American Registry of Radiologic Technologists (ARRT) Practice Exam

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When the field of view (FOV) decreases, what happens to the brightness in radiographic images?

Increases

Decreases

When the field of view (FOV) decreases in radiographic imaging, the brightness of the image generally decreases. This occurs due to the narrowing of the area being imaged, which results in fewer photons being captured in the image receptor. A smaller FOV means that the same amount of radiation is concentrated over a smaller area, leading to a lower overall exposure. Consequently, this reduced exposure can result in a darker or less bright image because there are fewer photons contributing to the image formation.

Additionally, in certain imaging techniques, decreasing the FOV can enhance the resolution, but it can also lead to increased noise, which further impacts the perceived brightness and quality of the image. Therefore, the relationship between FOV reduction and brightness is significant; as the FOV decreases, brightness diminishes accordingly.

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Remains the same

Fluctuates

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