Y90 Radioembolization Dose Delivery and Radiation Exposure Assessment

This study is measuring how radiation is delivered during a liver treatment called Y90 radioembolization — a procedure where tiny radioactive beads are placed inside blood vessels feeding a liver tumor — and how much radiation exposure occurs to staff and patients, in order to improve safety and treatment accuracy. **You may be eligible if...** - You are already scheduled to receive Y90 radioembolization treatment for a liver condition or liver tumor - You can tolerate an additional PET/CT scan after your treatment - You can tolerate a few extra blood draws before, during, and after the procedure - You can remain at the hospital for the additional imaging after treatment **You may NOT be eligible if...** - You are not a candidate for Y90 radioembolization - You cannot tolerate additional imaging or blood draws - Your schedule does not allow you to stay for the extra scan after treatment Talk to your doctor to see if this trial is right for you.