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