Analysis of setup uncertainties and determine the variation of the clinical target volume (CTV) to planning target volume (PTV) margin for various tumor sites treated with three-dimensional IGRT couch using KV-CBCT

ConclusionsFor adequate target coverage, van Herk-calculated CTV to PTV margin are used in our institution. To reduce the setup uncertainties and CTV to PTV margin frequently, CBCT is essential. In the yearly comparison of CTV to PTV margin, we observed that for brain and H&N cases were not in descending order due to the differently deformation of head rests which were used for molding and treatment separately.
Source: Journal of Radiation Oncology - Category: Cancer & Oncology Source Type: research