J Appl Clin Med Phys
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J Appl Clin Med Phys · Nov 2015
Comparative StudyPractical dose delivery verification of craniospinal IMRT.
Craniospinal irradiation (CSI) using IMRT allows dose sparing to organs-at-risk (OAR) whilst conforming the dose to the target volume. Due to the complexity of treatment involving several isocenters, the dose distribution created by the inverse-planned segmented fields must be verified prior to treatment. We propose and test methods to verify dose delivery using commonly available dosimetry equipment for commissioning and routine patient-specific dose verification of craniospinal IMRT. ⋯ The median (range) percentage of ArcCHECK diodes with a γ index < 1 for 3%/3 mm criterion is 99.7% (97.1% to 100%). Three different methods of verifying craniospinal IMRT were compared and tested. All techniques offer different benefits and together can be used for 1) commissioning the treatment technique and, separately, for 2) patient-specific pretreatment verification measurements.