The Application Value of Prostate Specific Membrane Antigen PET/CT in Biopsy Free of PSA Grey Area Prostate Cancer

The goal of this observational study is to establish an evaluation system for accurate identification of prostate cancer and clinical significant prostate cancer in patients in the PSA gray zone. The main questions it aims to answer are: proportion of men who could have avoided biopsy with positive PSMA-PET and no clinically significant cancer detected on biopsy. Participants will: 1. undergo PSMA PET/CT and multiparametric MRI; and 2. undergo prostate biopsy Researchers will compare the diagnostic performance of PSMA PET/CT and multiparametric MRI for prostate cancer and clinical significant prostate cancer to see if there are differences.