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About the Procedure

How it Works
Patient Benefits
Physician Benefits
The Trilogy™ Stereotactic System from Varian Medical Systems is the most advanced, sophisticated machine of its type in the world.
As the leading image-guided radiotherapy (IGRT) system, Trilogy marks the beginning of a new generation of cancer care. The versatile Trilogy system combines imaging and treatment technologies, and can be used to deliver the widest range of external beam radiotherapies: 3D conformal radiotherapy, IMRT, stereotactic radiosurgery, fractionated stereotactic radiation therapy and intensity-modulated radiosurgery for cancer and neurosurgical treatments.
Advanced imaging capabilities built into the system allow therapists to position patients for treatment with submillimeter accuracy. A respiratory gating system compensates for any tumor movement that occurs as a patient breathes.
 The Trilogy system is powerful, and it can deliver radiotherapy doses at least 60 percent faster than conventional accelerators. This shortens the length of time patients need to spend undergoing treatment. In addition, the radiation beam is highly precise, allowing clinicians to deliver treatments with unprecedented accuracy.
How it Works
The Trilogy system is built around an advanced medical linear accelerator, a machine that rotates 360 degrees around the patient to deliver radiotherapy treatments from many angles. The Trilogy accelerator has been enhanced for stereotactic applications that involve delivering higher doses of radiation to smaller areas over a shorter period of time.

The Trilogy system incorporates sophisticated technologies for shaping the radiation beam so that the dose of radiation is limited to the region of abnormality. By changing the beam shape over time while delivering the radiation, doctors achieve very fine control over how, and where, the radiation is administered.

The Trilogy Stereotactic System also incorporates a number of technologies for positioning patients accurately, including:

• A special X-ray imager that is used to check the patient's position prior to treatment and to monitor the position of the targeted area during treatment.

• An optical guidance system with infrared cameras that continuously monitor the patient's position to provide therapists with real-time feedback about any changes in a patient's position.

• A "respiratory gating" technology that coordinates treatment with respiration, to compensate for tumor motion due to the patient's breathing.
Patient Benefits
Through more precise targeting of the beam, radiotherapy can be more effective at treating disease while simultaneously reducing side effects of the treatment.

Due to the increased accuracy and power, smaller lesions can be treated more quickly, easily and effectively.

State-of-the-art motion management techniques allow doctors to coordinate treatment with a patient's breathing patterns. During these treatments, patients can continue to breathe naturally, reducing stress and increasing comfort.

Radiotherapy can be used to treat more different types of cancer, which means that more patients can be spared the invasive techniques of surgery and/or chemotherapy.
Physician Benefits
The Trilogy Stereotactic System is the first linear accelerator that can deliver all advanced forms of external-beam radiation therapy. By allowing doctors to choose the most appropriate treatment modality for treating cancer—whether in the body or the brain—Trilogy makes it possible to provide the most appropriate therapy for a specific patient's case, rather than being limited by technology.

With Trilogy, doctors have the option to treat small lesions using stereotactic radiosurgery, which is delivered in a single treatment; or stereotactic radiotherapy, which is delivered over a few days; as well as more traditional forms of radiotherapy.

The Trilogy system includes technology for positioning the patient exactly, using images of the tumor and surrounding anatomy taken just prior to each treatment. The images are used to verify tumor position immediately before the radiation beam is switched on. This gives clinicians the ability to maximize the dose to the tumor, and minimize the dose to surrounding healthy tissue.

The respiratory gating system automatically turns the beam off and on to compensate for breathing motion during treatment. This keeps the radiation beam focused on the tumor, and further protects normal healthy tissues.

The Trilogy system and its accessories can shape a beam very precisely, with sub-millimeter accuracy. In addition to the precision of its beam, Trilogy offers the highest dose rates available, to deliver a potent punch of radiation in a short amount of time. This combination of precision and power allows Trilogy to reduce both treatment times and side effects.
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