Stereotactic radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT) is best for very small tumors or tumors sitting within extremely critical structures, such as the brain, spinal cord, liver, lung or prostate. SRS/SBRT refers to high-dose, sub-millimeter precision utilizing highly advanced imaging techniques. Typically, SRS/SBRT is done between 1-5 total treatments. Tumor tracking is utilized by imaging consistently throughout the treatment and movement due to breathing or digestion is compensated for by the parameters of the linear accelerator. Fiducials, or radiographic markers, can be placed in the patient for more precise targeting.


The linear accelerator that utilizes SRS/SBRT at Premier Cancer Centers is the CyberKnife M6.