Converging Stereotactic Radiotherapy Using Kilovoltage X-Rays: Experimental Irradiation of Normal Rabbit Lung and Dose-Volume Analysis With Monte Carlo Simulation
- Department of Radiology, Keio University School of Medicine, Tokyo (Japan)
- CREST, Japan Science and Technology Agency, Tokyo (Japan)
- Division of Radiological Sciences, Faculty of Health Sciences, Tokyo Metropolitan University, Tokyo (Japan)
- Center for Promotion of Computational Science and Engineering, Japan Atomic Energy Agency, Ibaraki (Japan)
- Department of Anesthesiology, Keio University School of Medicine, Tokyo (Japan)
- Department of Medicine, Keio University School of Medicine, Tokyo (Japan)
- Division of Diagnostic Pathology, Keio University School of Medicine, Tokyo (Japan)
Purpose: To validate the feasibility of developing a radiotherapy unit with kilovoltage X-rays through actual irradiation of live rabbit lungs, and to explore the practical issues anticipated in future clinical application to humans through Monte Carlo dose simulation. Methods and Materials: A converging stereotactic irradiation unit was developed, consisting of a modified diagnostic computed tomography (CT) scanner. A tiny cylindrical volume in 13 normal rabbit lungs was individually irradiated with single fractional absorbed doses of 15, 30, 45, and 60 Gy. Observational CT scanning of the whole lung was performed every 2 weeks for 30 weeks after irradiation. After 30 weeks, histopathologic specimens of the lungs were examined. Dose distribution was simulated using the Monte Carlo method, and dose-volume histograms were calculated according to the data. A trial estimation of the effect of respiratory movement on dose distribution was made. Results: A localized hypodense change and subsequent reticular opacity around the planning target volume (PTV) were observed in CT images of rabbit lungs. Dose-volume histograms of the PTVs and organs at risk showed a focused dose distribution to the target and sufficient dose lowering in the organs at risk. Our estimate of the dose distribution, taking respiratory movement into account, revealed dose reduction in the PTV. Conclusions: A converging stereotactic irradiation unit using kilovoltage X-rays was able to generate a focused radiobiologic reaction in rabbit lungs. Dose-volume histogram analysis and estimated sagittal dose distribution, considering respiratory movement, clarified the characteristics of the irradiation received from this type of unit.
- OSTI ID:
- 21282049
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 75, Issue 2; Other Information: DOI: 10.1016/j.ijrobp.2009.01.085; PII: S0360-3016(09)00711-1; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The 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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