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NEW QUESTION # 103
Decreasing which parameter will improve axial resolution?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Axial resolution is primarily determined by the spatial pulse length (SPL), which depends on both wavelength and the number of cycles per pulse. A shorter pulse length provides better axial resolution. The Principles and Instrumentation documents state:
"Axial resolution = SPL/2. To improve axial resolution, the pulse duration must be shortened - achieved by decreasing the pulse length." Note: While increasing frequency also improves axial resolution (because it shortens wavelength), in this question, decreasing pulse length directly targets SPL, making it the most precise answer.
Therefore, the correct answer is C: Pulse length.
NEW QUESTION # 104
Which statement characterizes the primary difference between image A and image B?
Answer: B
Explanation:
The primary difference between Image A and Image B is the overall gain setting. Gain controls the amplification of the received echoes. A lower gain setting results in a darker image with less overall brightness, which is evident in Image A compared to Image B. Image B appears brighter, indicating a higher gain setting that amplifies the echoes more, making the structures appear more prominently.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Hedrick, W. R., Hykes, D. L., & Starchman, D. E. (2005). Ultrasound Physics and Instrumentation.
NEW QUESTION # 105
How is intensity of an ultrasound beam measured?
Answer: C
Explanation:
The intensity of an ultrasound beam is measured using a hydrophone. A hydrophone is a specialized device that detects and measures the acoustic pressure of the ultrasound waves in water or tissue-mimicking materials. It is highly sensitive and can measure the variations in pressure, which are used to calculate the intensity and other acoustic parameters of the ultrasound beam.
ARDMS Sonography Principles and Instrumentation guidelines
Hoskins, P. R., Thrush, A., Martin, K., & Whittingham, T. A. (2010). Diagnostic Ultrasound: Physics and Equipment.
NEW QUESTION # 106
Which parameters determine the propagation speed of sound in a medium?
Answer: C
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=#E, where#vis the propagation speed,#Eis the elasticity (or modulus of elasticity), and##is the density.
References
* ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide
* "Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau
NEW QUESTION # 107
What is the primary reason lateral resolution varies at different depths?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Lateral resolution is determined by the beam width perpendicular to the ultrasound beam's axis. As depth increases, the beam width changes due to beam divergence after the focal point. Narrower beams (better focusing) provide improved lateral resolution at specific depths.
According to sonography instrumentation reference:
"Lateral resolution depends on the width of the ultrasound beam. The narrower the beam at a particular depth, the better the lateral resolution." Therefore, the correct answer is A: Beam width.
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NEW QUESTION # 108
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