Verification and calibration of leaf position of a multi-leaf collimator by ionization chamber arrays / 中华放射肿瘤学杂志

Objective To verify and adjust the leaf position accuracy of a multi-leaf collimator (MLC) in a linear accelerator.Methods Ionization chamber arrays ( StarTrack, IBA) were used to measure the leaf position accuracy of a MLC in a linear accelerator (Precise, ELEKTA) and adjust the leaves out of tolerance.Results After the adjustment of leaf position of the MLC, the analysis of the verification films taken at the offset position showed that the leaf position of the MLC was accurate.Conclusions The method developed in this study is convenient and simple for measurement and calibration of leaf position of the MLC in the linear accelerator, which meets the MLC position accuracy requirement for the linear accelerator.