But the gamma knife appears to be safer, he says.

The Gamma Knife was brought to the hospital in 2005.

The beam is wider and less accurate than that of the gamma knife.

The gamma knife showed that a directed energy source could be an effective treatment for brain tumors.

That growth will be treated by a gamma knife, a 20-ton machine in a lead-lined room.

These systems differ from the Gamma Knife in a variety of ways.

It is known for neurosurgery and was one of the first centres in Canada to use the gamma knife.

Now the gamma knife performs neurological surgery without the scapel.

Many patients tell us they prefer the gamma knife because of the favorable results and the fact that there is no incision," he says.

The pressures sometimes remind him of undergoing cancer treatment a few years ago from a radiological "gamma knife" pointed at his head.