Abstract:Purpose: The present study was designed to develop the validation tool for compensation of patient positioning error using digitally reconstructed radiograph (DRR) extracted from three‐dimensional computed tomography (3DCT) and two orthogonal kilo‐voltage x‐ray images. Methods: To generate DRR image from 3DCT, the ray casting which is most straightforward method was applied in this study. The traditional ray casting algorithm finds the intersections of a ray with all objects, voxels of the 3DCT volume in the s… Show more
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