A parallel-hole collimator is used for a bone scan. What is the primary advantage of this collimator type?

A parallel-hole collimator is used for a

Multiple choice — select the best answer

AMaintains image size independent of source-to-collimator distance
BMagnifies the image for better spatial resolution
CIncreases sensitivity by allowing oblique photon acceptance
DReduces scatter by using a single pinhole aperture

✓ Correct answer: A. Maintains image size independent of source-to-collimator distance Parallel-hole collimators produce an image that is the same size as the object regardless of distance, making them ideal for whole-body imaging. Converging collimators magnify, diverging collimators minify, and pinhole collimators magnify only small fields of view.

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A parallel-hole collimator is used for a bone scan. What is the primary advantage of this collimator type?

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