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Neutron capture therapy beams at the MIT Research Reactor
J R Choi1, S D Clement, O K Harling
1Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge.
Basic Life Sciences
|January 1, 1990
Summary
Neutron beams at MITR-II show promise for neutron capture therapy. Optimized beams effectively treat shallow and deep brain tumors like glioblastoma multiforme.
Area of Science:
- Medical Physics
- Radiation Oncology
- Nuclear Engineering
Background:
- Neutron capture therapy (NCT) is an advanced radiation treatment modality.
- Glioblastoma multiforme and other brain tumors require precise radiation delivery.
- The Massachusetts Institute of Technology Research Reactor (MITR-II) offers potential neutron sources for NCT.
Purpose of the Study:
- To dosimetrically characterize neutron beams at MITR-II for NCT.
- To evaluate the suitability of these beams for treating brain tumors.
- To assess therapeutic potential based on depth and dose ratios.
Main Methods:
- Characterization of filtered neutron beams (Cd, D2O, 6Li, Bi) and epithermal beams (Al, S, Cd, 6Li, Bi).
- Measurement of dose versus depth in polyethylene phantoms.
- Calculation of therapeutic advantage depths and in-phantom dose ratios.
Main Results:
- Filtered beams offer therapeutic advantage depths of approximately 5 cm with excellent dose ratios, suitable for shallow tumors.
- Epithermal beams provide superior therapeutic advantage depths (>6 cm) with good dose ratios, enabling treatment of deeper tumors.
- Both beam types demonstrate utility for neutron capture therapy, with potential for treating tumors at any brain depth when combined with bilateral irradiation.
Conclusions:
- Neutron beams developed at MITR-II are suitable for neutron capture therapy.
- Filtered and epithermal beams offer distinct advantages for treating tumors at various depths.
- Further development of neutron beams at MITR-II is planned to enhance treatment capabilities.