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Do we need dose constraints and DVH parameters?
Yes !
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Dose needed to control macroscopic tumors is high
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Dose levels different for primary tumors and node metastases
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Dose levels for elective targets 45-50Gy
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Evidence for importance of DVH parameters is constantly increasing
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Dose to OAR should be as low as possible “ALARA”
How to achieve the required dose gradients ?