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.References:
ARDMS Sonography Principles and Instrumentation guidelines
"Sonography: Principles and Instruments" by Joan P. Baker and Marveen Craig
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