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Step-two deformable registration examples. (a) and (d) are the MVCT images. (b) and (e) are the kVCT images. (c) and (f) are the registered MVCT. The bladder, the prostate, and the rectum are at the top, the middle, and the bottom in (a) to (f), and are at the left, the middle, and the right in (g) to (i), respectively. Solid, dashed, and dotted are the line styles for MVCT, kVCT, and deformed MVCT structures, respectively.
