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Figure 1. The rectangular outlines in each beam's eye view denotes the field defining collimators. We use a gantry angle convention where a 0 degree beam direction defines an anterior field for a supine patient and angles increase in a clockwise direction about the patients left side. We note that each beam is forced to conformally avoid the (rendered) cord. The non-uniform outline denotes the maximum irradiated area under each of the intensity modulated beams.
