Protecting a CT simulator room to accommodate a cyberknife facility.

Area of Science:

• Medical Physics
• Radiation Oncology
• Radiotherapy Engineering

Background:

• The Hermitage Medical Clinic planned to implement CyberKnife stereotactic treatments in 2012.
• Planning restrictions necessitated integrating the new facility into the existing hospital blueprint, utilizing an unused CT simulation room.

Purpose of the Study:

• To detail the design considerations for a radiotherapy bunker accommodating a CyberKnife system.
• To address the unique radiation shielding challenges posed by the CyberKnife's unfiltered beam and high treatment doses.

Main Methods:

• The CyberKnife's beam characteristics (unfiltered, multi-directional) dictated the need for primary barriers on all walls.
• The roof shielding was designed to mitigate significant leakage radiation from high Monitor Units (MUs).
• A combination of materials including steel, lead, normal concrete, and heavy concrete was employed to achieve required dose constraints.

Main Results:

• The design successfully integrated the CyberKnife facility within spatial limitations.
• The multi-material shielding approach met the stringent dose constraints set by Irish licensing authorities.
• The bunker design departed from conventional radiotherapy bunkers due to CyberKnife's specific operational requirements.

Conclusions:

• Innovative shielding solutions are feasible for integrating advanced radiotherapy technologies like CyberKnife into existing healthcare facilities.
• Careful consideration of beam physics and material properties is crucial for effective radiation protection in specialized treatment rooms.
• The project demonstrates a successful approach to radiation safety compliance for novel radiotherapy equipment within space-constrained environments.