Study of Rotational Setup Errors and Their Dosimetric Impacts on Head and Neck IMRT Treatments Using Kilovoltage Cone-Beam Computed Tomography (kV CBCT)

Abstract

With the on-board kV CBCT available, translational and rotational (six degree) setup errors can be obtained through a 3D/3D registration between the planning CT and CBCT images. The purpose of this study is to determine the magnitude of the rotational setup errors in head & neck patients and investigate the dosimetric impact of the residual rotational setup errors on head & neck IMRT to evaluate whether the full six degree setup correction is necessary.