Dose evaluation practice for IMRT treatments at Lions Cancer Detection Centre Trust, Surat

Intensity modulated radiation therapy (IMRT) allows the three-dimensional dose distribution with computer based optimization techniques using user-specified absorbed-dose and dose-volume constraints in specified target volume and normal tissues. Dose prescription, recording, reporting and delivery play an important role in radiation therapy outcome analysis. In IMRT treatment user defined acquired inhomogeneity within target and sharp dose gradient at edge of target makes traditional dose prescription (Dmax, Dmin, Dmean) method less relevant and to overcome these issues International commission on radiation units and measurements (ICRU) provides guidelines for reporting doses in ICRU 83 Report. The study aimed to analyse the dose prescription according to ICRU-83 report for IMRT treatments at our institute. The Median dose D50% shows a good presentation of dose prescription for target volumes. The parameters introduced in ICRU 83 report (D2%, D98%) better reflect the target absorbed doses with IMRT planning techniques