Cerebral radiation surgery using moving field irradiation at a linear accelerator facility

Area of Science:

• Medical Physics
• Neurosurgery
• Radiation Oncology

Background:

• Brain radiation surgery requires precise targeting to maximize dose to the target volume while minimizing exposure to surrounding healthy tissue.
• Conventional techniques may face limitations in achieving optimal dose conformity for complex brain targets.

Purpose of the Study:

• To describe a modified irradiation technique for radiation surgery within the brain using a linear accelerator.
• To evaluate the feasibility and precision of this novel technique.

Main Methods:

• Implementation of several moving field irradiations in non-coplanar planes.
• Utilization of collimated narrow beams, a specialized localization system, and computer programs for precise patient positioning.
• Development of a simple treatment planning algorithm based on computed tomography (CT) images.

Main Results:

• Achieved a high concentration of radiation dose within small, well-circumscribed volumes.
• Dose distributions were validated through experimental studies and computational analysis.
• Demonstrated technical feasibility of performing brain radiation surgery at the linear accelerator facility.

Conclusions:

• The modified irradiation technique enables precise and effective radiation surgery for brain conditions.
• The developed method allows for conformal dose delivery, enhancing therapeutic outcomes.
• Successful treatment of seventeen patients confirms the clinical viability of this approach.