A superconducting cyclotron for neutron radiation therapy

Area of Science:

• Medical Physics
• Radiation Oncology
• Accelerator Technology

Background:

• Neutron therapy offers potential clinical advantages in treating certain cancers.
• Implementing advanced radiotherapy technologies in clinical settings requires detailed facility specifications.
• Superconducting cyclotrons provide a compact and efficient source for neutron generation.

Purpose of the Study:

• To present the physical and clinical specifications of a novel neutron therapy facility.
• To describe the operational aspects of a superconducting cyclotron in a hospital environment.
• To characterize the neutron beam's physical properties for clinical application.

Main Methods:

• Detailed description of the superconducting cyclotron and its support systems.
• Analysis of the helium liquifier and cryogenic system requirements and operation.
• Characterization of the neutron beam's physical properties, including depth dose and surface dose.
• Evaluation of the multirod collimator for field shaping and personnel protection.

Main Results:

• The neutron therapy facility is designed around a superconducting cyclotron.
• The neutron beam exhibits a central axis percent depth dose curve comparable to a 4 MV x-ray beam.
• Maximum dose depth is approximately 9 mm, with a surface dose of 40-45%.
• The multirod collimator enables irregular field sizes up to 26.5 x 30 cm with reduced personnel exposure.

Conclusions:

• The described neutron therapy facility, utilizing a superconducting cyclotron, is clinically viable.
• The facility's design ensures effective neutron beam delivery and patient treatment.
• The system provides safe and flexible radiation delivery for oncological applications.