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What does the ICRU recommend
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International Commission on Radiation Units and
Measurements (ICRU) develop guide-lines for
prescribing, recording, and reporting absorbed dose for
radiation therapy
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ICRU 50, 1993 defined GTV/CTV/PTV
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ICRU 62; 1999 added PRV, IM and setup margin
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Dose prescribed to
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100% (ICRU ref point)
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Range 95-107%
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These documents recommended concepts and
procedures for
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tumour and normal tissue delineation
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margins to take into account potential tumour invasion, organ
motion, and setup error.