Evaluation of Dose Distribution in Lung Tumor Radiotherapy with Boron Neutron Capture Therapy

Document Type : Original Paper

Authors

1 Department of Medical Physics, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Department of Radiotherapy and Radiation Oncology, Golestan Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

2 Department of Medical Physics, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

3 Ahvaz Jundishapur University of Medical Sciences

4 Department of Clinical Oncology, Faculty of Medicine, Golestan Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

Abstract

Introduction: It is well known that neutrons are more effective treatments than photons to treat hypoxic tumors due to the interaction with the nucleus and the production of heavy particles. This study aimed to evaluate the suitability of Boron neutron capture therapy (BNCT) for the treatment of lung cancer. To this end, neutron dose distributions were calculated in lung tumor volume and peripheral organs at risk (OARs).
Material and Methods: Dose distribution to treat lung cancer was calculated by MCNPX code.  An elliptical tumor with a volume of 27cm3 was centered in the left lung of the ORNL phantom and was irradiated with neutron spectrums of Massachusetts Institute of Technology (MIT) and CNEA-MEC. The tumor was loaded with different concentrations of Boron 0, 10, 30, and 60 ppm to evaluate the delivered dose to OARs. Results: Neutron absorbed dose rates in the tumor were 2.2×10-3, 2.6×10-3, 3.4×10-3, and 4.7×10-3 Gy/s for boron concentrations of 0, 10, 30, and 60 ppm, respectively for MIT. Moreover, similar results for CNEA-MEC were 1.2×10-3, 1.6×10-3, 2.5×10-3, and 3.7×10-3 Gy/s. The heart absorbed the maximum neutron dose rate of 1.7×10-4 and 1.6×10-4 Gy/s in MIT and CNEA, respectively. For all energy bins of spectrums, the neutrons flux is decreased as it penetrates the lung.
Conclusion: An increase in boron concentrations in tumors increases the absorbed doses while deteriorates dose uniformity. The results show that the MIT source is well suited to treat deep lung tumors while maintaining the OARs’ dose within the threshold dose.

Keywords

Main Subjects

References

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Iranian Journal of Medical Physics
Volume 18, Issue 1
January and February 2021
Pages 63-69

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History

  • Receive Date: 13 June 2019
  • Revise Date: 01 September 2019
  • Accept Date: 22 December 2019

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