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ARDMS Sonography Principles and Instrumentation Sample Questions (Q155-Q160):

NEW QUESTION # 155
Which factor improves axial resolution?

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

Answer: B

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 # 156
Penetration can be improved by decreasing which setting?

A. Frequency
B. Sector width
C. Gain
D. Output power

Answer: A

Explanation:
In ultrasound imaging, penetration refers to the ability of the ultrasound beam to travel deeper into the tissue.
Lower frequency transducers produce sound waves with longer wavelengths, which are less attenuated by the tissues and therefore can penetrate deeper into the body. Conversely, higher frequency transducers produce sound waves with shorter wavelengths that provide better resolution but are more quickly attenuated, resulting in less penetration. Therefore, decreasing the frequency of the transducer improves penetration, allowing for better visualization of deeper structures.
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.

NEW QUESTION # 157
Which target group in this image of a tissue-mimicking phantom is used to evaluate axial resolution?

A. Option C
B. Option B
C. Option D
D. Option A

Answer: B

Explanation:
In the given image of a tissue-mimicking phantom, Option B (yellow box) is used to evaluate axial resolution. Axial resolution refers to the ability of the ultrasound system to distinguish between two structures that are close to each other along the path of the ultrasound beam (i.e., parallel to the beam). The targets in Option B are typically aligned in such a way to test the system's capacity to differentiate between structures that are situated closely together along the beam's axis. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Sonography: Principles and Instruments" by Joan P. Baker and Marveen Craig

NEW QUESTION # 158
Which region of this image from a sector phantom is evaluating the dead zone?
A close-up of a ultrasound Description automatically generated

A. Region B
B. Region A
C. Region D
D. Region C

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The dead zone in ultrasound refers to the shallow area immediately beneath the transducer where no useful data can be collected due to the transducer's ring-down and the time required for the system to switch from transmit to receive mode.
In a sector phantom image, the area closest to the transducer (superficial portion) is used to evaluate the dead zone. In this image, Region A is located at the top of the image, closest to the transducer surface.
According to sonography instrumentation reference:
"The dead zone is assessed by evaluating the area immediately beneath the transducer. This area is used to test the system's near-field performance and transducer surface integrity." Therefore, the correct answer is A: Region A.

NEW QUESTION # 159
Which parameters determine the propagation speed of sound in a medium?

A. Frequency and impedance
B. Elasticity and density
C. Amplitude and impedance
D. Intensity and density

Answer: B

Explanation:
The propagation speed of sound in a medium is determined by the medium's elasticity and density. Elasticity refers to the ability of the medium to return to its original shape after deformation, while density is the mass per unit volume of the medium. The speed of sound increases with higher elasticity and decreases with higher density. This relationship is described by the equation=v=PE, where v is the propagation speed, E is the elasticity (or modulus of elasticity), and p is the density.
Reference:
ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide
"Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau

NEW QUESTION # 160
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