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ARDMS Sonography Principles and Instrumentation Sample Questions (Q204-Q209):

NEW QUESTION # 204
Which artifact is seen as a result of an increase in echo amplitude in the tissue located distal to an anechoic structure?

A. Reverberation
B. Enhancement
C. Mirror image
D. Comet tail

Answer: B

Explanation:
Enhancement artifact occurs when an anechoic (or low-attenuation) structure, such as a cyst or fluid-filled structure, allows the ultrasound beam to pass through it with minimal attenuation. As a result, the tissues located distal to this anechoic structure appear brighter (increased echo amplitude) on the ultrasound image because the sound waves are less attenuated by the anechoic structure, leading to higher intensity echoes returning from the distal tissue. This increased brightness beyond the anechoic area is known as enhancement.
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.

NEW QUESTION # 205
Which artifact is seen as a result of an increase in echo amplitude in the tissue located distal to an anechoic structure?

A. Reverberation
B. Enhancement
C. Mirror image
D. Comet tail

Answer: B

NEW QUESTION # 206
Which type of resolution is improved by transmit focus?

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

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Transmit focus narrows the ultrasound beam width at specific depths, improving lateral resolution - the ability to distinguish two objects side-by-side.
According to Principles and Instrumentation:
"Lateral resolution depends on beam width and is improved by focusing, which narrows the beam in the lateral dimension." Axial resolution depends on pulse length.
Elevational resolution depends on slice thickness.
Temporal resolution relates to frame rate.
Therefore, the correct answer is C: Lateral.

NEW QUESTION # 207
Which factor improves axial resolution?

A. Increased aperture size
B. Wider beam
C. Shorter wavelength
D. Greater depth of field

Answer: C

Explanation:
Axial resolution refers to the ability of an ultrasound system to distinguish between two structures that are close to each other along the path of the ultrasound beam. It is primarily determined by the spatial pulse length, which is the product of the wavelength and the number of cycles in a pulse. Shorter wavelengths result in shorter spatial pulse lengths, thereby improving axial resolution. This is because shorter wavelengths (which correspond to higher frequencies) allow for better differentiation between closely spaced structures along the beam's axis.
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.

NEW QUESTION # 208
In this image, which characteristics of flow are represented by the upper right side of a variance mode color map?

A. Higher velocity, laminar with a positive Doppler shift
B. Higher velocity, turbulent with a positive Doppler shift
C. Higher velocity, turbulent with a negative Doppler shift
D. Higher velocity, laminar with a negative Doppler shift

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
In variance mode color Doppler, colors are assigned based on both flow direction (Doppler shift polarity) and flow character (laminar vs turbulent). In the image:
The vertical color bar shows standard Doppler shifts: positive shifts (toward the transducer) are displayed at the top, and negative shifts (away from the transducer) at the bottom.
The variance mode adds horizontal color variation (from left to right), where the right side indicates increasing turbulence.
Thus, the upper right portion of the color bar indicates:
Positive Doppler shift (flow toward the transducer)
High velocity
Turbulent flow
According to sonography instrumentation reference:
"In variance mode, the vertical axis represents flow direction and velocity, while the horizontal axis represents flow variance (turbulence). The upper right corner indicates high-velocity turbulent flow toward the transducer." Therefore, the correct answer is C: Higher velocity, turbulent with a positive Doppler shift.

NEW QUESTION # 209
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