Fig. 2From: Surface-projection-based transperineal cognitive fusion targeted biopsy of the prostate: an original technique with a good cancer detection rateSite A and B on the perineum skin. Site A is located 1.5 cm above and 1.0 cm to the side of the middle point of the superior border of the anus. It is usually a surface projection of the middle-right region of the peripheral zone (region 6 in Fig. 1). Site B should be the surface projection of the suspicious region of the prostate. Two guiding needles have been inserted through site A and B. d: distance from B to A; a: angle from B to ABack to article page