Verification of dose volume histograms in stereotactic radiosurgery and radiotherapy using polymer gel and MRI

摘要

Experiment has shown that the polymer gel dosimeter used and the evaluation methodology described are capable of measuring DVHs for volumes that received higher doses, such as PTV. Measuring DVHs for OARs is questionable. Even a voxel size approx2 mm did not render acceptable noise level in R2 maps. Furthermore our scanning method confirmed that attention to signal variations along longitudinal axis of imaged dosimeter during acquisition must be paid (Fig 3), which is a crucial aspect when DVHs are calculated.