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Applicators are not typically used for photon beams in radiotherapy because photons are highly penetrating and do not require collimation or shaping like electron beams. Instead, photon beams are shaped using multileaf collimators or other beam-shaping devices to conform to the tumor while sparing surrounding healthy tissues. Additionally, applicators are commonly used for electron beams to shape and modulate the dose distribution.

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1y ago

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