Diffuse optical tomography (DOT) is a novel imaging modality that uses low-intensity, near-infrared light to characterize tissue. DOT analyzes the light being reflected and transmitted through tissue to generate three-dimensional images of chromophores and light scattering. As such, DOT serves as a functional imaging modality, measuring both tissue vascularity and architecture. The investigators believe that DOT will be able to detect prostate cancer in men suspected of the disease and will also be able to risk-stratify patients found to have prostate cancer to help guide treatment options. DOT may be able to directly measure two factors important in the prognosis of patients with prostate cancer: the Gleason score and microvessel density (MVD).