Advanced Physics for Brachytherapy 2018

Terminology

Planning aim dose

➢ Set of dose and dose/volume constraints for a treatment • 4 x 7 Gy to D90 to achieve 84 Gy EQD2 to D90 for HR CTV in cervix (EBRT+BT)

• 145 Gy to D90 for prostate LDR • 8 x 4 Gy to D90 for breast APBI

Prescribed dose = reported dose (input dose for dose-response analysis) ➢ Finally accepted treatment plan (which is assumed to be delivered to an individual patient) Delivered dose = dose that produces observable effect (input effect for dose- response analysis) ➢ Actually delivered dose to the individual patient From ICRU 89

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