Beyond the Freehand Biopsies: A More Precise Approach
Director of the Urology Robotics Program. "Biopsy targeting errors are on the order of 9 millimeters – too high to reliably find a clinically significant tumor in the prostate." There are many reasons why needle biopsies miss cancer, including errors in execution – aiming for one part of the prostate but not hitting it – and problems with the imaging. But Stoianovici believes that one big problem is the lack of a good map – a "general, commonly accepted system to define a prostate location precisely and accurately." Instead, biopsy samples are usually taken from regions of the prostate, "but these are not assigned relative to the prostate, and they are different from one session to another and across imaging modalities and procedures."