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Facts about Stereotactic Radiosurgery


How Does it Work?

TrueBeam STx radiosurgery is not appropriate for all cancers. Serious side effects, including fatigue and skin irritation, can occur. Treatment times may vary. Ask your doctor if TrueBeam STx treatment is right for you.
TrueBeam STx combines imaging, sophisticated and powerful beam delivery and advanced motion management to perform radiosurgery with great precision and speed.  

Here are some quick facts:

  • TrueBeam STx rotates around the patient to deliver a prescribed radiation dose from nearly any angle.
  • Precision is measured in increments of less than a millimeter.
  • A high-definition multi-leaf collimator (or MLC) is what shapes the beam. It has 120 computer-controlled “leaves” or “fingers” that create apertures of different shapes and sizes. The leaves sculpt the beam to match the 3-D shape of the tumor. These can move and change during treatment to target the tumor and minimize dose to the surrounding healthy tissue.
  • TrueBeam STx’s additional functionality provides for the acquisition of a cone-beam CT, a form of CT, using 25% less X-ray dose than compared with earlier Varian image-guided technologies. This means patients can be exposed to less X-rays/radiation.
  • Real-time imaging tools allow clinicians to “see” the tumor they are about to treat. This gives them confidence, and they can target tumors with accuracy measured in millimeters.
  • The system includes a new “gated” option for synchronizing beam delivery with respiration. This helps maintain accuracy as the system changes its targeting whenever tumor motion is an issue, for example during lung cancer treatments.
  • A patented High-Intensity Mode can deliver dose rates that are twice as fast as the current technologies

Patient Benefits

  • TrueBeam STx gives medical professionals the tools to treat more challenging cancers such as cancers of the brain, spine, lung, liver, pancreas and prostate.
  • TrueBeam STx is fast and precise. A complex radiosurgery treatment that typically takes 30 to 60 minutes can be completed in just 5 to 20 minutes.
  • With advanced imaging, the TrueBeam STx system allows clinicians to deliver treatment accurately by enabling them to “see” the tumor they treat and target tumors with submillimeter accuracy.
  • Enhanced motion-management tools synchronize beam delivery with the tumor motion that occurs as you breathe in and out.
  • TrueBeam STx was developed with an emphasis on your comfort.