University Hospital La Timone used Leksell Gamma Knife Icon to treat patients with metastases

27 August 2015 (Last Updated August 27th, 2015 18:30)

Doctors at France's University Hospital La Timone have used Elekta's latest generation cranial radiosurgery system to treat patients with metastasis in the brain.

Doctors at France's University Hospital La Timone have used Elekta's latest generation cranial radiosurgery system to treat patients with metastasis in the brain.

The new Leksell Gamma Knife Icon system's advanced motion management and imaging capabilities were harnessed by physicians to treat a total of 33 patients using either frame-based or frameless methods.

According to physicians, the Icon system will lead to a significant rise in the volume of patients suitable for frameless gamma knife radiosurgery.

"Because the patient is never precisely in the same position as in these first scans, you acquire a new CBCT scan."

The system is said to allow management of patient motion by offering an integrated cone-beam CT (CBCT) workflow, and will also enable accurate reproduction of the patient's position in hypofractionated treatments during radiosurgery.

Following custom fitting of a thermoplastic mask to the patient's head, an initial CBCT is performed to obtain a reference image, which is then fused with an MRI image to help the clinician develop a plan. The patient is then placed on a treatment couch with the mask.

University Hospital La Timone Gamma Knife programme director Jean Régis said: "Because the patient is never precisely in the same position as in these first scans, you acquire a new CBCT scan.

"In a few seconds, the GammaPlan software automatically adapts the plan to the new position of the patient's head and displays the dose distribution before and after this automated recalculation.

"This allows the physician to identify any discrepancies between the initial plan and the recalculated plan according to the new patient position."

During treatment, patient motion is managed through the high-definition motion management system that monitors the patient's head position through infrared tracking of markers.

The hospital launched legacy frame-based gamma knife radiosurgery treatments with Icon in mid-July.