2017_SBRT_Course Book

Imaging System and Radiation Isocenter Alignment

▪ External markers are first aligned with the room lasers before acquisition of orthogonal portal images. The isocenter indicated from these portal images is then compared with that obtained with that obtained with the volumetric imaging system isocenter 1

1J Bissonnette, D Moseley, E White, M Sharpe, T Purdie, D Jaffray, Quality Assurance for the Geometric Accuracy of Cone-Beam CT Guidance in Radiation Therapy. IJROBP, Volume 71, Issue 1, Supplement, 2008, S57–S61