CAMRT Radiography Practice Exam

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What characteristic of a smaller field of view (FOV) typically requires more exposure?

Image brightness
Image distortion
Image magnification
Image detail retrieval

The correct answer is: Image magnification

A smaller field of view (FOV) typically requires more exposure due to the increased image magnification and the need to obtain sufficient information from a limited area. When the FOV is reduced, the x-ray beam is concentrated on a smaller body part, which means that the receptor area that receives the x-rays is also smaller. To ensure that the anatomical structures are well visualized and that adequate diagnostic information is obtained, an increase in exposure may be necessary. This increase in exposure helps counteract the effects of increased image magnification that occurs when using a smaller FOV. Magnification can lead to a loss of detail unless exposure is sufficiently increased to maintain image quality. Therefore, understanding the relationship between FOV, exposure, and magnification is crucial for achieving high-quality diagnostic images.