Increasing the thickness of filtration has what effect on a patient's entrance skin dose (ESD)? Assume no other factors change.

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Multiple Choice

Increasing the thickness of filtration has what effect on a patient's entrance skin dose (ESD)? Assume no other factors change.

Explanation:
Increasing filtration removes the soft, low-energy photons that would deposit a lot of their energy in superficial tissues. Those photons contribute significantly to the entrance skin dose, so filtering them out hardens the beam and, with the same exposure factors, fewer photons reach the skin. The net effect is a lower entrance skin dose. (In practice, to keep receptor exposure the same, you’d typically raise exposure factors, but with no other changes, the skin dose decreases.)

Increasing filtration removes the soft, low-energy photons that would deposit a lot of their energy in superficial tissues. Those photons contribute significantly to the entrance skin dose, so filtering them out hardens the beam and, with the same exposure factors, fewer photons reach the skin. The net effect is a lower entrance skin dose. (In practice, to keep receptor exposure the same, you’d typically raise exposure factors, but with no other changes, the skin dose decreases.)

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