IMRT SX1

Name (ID): zz_gyn1, zz_gyn1 (zz_gyn1), (zz_gyn1)
Plan or PlanSum ID: Eti10cm2IsoIM

This cervix/pelvis case target shape (sometimes referred to as a “chimney” field) proved too large (head to foot) to fit inside a single isocenter beam arrangement on this linear accelerator.  Two isocenters were placed with a single 10cm head to foot shift between them to accommodate this large target.  Eleven (11) non equally spaced beams were placed on the inferior isocenter with beam edges set manually to follow the shape of the target in the transverse plane and only seven (7) beams were placed on the superior isocenter as the superior target portion was a simpler shape .  All eighteen (18) beams were optimized together in a single plan and the plans were then broken apart into separate single isocenter plans for treatment delivery as required by the current software release.  Dose constraints followed RTOG-1203 and were all met except a minor deviation in bladder dose due to the amount of overlap with the target.

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