Physics Bucharest 2017

Pre-plan generated using TRUS dataset

• CTV = prostate + 3mm margin constrained by rectum posteriorly (CTV=PTV) • Typical planning objectives and constraints for I-125 – minimum peripheral dose of 145 Gy to CTV – V CTV 100 (CTV covered by 100% of the prescription dose) ≥ 95% – D90 (dose to 90% of the CTV) > 100% – V CTV 150 (CTV covered by 150% of the prescription dose) < 50% – Rectal mucosal volume which receives 100% (Vr100) of the dose of less than 2 cc – D urethra 10 < 150% and D urethra 30 < 130%

From: Tumour and target volumes in permanent prostate brachytherapy: A supplement to the ESTRO/EAU/EORTC recommendations on prostate brachytherapy. Salembier et al. RO 83(2007):3-10.