Evaluation of dosimetric properties of shielding disk used in intraoperative electron radiotherapy: A Monte Carlo study

A shielding disk is used for IOERT procedures to absorb radiation behind the target and protect underlying healthy tissues. Setup variation of shielding disk can affect the corresponding in-vivo dose distribution. In this study, the changes of dosimetric parameters due to the disk setup variations is evaluated using EGSnrc Monte Carlo (MC) code. The results can help treatment team to decide about the level of accuracy in the setup procedure and delivered dose to the target volume during IOERT. •A two-layer format of shielding disks is used in IOERT for protection of tissues.•Dosimetric parameters of shielding disk were calculated with Monte Carlo simulation.•Setup variation of shielding disk can affect the in-vivo dose distribution in IOERT.•The dose distribution in various setups of the disk was demonstrated, quantitatively.