(a) Prostate exterior surface probing sites. Prostate is probed at 3 sites (inked) on the right and left posterior lateral surfaces, 4 sites around the apex, and 1 site at the base. (c) Prostate interior surface being probed at the right posterior location using the impedance probe. Prostate was sliced by a pathologist and placed on a cork board for evaluation, (d) Prostate being probed on the exterior surface using the impedance probe, (e) an example of a ‘benign’ probing site, identified using the histological maps provided by the pathologist. Green spot represents the location of malignant tissues within the slice, (f) an example ‘malignant’ probing site; data collected from the right posterior (lower right) side of slice in (e) is labeled ‘malignant’, whereas data collected from the right posterior side of slice in (f) is labeled benign.