Abstract
Three different geometric treatment techniques were designed and compared on six patients who underwent CSI. Organs of interest were contoured for each patient on their simulation CT scan. The first technique consists of the conventional method for CSI utilizing two coplanar beams to cover the entire spinal axis. Our technique uses a non-coplanar half beam block on the lower spinal beam to exactly match the upper spinal beam’s divergence. Four “featherings” between the two spinal beams for each technique were still necessary to minimize under and overdosing which occur at field junctions. IMRT plans using 4 or 5 fields with 15MV energy were also generated for each patient. Mean or maximum doses for the plan and multiple organs were recorded between the three techniques on the same patient. Percent differences between doses from the conventional and IMRT plans and our technique were determined. Results
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