directly.
Therefore, the correct answer is D: Increase frequency.
NEW QUESTION # 204
Which adjustment will reduce the artifact in the cystic lesion in image A resulting in image B?
Answer: C
Explanation:
* Edge enhancement is a processing technique used in ultrasound imaging to improve the visibility of the edges of structures.
* In image A, the borders of the cystic lesion might appear less defined due to a lack of edge enhancement.
* By turning on edge enhancement, the ultrasound system processes the image to accentuate the boundaries, leading to a clearer and more distinct outline of the cystic lesion as seen in image B.
* This adjustment reduces the artifact within the cystic lesion by emphasizing the differences in the adjacent tissue interfaces, thus improving the overall image quality.References:
* American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines on image optimization techniques.
NEW QUESTION # 205
What is the term for the change in direction of a sound wave crossing a tissue boundary at an oblique angle?
Answer: D
Explanation:
Refraction is the change in direction of a sound wave as it crosses a boundary between two different tissues at an oblique angle, where there is a difference in propagation speeds between the tissues. This bending of the sound wave path occurs due to the change in speed, causing the wave to change direction according to Snell's law. Refraction can result in artifacts such as edge shadowing and displacement of structures in an ultrasound image.
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 # 206
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