Fig. 6

Superposition of original (blue) and deformed prostate in polar coordinates. a Axial views with Z = 0 for both the original and the deformed prostate. b Axial views taken at the plane where N1 (N1’) is located for the original (deformed) prostate. c Sagittal views taken at the plane where N1 (N1’) is located for the original (deformed) prostate