Correction to BrainSCAN central axis dose calculations for 6-MV photon beams to lung with lateral electron disequilibrium
- Department of Radiotherapy and Radiooncology, Medical Faculty and University Clinic Carl Gustav Carus, Technical University Dresden, Dresden (Germany)
Purpose: To develop and evaluate a correction method for lateral electron disequilibrium and tissue inhomogeneities in lung tissues applicable to the BrainSCAN treatment planning system. Methods and Materials: Four noncoplanar 6-MV photon beams with different beam diameters were applied to the right lung of a thorax phantom. The measured/calculated dose value ratio was evaluated as a function of a parameter that describes the degree of the lateral electron disequilibrium based on the primary dose. Results: The dose ratio showed a clearcut linear dependency on the disequilibrium parameter. Applying the proposed correction method, only minor differences between the measured and calculated doses were found for lesions >1 cm. However, for lesions <1 cm surrounded by lung tissue the difference was {<=}15%. Conclusion: The data have indicated a relevant magnitude of the correction factor only for lung lesions <1 cm.
- OSTI ID:
- 20850202
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 66, Issue 4; Other Information: DOI: 10.1016/j.ijrobp.2006.03.067; PII: S0360-3016(06)02648-4; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0360-3016
- Country of Publication:
- United States
- Language:
- English
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