Image Acquisition and Technical Evaluation 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

How does an increase in SID affect exposure rate according to x-ray principles?

It increases exposure rate

It has no effect on exposure rate

It decreases exposure rate

An increase in Source-to-Image Distance (SID) has a direct impact on the exposure rate due to the inverse square law, which states that the intensity or exposure of radiation decreases with the square of the distance from the source of the radiation. When the SID is increased, the radiation has to travel a longer distance to reach the image receptor. As a result, the intensity of the x-ray beam at the detector decreases, leading to a lower exposure rate. This phenomenon is a fundamental principle in radiography that helps in understanding how to optimize image quality while minimizing exposure to the patient.

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It doubles the exposure rate

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