Clover Learning Physics Practice Test

What is the visual appearance of patient motion on a radiograph?

Blurring of anatomy Sharper edges Increased contrast Uniform brightness

Correct Answer:

Blurring of anatomy

Explanation:

Motion during a radiograph causes blur because the exposure records every moment of movement, so the moving anatomy smears across the image over the time the X-ray beam is on. This time-averaging makes edges lose crispness and structures blend into a hazy, smeared appearance. That blur is the clear sign that motion affected the image. Sharper edges would require the patient to stay still; increased contrast comes from how much the tissues absorb X-rays and the exposure settings, not from motion; and uniform brightness describes even exposure overall, not the presence of motion blur. To reduce this artifact, use a shorter exposure time, proper immobilization, and clear instructions for the patient to remain still.

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