Radioembolization is the Y90 procedure. First they have to map the liver entering through the femoral artery. That is done before they actually put the radioactive seeds in the tumor. A week or more later your seeds are placed inside the targeted tumor. You are semi sedated. No pain. Takes a couple of hours. Go home same day. I am sad to say Y90 did not work for me. I think the success rate is about 80% so with cancer that’s not bad odds. Good luck.