BOSTON -- A technology that's used to build cars is now being used to fight cancer.

NewsCenter 5's Heather Unruh reported that doctors at Beth Israel Deaconess Medical Center say a robotic radiation machine called Cyberknife is helping them treat hard-to-reach tumors with pinpoint accuracy.

The $6 million robot delivered invaluable treatment to cancer patient Chrissy Audibert, 31.

Accuracy is especially important for Audibert, who has two tumors very close to her eyes. A slight move in the wrong direction could severely damage her eyesight. But the Cyberknife uses two cameras and infrared technology to continually adjust where it is sending the radiation.

"It checks the position of the tumor, checks the position of the patient, adjusts for any movement -- patient movement or tumor movement and then delivers the treatment accurately," said Dr. Anand Mahadevan, of Beth Israel Deaconess Medical Center.

The device allows radiologists to use higher doses of radiation without fear of damaging healthy tissue or causing uncomfortable side effects for cancer patients.

"Just like a surgeon's knife would just treat the tumor, go around the tumor alone we can use the radiation to just focus on the tumor itself," Mahadevan said.

The Cyberknife is allowing doctors to treat tumors outside the brain in hard-to-reach places like the lungs, liver and spine.

"The computer system is able to tell the robot not only where the tumor is, but where it is in relation to the breathing cycle," said Dr. Mary Ann Stevenson. "It allows us to make very, very small treatment fields because the robot breathes with the patient."

Robotic radiosurgery has been used on brain tumors for years, but patients were forced to wear a painful metal frame to keep their head in place.

"They had to screw the frame into my skull which, you can imagine, is not comfortable at all," said Audibert.

The Cyberknife doesn't need a frame and cancer patients already undergoing difficult treatments appreciate the change.

"The difference is unbelievable. You don't feel a thing," patient Barbara Boris said.

The Cyberknife is covered by most insurance plans. Right now, Beth Israel Deaconess Medical Center is the only hospital in the region using the technology.