Ohio General X-Ray Machine Operator (GXMO) Practice Exam

Increasing SID will result in?

Higher patient dose Lower patient dose No change Increased image noise

Correct Answer:

Lower patient dose

Explanation:

Increasing SID means the X-ray source is farther from the patient. The beam spreads out more as distance grows, and according to the inverse square law, the intensity at the patient drops with the square of the distance. With the same exposure settings (mA and exposure time), less radiation reaches the patient, so the entrance skin dose is reduced. The image receptor would also receive less exposure, which is why technique adjustments are often made to maintain image brightness, but the straightforward effect on patient dose is a decrease.

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