Journal
RADIOTHERAPY AND ONCOLOGY
Volume 109, Issue 1, Pages 89-94Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.radonc.2013.08.041
Keywords
Lung cancer; Computed tomography; Deformable registration; Density changes; Pneumonitis; Fibrosis
Funding
- Lundbeck Foundation Center for Interventional Research in Radiation Oncology (CIRRO)
- Danish Council for Strategic Research
- Elekta
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Purpose: This study investigates the clinical radiobiology of radiation induced lung disease in terms of regional computed tomography (CT) density changes following intensity modulated radiotherapy (IMRT) for non-small-cell lung cancer (NSCLC). Methods: A total of 387 follow-up CT scans in 131 NSCLC patients receiving IMRT to a prescribed dose of 60 or 66 Gy in 2 Gy fractions were analyzed. The dose-dependent temporal evolution of the density change was analyzed using a two-component model, a superposition of an early, transient component and a late, persistent component. Results: The CT density of healthy lung tissue was observed to increase significantly (p < 0.0001) for all dose levels after IMRT. The time evolution and the size of the density signal depend on the local delivered dose. The transient component of the density signal was found to peak in the range of 3-4 months, while the density tends to stabilize at times >12 months. Conclusions: The radiobiology of lung injury may be analyzed in terms of CT density change. The initial transient change in density is consistent with radiation pneumonitis, while the subsequent stabilization of the density is consistent with pulmonary fibrosis. (C) 2013 Elsevier Ireland Ltd. All rights reserved.
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