Physics · Radiation Therapy Physics
Which factor most directly increases the Percentage Depth Dose (PDD) in external beam radiotherapy?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Shorter source-to-skin distance (SSD)
- 2Decreased field size
- 3Higher beam energy✓
- 4Lower patient thickness
Correct answer
Higher beam energy
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