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Take home message: nodal CTV
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Margins add to considerable irradiation of normal tissue
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PTV margin for elective target volume:
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7-10mm margin without daily image guidance
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5mm margin with daily image guidance and bony fusion
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Potential in pelvic elective radiotherapy to reduce irradiated
volume by 40% with IMRT and daily IGRT (2500cc → 1500cc)