Radiology Practice Test 2025 - Free Radiology Practice Questions and Study Guide

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What does the term “attenuation” refer to in radiology?

The enhancement of image resolution

The reduction of radiation intensity as it passes through matter

In radiology, the term "attenuation" specifically refers to the reduction of radiation intensity as it passes through matter. When X-rays or other forms of radiation interact with materials such as tissue, bone, or contrast agents, some of the energy is absorbed or scattered, leading to a decrease in the intensity of the radiation. This principle is fundamental in imaging techniques because it allows for the differentiation of various tissues based on their density and composition. Higher density materials, like bone, cause greater attenuation compared to softer tissues, which results in variations in the images produced. Thus, understanding how attenuation works is crucial for interpreting radiographic images accurately and assessing the underlying structures within the body.

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The amplification of sound waves in ultrasound

The increase of X-ray exposure time

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