Skip to main content
Figure 8 | Radiation Oncology

Figure 8

From: Technique for sparing previously irradiated critical normal structures in salvage proton craniospinal irradiation

Figure 8

Dose volume histogram for case 1. The dose delivered in reirradiation to the cranial PTV 36 Gy is compared for three treatment options: lateral X-ray fields with blocks, a 9-field coplanar intensity modulated radiation (IMRT) plan, and a lateral proton fields with blocks and inverse apertures. The lateral proton plan provides improved coverage of the cranial PTV 36 Gy. The dose to the optic chiasm from the initial radiation treatment plan is shown, labeled “d”, while the cumulative dose to the optic chiasm from prior radiation and reirradiation is compared by the same three treatment plans. The lateral proton plan incurred virtually no additional dose to the optic chiasm, and the cumulative dose was less than with the lateral X-ray plan or the IMRT plan.

Back to article page