Ultralow Dose PET Imaging for PSMA Expression

This study is testing whether a very low-dose PET scan can accurately detect a protein called PSMA on cancer cells — the same information currently requiring standard higher-dose scans — reducing patients' radiation exposure during imaging. **You may be eligible if...** - You are 18 or older - You are able to give informed consent and follow study procedures - Women of childbearing potential must not be pregnant or breastfeeding and must have a negative pregnancy test **You may NOT be eligible if...** - You have already received the maximum allowed radiation from research scans (50 mSv per year) - You have enrolled in this specific study more than four times previously - You have severe claustrophobia, chronic pain, or a physical condition that prevents you from completing a PET scan - You are currently receiving PSMA-targeted radiation therapy (e.g., lutetium-177) - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.