Treatment Planning for Self-Shielded Radiosurgery

Area of Science:

• Medical Physics
• Robotics Engineering
• Radiation Oncology

Background:

• Development of a novel five-degree-of-freedom robotic radiosurgery system for brain applications.
• The system is designed to be self-shielded, simplifying installation and reducing costs.
• Limited internal space necessitates specific design constraints for the linear accelerator and patient table.

Purpose of the Study:

• To conduct a preliminary investigation of achievable dose distributions with the proposed robotic radiosurgery system.
• To establish the feasibility of achieving clinically relevant dose distributions with the new design.
• To assess the potential for high dose gradients and conformity for complex target shapes.

Main Methods:

• Simulation of a five-degree-of-freedom robotic system with a 3-megavolt linear accelerator and a patient table with rotational and translational capabilities.
• Utilizing eight cone collimators with automatic changing capabilities via a collimator wheel.
• Investigating dose distributions achievable by moving the patient couch for translational repositioning, minimizing linear accelerator translational movement.

Main Results:

• Simulations indicate that the proposed robotic radiosurgery system can achieve dose gradients and conformity comparable to state-of-the-art systems.
• The design allows for precise radiation delivery to complex target shapes within the brain.
• The self-shielded, robotic approach shows promise for effective radiosurgery delivery.

Conclusions:

• The developed robotic radiosurgery system design shows potential for achieving clinically acceptable dose distributions.
• The system's self-shielded nature and robotic capabilities may enhance radiosurgery accessibility and cost-effectiveness.
• Further detailed evaluation of the system and its treatment planning capabilities is warranted.