A 3D verification system using dual‐energy cone‐beam CT with background subtraction and correction for x‐ray CT‐based polymer gel dosimetry

DECBCT achieved comparable dosimetric accuracy with fewer scans than image averaging. Our approach required only 10 min of total scan time and thus was more efficient than image averaging, which requires over 1 h for image acquisition. Moreover, the BCS method effectively suppressed systematic background variations across CBCT scans. Therefore, DECBCT and the BCS method provide an effective solution for improving the dosimetric accuracy and efficiency of XCT-PGD verification systems.