Common Procedures

  • Brachytherapy
  • Gamma Knife Radiosurgery
  • Image-guided
    Radiation Therapy (IGRT)
  • Intensity Modulated
    Radiation Therapy (IMRT)
  • Respiratory Gating
  • Stereotactic
    Radiosurgery (SRS)
  • Stereotactic Body
    Radiation Therapy (SBRT)

Radiation Oncology Services

Our center offers an array of radiation oncology treatments based on the individual needs of our patients. At this facility, IMRT and IGRT are available. Other procedures will be performed by a Clackamas Radiation Oncology Center physician at Providence Portland Medical Center, located at 4805 NE Glisan Street, such as HDR brachytherapy, Prostate seed implantation, Stereotactic Radiosurgery using Gamma Knife Perfexion, and Stereotactic Body Radiation Therapy.


Brachytherapy is the technique of implanting radiation sources directly into the tumor. This advanced process enables specialists to deliver the maximum-targeted dose of radiation to treat the disease effectively while sparing the surrounding tissue.

Gamma Knife Radiosurgery

In gamma-knife radiosurgery, doctors use advanced imaging technology to localize tumors with pinpoint accuracy, so an array of intersecting beams of radiation can be focused precisely on the target from many different directions. Each individual radiation beam is too weak to harm the normal tissue it passes through. The effect of gamma-knife radiosurgery occurs only at the spot where all the beams meet. With the help of a computer, this spot can be accurately plotted to within a fraction of a millimeter.

Image-guided Radiation Therapy (IGRT)

Image-guided radiation therapy (IGRT) is a process of using various imaging technologies to locate a tumor target prior to a radiation therapy treatment. This process improves treatment accuracy so that the amount of healthy tissue exposed to radiation can be reduced, minimizing the incidence of side effects. IGRT is complementary to IMRT. IMRT is used to improve the radiation delivery precision and IGRT is used to improve the radiation delivery accuracy.

Intensity Modulated Radiation Therapy (IMRT)

With the IMRT technique, your radiation oncologist can shape the radiation dose to the target and then minimize the dose to critical organs and limiting radiation damage to normal tissue.

Respiratory Gating

Our state of the art technology includes the Active Breathing Coordinator (ABC), which provides appropriate patients with left-sided breast, chest and abdomen cancers maximum precision, and safest delivery of treatment.

Stereotactic Radiosurgery (SRS)

SRS uses precise patient positioning and extremely accurate radiation delivery to treat brain lesions with a single, high dose of x-rays. Because the radiation is tightly focused on the lesion to be treated, the surrounding normal brain tissue receives very little radiation. Lesions treated with SRS include acoustic neuromas, meningiomas, recurrent gliomas, glomus jugulare tumors, arteriovenous malformations, trigeminal neuralgia, and many types of other cancer that have spread to the brain.

Stereotactic Body Radiation Therapy (SBRT)

SBRT is a treatment procedure similar to brain stereotactic radiosurgery and radiotherapy, except it deals with tumors outside the brain. It involves a single high dose radiation delivery or a few fractionated radiation deliveries. The procedure reduces the treatment time from multiple weeks to a few days. SBRT is dramatically improving the success rate in the treatment of early-stage lung cancer and oligometastases in lung, liver, and other sites.

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