| http://www.w3.org/ns/prov#value | - 20140121501AUTOMATED INTRAOPERATIVE ULTRASOUND CALIBRATION - An ultrasound calibration phantom comprises a portion including at least one fiducial structure having a selected geometric arrangement; a portion adapted for mechanical coupling of the ultrasound calibration phantom to a transrectal ultrasound (TRUS) stepper; and a guide for at least one surgical instrument, the guide being mechanically
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