Rectangular collimation reduces tissue exposure by what percent compared with round PID?

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Prepare for the South Carolina Dental Association Radiation Safety Test with flashcards and multiple choice questions, complete with hints and explanations. Get ready for success!

Multiple Choice

Rectangular collimation reduces tissue exposure by what percent compared with round PID?

Explanation:
Rectangular collimation reduces the beam to the size of the image receptor, which means much less tissue is irradiated compared to a round beam that covers a larger area. This beam-size reduction lowers the overall tissue dose by about 60% when using rectangular collimation versus round. That substantial dose decrease is why rectangular collimation is preferred for intraoral radiographs. Options suggesting only small reductions or an increase don’t align with the way beam size directly limits exposed tissue.

Rectangular collimation reduces the beam to the size of the image receptor, which means much less tissue is irradiated compared to a round beam that covers a larger area. This beam-size reduction lowers the overall tissue dose by about 60% when using rectangular collimation versus round. That substantial dose decrease is why rectangular collimation is preferred for intraoral radiographs. Options suggesting only small reductions or an increase don’t align with the way beam size directly limits exposed tissue.

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