Now University of Virginia (UVA) is offering the latest and most advanced technology in stereotactic radiosurgery, called Gamma Knife eXtend, which allows physicians to treat larger tumours, multiple tumours and tumours near sensitive structures like the brainstem, facial nerves or the optic nerve. UVA's Lars Leskell Center for Gamma Knife Radiosurgery is the first in the United States and the second worldwide to offer the eXtend system.
"This technology expands our ability to treat patients with radiosurgery in ways we would not have thought possible five or 10 years ago", stated Jason Sheehan, MD, PhD, FACS, associate professor of neurosurgery and radiation oncology at the UVA School of Medicine. Jason Sheehan, co-director of the Center for Gamma Knife Radiosurgery, conducted radiosurgery using the eXtend system in mid-January. This was the first stereotactic radiosurgery of this type in the nation.
UVA neurosurgeons and radiation oncologists are pioneers in this field and have used Gamma Knife technology on more than 7000 patients. Specialists from around the world come to UVA Health System to train with Jason Sheehan and other UVA physicians.
Gamma Knife technology uses Gamma rays to deliver an intense, highly focused dose of radiation to the area targeted for treatment. The procedure is combined with sophisticated three-dimensional imaging, such as functional imaging MRI or PET scan, and computer-aided treatment planning. Neurosurgeons first scan the brain by MRI or CT to locate the tumour and then use the Gamma Knife to focus 192 radiation beams precisely on the target.
Patients remain awake throughout the procedure in a room equipped with video monitoring and two-way voice contact. A single procedure takes 15 to 40 minutes, enabling patients to go home the day of surgery. Patients can resume normal activities that same day.
The eXtend system's relocatable frame permits extremely high accuracy and precision over multiple sessions. A customized mouthpiece and headrest stabilizes and positions the patient's head comfortably. The mouthpiece and headrest are reapplied in each of the sessions to treat the entire area.
"The idea of the eXtend system is to afford a very comfortable and accurate way for the patient to get radiosurgery multiple times if needed. This is ideal for patients with tumours that are too big for conventional radiosurgery or for those with tumours that are too close to adjacent structures that you could not treat with traditional radiosurgery", Jason Sheehan stated.
"While the eXtend system broadens the potential for stereotactic radiosurgery to treat patients, others who are not candidates for the eXtend system can often be treated with the traditional Gamma Knife Perfexion technology", stated James Larner, MD, professor and chair of radiation oncology at the UVA School of Medicine. "Alternately, other surgical or radiation therapy techniques at UVA may be more appropriate."
Gamma Knife technology effectively treats tumours that arise in or spread to the brain, such as acoustic neuromas, meningiomas, astrocytomas and metastatic tumours. Conventional brain surgery with a scalpel exposes the brain to a number of risks that Gamma Knife helps avoid, such as long hospital stays; lengthy rehabilitation; damage to healthy brain tissue; surgical complications such as haemorrhage, infection or cerebral spinal fluid leak; general anaesthesia dangers; and other physical trauma and disruption of normal brain function.
For more information on the eXtend system at the University of Virginia Health System, you can visit the UVA Gamma Knife website.