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Sagittal plane image of the pelvic region with target locations marked at the base of prostate (red), midprostate (green), and apex (blue). The white bar simulates a 20-mm-diameter transrectal imaging probe. This centrally located image plane cuts through the pubic symphysis, which only has moderate X-ray density. The angle θ (yellow) represents the clear angle of access to the base of the prostate in this plane bounded by the pubis and rectum.
