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1100 West Stewart Dr, Orange, CA 92868714.633.9111
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Radiation Oncology

Stereotactic Radiosurgery (SRS)

Stereotactic radiosurgery (SRS) and stereotactic body radiation therapy (SBRT) apply intense radiation with millimeter accuracy for hard to reach tumors with no general anesthesia, minimal recovery time and improved patient comfort.

Stereotactic radiosurgery (SRS)

SRS is a non-surgical, high precision radiation therapy that uses very high doses of radiation to very small areas for the treatment of various brain tumors including metastatic tumors, benign conditions and abnormal blood vessel formations.

The Trilogy stereotactic system at The Center for Cancer Prevention and Treatment offers both frame-based and frameless SRS treatment using cones and intensity modulated stereotactic radiotherapy. The system offers an optical positioning system for millimeter accuracy and high dose rates for treatment that is up to 75 percent faster than comparable systems.

In many cases, SRS can eliminate the need for implanted markers and frames, sparing the patient from invasive procedures. When used in conjunction with our high precision image guidance and patient positioning systems, SRS is a safe and effective treatment option for many patients.

These pictures show an actual SRS planning/dose distribution for two tumors in the brain.


Stereotactic body radiation therapy (SBRT)

Stereotactic body radiation therapy is designed to deliver radiation with high precision to small tumors in the lung and liver.

With the help of a 4D CAT scan and respiratory gating technology, SBRT treatments take into account the movement of the tumor in the lung caused by a patient's breathing pattern. The advanced accuracy enables our radiation oncology experts to deliver higher doses of radiation, which increases the treatment's effectiveness while minimizing damage to surrounding healthy tissue.

Studies have shown that SBRT provides superior clinical outcomes in patients who are poor surgical candidates with early stage lung cancer compared with standard radiation. Typically, SBRT consists of three to five sessions delivered over one to two weeks.


To ensure radiation is delivered with pinpoint precision, patients are immobilized to help further minimize breathing movement, and therefore, movement of the tumor.