[The physical and technical outlook for neutron therapy in Germany]

Area of Science:

• Medical Physics
• Radiation Oncology
• Nuclear Medicine

Background:

• Germany operates five fast neutron therapy centers, all utilizing older, low-energy cyclotrons or neutron generators.
• These facilities represent the lower end of energy capabilities among the 21 neutron therapy centers globally.
• Current equipment limitations include suboptimal depth dose characteristics compared to Cobalt-60 gamma rays and insufficient absorbed dose rates.

Purpose of the Study:

• To survey the current status of neutron therapy in Germany, including statistical and methodical data.
• To highlight the limitations of existing equipment in achieving optimal treatment outcomes.
• To provide recommendations for modernizing German neutron therapy facilities.

Main Methods:

• A comprehensive survey of statistical and methodological data from German neutron therapy centers was conducted.
• Comparison of technical capabilities and treatment parameters with modern radiotherapy standards was performed.
• Analysis of equipment limitations, including energy levels, dose rates, and availability of advanced features.

Main Results:

• German neutron therapy centers predominantly use low-energy cyclotrons/generators, limiting treatment capabilities.
• Technical restrictions are evident due to the absence of modern features like multileaf collimators and full gantry rotation.
• The current infrastructure may mask the biological advantages of high Linear Energy Transfer (LET) neutron irradiation.

Conclusions:

• Modernization of outdated neutron therapy facilities in Germany is urgently required.
• Upgrading equipment is essential to overcome suboptimal performance and fully utilize the therapeutic potential of neutron therapy.
• Implementing modern radiotherapy features will enhance treatment precision and efficacy for specific tumor types.