Selective Internal Radiation Therapy

Radioembolization, or selective internal radiation therapy (SIRT), is a minimally invasive treatment for tumors in which radioactive microspheres are infused into arteries feeding primary and metastatic liver tumors. The microspheres are tiny plastic or glass spheres filled with radioactive isotope Yttrium-90. The microspheres become lodged in the tumor blood vessels, causing tumor cells to die. This allows high doses of radiation to be targeted to the tumor without subjecting healthy tissue in the body to radiation

For more information go to:


YouTube Video:

Radioembolization Therapy (SIRT) Procedure:


Society of Interventional Radiology Information for Patients: Information for Patients:




Nordion TheraSphere

Virginia Piper Cancer Institute (VPCI):


Minnesota Oncology (MOHPA):