Observations on prostate intrafraction motion and the effect of reduced treatment time using volumetric modulated arc therapy

Our study is unique in exploring the role of session duration on intrafraction motion in the setting of electromagnetic transponders as well as VMAT. Our main results demonstrate that observed intrafraction prostate motion during radiotherapy is greater with increasing session time. Additionally, VMAT, due to shorter treatment sessions, resulted in significant reduction (30%-40%) in intrafraction displacements.