LINAC
Linear accelerator-based (LINAC) stereotactic radiosurgery is suited for targets that are larger than those treated by the Gamma Knife. This technology provides radiation doses in the form of a single highly focused beam applied in multiple sweeps around the brain lesion. It also permits multiple smaller-dose or fractionated stereotactic radiotherapy (FRS) or stereotactic radiotherapy (SRT), and not stereotactic radiosurgery (a one-session treatment). These machines are not dedicated to just treatments within the brain. They can be utilized throughout the body as well as the head and neck.
One benefit of the linear accelerator radiosurgery technology is its ability to easily treat very large tumor volumes by treating over time during cell division. However, since the linear accelerator moves during treatment, the degree of precision is less than with cobalt60 machines. The machines are made by multiple manufacturers with common brand names such as X-Knife, CyberKnife, Clinac and others. The X-Knife is the most common machine available.
Quite often, the linear accelerator radiosurgery unit is set up before a treatment can be given. This occurs after all conventional radiation therapy is completed for the day. When this is done, the number of radiosurgery treatments within the brain is not usually high on an annual basis and therefore outcomes may not be as good.
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