Prostate cancer is the most common cancer in men, both in the USA and worldwide. One of the challenges is to stage the disease accurately and correctly before treatment. Of course, depending on where the disease is, patients will need to be treated differently. You need accurate tests and imaging techniques to locate the disease and to be sure you are giving the correct treatment for each disease stage. Staging is currently being done with conventional imaging, which includes computed tomography, bone scan, or MRI. They can have limitations, especially to stage disease that has spread out outside of the prostate.