An Integrated Approach to Verify Spot Position and Isocenter in Image-Guided Proton Therapy

Combining an XCT-PGD with CBCT provides a robust and comprehensive method for 3-dimensional verification of the accuracy of proton therapy delivery. This novel approach offers advantages over conventional QA techniques by enabling simultaneous evaluation of spot positions and isocenter accuracy while minimizing setup uncertainties. The method is particularly suitable for annual QA and commissioning procedures in proton therapy facilities.