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Accurate Tracking Of Position And Dose During Vmat Based On Vmat-Ct, Xiaodong Zhao
Accurate Tracking Of Position And Dose During Vmat Based On Vmat-Ct, Xiaodong Zhao
LSU Doctoral Dissertations
Purpose: Local tomography reconstruction is achievable with EPID images acquired during VMAT and was named as VMAT-CT. However, it did not gain popularity due to multiple limitations and technical challenges. The goal of this study was to extend VMAT-CT concept, generate complete 3D or 4D CT images and dose, track and adapt VMAT plan based on updated images and dose.
Methods: We considered collimator angle and removed blurred areas in EPID images for VMAT-CT reconstruction to reduce artifacts and improve image quality. VMAT-CT+ images were generated by fusing VMAT-CT and planning CT using rigid or deformable registration. For 4D SBRT …