Figure 2.

SRS treatment design. (a) SRS treatment field delivery, image acquisition, and couch rotation for two treatment examples. The 2nd mid‐treatment image in the left treatment example was captured at a couch angle of 60° if the IR markers were not obstructed by the gantry, if the markers were obstructed, then the couch was rotated to 0° for image acquisition. (b) the IEC scale used for couch rotations in this study. The solid rectangle and line with arrow head indicate couch position at couch angle 0°. The dotted rectangle and arrow indicate couch position at couch angle 45°.