Ask the Expert: Stereotactic Radiosurgery

What is Stereotactic Radiosurgery and how does it work?

Stereotactic radiosurgery is a specialized radiation technique designed to deliver single, large doses of radiation to small areas within the brain. This treatment is usually performed using a special head frame (for positioning and immobilizing the person) combined with precision localization of the area to be treated by computed tomography (CT) or magnetic resonance imaging (MRI) followed by radiation delivery on a specialized radiation machine using many, small, highly focussed radiation beams. Treatments are usually delivered over a small number (1-5) of treatment sessions and higher doses per treatment are used compared to typical brain radiotherapy (typically 10-30 treatments). Gamma knife and Cyberknife are specialized radiation machines that are designed especially for stereotactic radiosurgery. Radiosurgery can also be performed on specially modified linear accelerators (radiation machines used to treat cancer) as well as modified Proton beam units.  All of these types of machines can deliver equally high quality radiosurgery.  Just as important as the type of Radiosurgery equipment is the availability of an experienced team of Neurosurgeons, Radiation Oncologists, Neurologic Radiologists, Physicists and Radiation Therapists who are available to advise patients on their options and coordinate and deliver the treatment.

Do we have this treatment available in Canada?

Specialized radiation machines like Cyberknife and Gamma Knife are available in some Cancer Centres and Hospitals in Canada. Linear accelerators that are able to deliver radiosurgery treatments are available in most Cancer Centres in Canada. Proton beam radiosurgery is not available in Canada.

What patients are eligible for this treatment?

Stereotactic radiosurgery seems to be most effective in treating people with small low-grade / non-malignant tumours in the brain (such as arteriovenous malformations, some meningiomas or acoustic neuromas) as well as selected people with cancer that has metastasized (spread) to the brain. Stereotactic radiosurgery is not appropriate for people with large tumours, tumours that are involving many different areas of the brain, tumours that are close to certain structures like the eyes or optic nerves or tumours that are diffuse (spreading within normal brain tissue).  For patients with these types of tumors, fractionated stereotactic radiotherapy given over longer periods of type (10-30 daily treatments over 2-6 weeks) can be a safer alternative than radiosurgery.

You can download this information as a Brain Tumour Foundation of Canada Information Sheet (pdf).
Thank you to Dr. Glenn Bauman, a Radiation Oncologist, for his time answering these important questions. Dr. Bauman is a member of our Professional Advisory Group.

Return to Information Sheets here.

Share This

Featured Story

Kate's Mum's Story

"May 2006 is a month I will never forget. That was the moment that everything became before the cancer, and after the cancer. It was a mark in time that would forever change my family"... Read more about Kate's Mum's story from her diagnosis of glioblastoma in 2006 and how Mum has beaten the odds to still be here today.

Learn more


Roy and the Gamma Knife – A Happy Tale

I had headaches, almost daily, for 10 years or more. It was a rare day if I did not have a headache. I used to joke that I should own...

Learn more

Courtney’s Story of Stability

Stability. It’s a strange concept when you have what it known to be a progressive, life long illness. You hear the words, “Your tumour...

Learn more

Upcoming Events

  • 24/Jul/2018: Groupe de soutien virtuel: Un groupe de soutien virtuel pour personnes touchées par une tumeur... Learn more >
  • 25/Jul/2018: Toronto Support Group: Meets at Wellspring Westerkirk House at Sunnybrook, Toronto, ON... Learn more >
  • 29/Jul/2018: 11th Annual Black Diamond Car Show Presented by Thumbs Up: Black Diamond, AB... Learn more >
  • 02/Aug/2018: Ajax Support Group: Meets at St. Paul's United Church, 65 King's Crescent, Ajax, ON... Learn more >
View All Events >
Thank you to the donors whose contributions make this website and all programs, services and research possible.

Copyright © 2018 Brain Tumour Foundation of Canada. Charitable Registration #BN118816339RR0001