SBRT2015

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

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