AI Article Synopsis
- Photon beams in high-energy IMRT treatments (>10 MV) are contaminated with neutrons, which affects the risk estimates for radiotherapy.
- Neutron doses were measured using a specialized magnesium and boron-coated chamber system within a solid water phantom, analyzing four different treatment plans.
- The study found neutron doses of 1-2 mGy over the treatment and determined that none of the plans exceeded 50 mSv for the whole treatment, indicating a relatively safe whole body dose due to uniform neutron distribution.
Article Abstract
Background And Purpose: Photon beams used in IMRT treatments with high energies (>10 MV) are contaminated with neutrons. Measurement of this neutron dose is of significance to the overall risk estimate of high energy radiotherapy.
Materials And Methods: For measuring neutron doses a paired magnesium and boron coated magnesium chamber system was used. All measurements were performed inside the solid water phantom EasyCube using abdominal extensions. 4 different clinical treatment plans were studied.
Results: The measured neutron dose showed to be homogeneous inside the phantom and increased with increased number of applied monitor units. The sum over all fractions showed neutron doses of 1-2 mGy, depending on the kind of treatment.
Conclusions: Using large conversion factors of 25 Sv/Gy, none of the studied treatment plans exceeded dose equivalents of 50 mSv for the whole treatment. This dose equivalent has to be considered whole body dose due to the homogeneous distribution of neutrons.
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| http://dx.doi.org/10.1016/j.radonc.2007.10.033 | DOI Listing |
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