There are two main types of radiation therapy: external-beam radiation therapy and internal radiation therapy. Your radiation oncologist will talk with you about the type that is best for your situation and the reasons why. In some cases, depending upon your diagnosis and the type of treatment needed, your care team may coordinate and schedule your treatment at other facilities, including the central SCCA clinic or the University of Washington Medical Center.

External-Beam Radiation Therapy
External-beam radiation therapy refers to treatments in which the radiation is generated from a source outside your body, and the beams are then pointed precisely at your tumor. This is the most common type of radiation therapy for cancer. External-beam radiation therapy includes:

  • Three-dimensional conformal radiation therapy (3D-CRT)
  • Intensity-modulated radiation therapy (IMRT)
  • Stereotactic radiosurgery (including gamma knife radiosurgery)
  • Intraoperative radiation therapy (IORT)
  • Total body irradiation
  • Electron therapy
  • Proton therapy

Read more about each form of external-beam radiation therapy.

Internal Radiation Therapy
Internal radiation therapy refers to treatments in which a radioactive substance is placed inside your body so it can release radiation from within. Often the substance is a small implant.Internal radiation therapy includes:

  • Brachytherapy
  • IORT using brachytherapy
  • Systemic radiation therapy

SCCA offers all of these forms of internal radiation therapy. Read more about each form of internal radiation therapy.