ARDMS Ultrasound Physics & Instrumentation Practice Exam 2026 - Free Ultrasound Practice Questions and Study Guide

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What does the "mechanical index" represent in ultrasound imaging?

A measure of the patient's health during ultrasound exposure

A measure of the intensity of ultrasound waves in tissues

A measure of the potential for cavitation related to ultrasound exposure

The mechanical index represents the potential for cavitation related to ultrasound exposure. In ultrasound imaging, cavitation refers to the formation of microscopic bubbles in tissues due to the pressure variations caused by ultrasound waves. The mechanical index (MI) is calculated based on the peak rarefactional pressure of the ultrasound beam and the frequency of the ultrasound. A higher MI indicates a greater potential for cavitation to occur, which is particularly important in diagnostic ultrasound because it helps to assess the safety of ultrasound exposure, especially at certain frequencies and intensities. Understanding the mechanical index is crucial for ensuring that ultrasound examinations are performed in a way that minimizes risks to the patient while still providing effective imaging.

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A calculation of the depth of sound penetration in the medium

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