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TRUS image. B1: MR image. A2–A4: Deformed MR images after registration by SurfReg, CnnReg and ProRegNet, respectively. B2-B4: JD absolute error for SurfReg, CnnReg and ProRegNet, respectively. Blue contours indicate the TRUS prostate shapes while the red contours indicate MR prostate shapes. Poor registration was observed at regions where JD error was large, as indicated by arrows.
