ARDMS Ultrasound Physics & Instrumentation Practice Exam 2025 - Free Ultrasound Practice Questions and Study Guide

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What is shadowing in ultrasound imaging?

An increase in echo amplitude posterior to a strongly reflecting structure

A reduction in echo amplitude posterior to a highly attenuating structure

Shadowing in ultrasound imaging refers to the reduction in echo amplitude posterior to a highly attenuating structure. This occurs when sound waves encounter an object that absorbs or reflects most of the ultrasound energy, leading to a decrease in the intensity of the returning echoes from the tissues that are located deeper behind that object. As a result, the areas directly behind the attenuating structure appear darker or anechoic on the ultrasound image because fewer sound waves penetrate and reflect from those tissues.

This phenomenon is commonly seen when imaging structures such as bones or calcifications, which significantly alter the path of the ultrasound waves. Understanding shadowing is crucial for interpreting ultrasound images, as it can obscure underlying structures and lead to challenges in accurate diagnosis.

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A technique to increase frame rate

A phenomenon that enhances image resolution

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