SBRT 2016

Some Concluding Remarks

 In radiosurgery often 0-mm margins are being advocated  There will always be residual geometrical uncertainties  Target definition

 Errors in image-guidance systems  Indirect measures of tumor position

 Always verify the margin algorithm used in the Treatment Planning System  3D margin algorithm (and not 2D)  What is the resolution of the margin algorithm (e.g. CT resolution?)  Verify that margin are not truncated to voxel positions, especially in the superior-inferior direction