Low-dose Y90 Treatment Planning for HCC

SIR-Spheres® Y-90 resin microspheres consist of biocompatible polymer resin microspheres of a median diameter of 32.5 microns (range between 20 and 60 microns) loaded with yttrium-90 (beta radiation penetrating an average of 2.5 mm in tissue to destroy tumor cells). The resin microspheres are small enough to become lodged in the arterioles within the growing rim of the tumor but are too large to pass through the capillaries and into the venous system. Since yttrium-90 has a half-life of 64.1 hours, most of the radiation (94%) is delivered to the tumor over 11 days.