**An Investigational Scan for Prostate Cancer** This study is testing a new way of using scans to find prostate cancer in men. Prostate cancer is when bad cells grow in a man's prostate. Doctors use a machine called a PET scanner with a special tracer called 18F-rhPSMA-7.3 to see if there is cancer. Another machine called an MRI scanner helps to take detailed pictures of the body. By combining these scans, doctors hope to find cancer more accurately. A biopsy is when doctors take a small piece of tissue to check for cancer. In this study, doctors will use both PET and MRI scans to help find the best spot for the biopsy. - **Time**: You will receive the tracer and have the scan about 50 minutes later. The scan itself lasts about 30 minutes. - **Participation**: You must be a man over 18, able to lie still for the scan, and sign a consent form. - **Exclusions**: Recent prostate biopsy, certain medical devices, or serious health issues might prevent participation. This study aims to see if using both scans together works better than MRI alone to find cancer in the prostate.