Use of Surface Imaging in Combination With IGRT for Proton Beam Craniospinal Irradiation (CSI) Setup

For proton CSI, while setting up the patient for the brain and cervical spine treatment, surface imaging provides a useful guidance for the setup of the spine. Overall, surface imaging provides a larger field of view than KV-imaging with no additional imaging dose. For treatment with target size larger than imaging field, surface imaging can potentially reduce the amount of setup images thus reduce imaging dose and increase setup efficiency.