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Increasing rectal volumes: sagittal view for increasing rectum volumes (30, 90, and 150 mL) for (a) CT‐SIM, (b) MR‐Linac, (c) T1W MR‐SIM, and (d) T2W MR‐SIM. The bladder (Bl), rectum (R), prostate (P), and bone (Bo) are labeled in each modality.
