CT-based quantitative evaluation of radiation-induced lung fibrosis: a study of interobserver and intraobserver variations.
10.3857/roj.2014.32.1.43
- Author:
Jaesung HEO
;
Oyeon CHO
;
O Kyu NOH
;
Young Taek OH
;
Mison CHUN
;
Mi Hwa KIM
;
Hae Jin PARK
- Publication Type:Original Article
- Keywords:
Radiation-induced lung fibrosis;
Fibrosis volume;
Quantitative CT;
Interobserver variation;
Intraobserver variation
- MeSH:
Carcinoma, Non-Small-Cell Lung;
Evaluation Studies as Topic*;
Fibrosis*;
Follow-Up Studies;
Humans;
Lung*;
Observer Variation*;
Radiotherapy;
Thorax;
Tomography, X-Ray Computed
- From:Radiation Oncology Journal
2014;32(1):43-47
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The degree of radiation-induced lung fibrosis (RILF) can be measured quantitatively by fibrosis volume (VF) on chest computed tomography (CT) scan. The purpose of this study was to investigate the interobserver and intraobserver variability in CT-based measurement of VF. MATERIALS AND METHODS: We selected 10 non-small cell lung cancer patients developed with RILF after postoperative radiation therapy (PORT) and delineated VF on the follow-up chest CT scanned at more than 6 months after radiotherapy. Three radiation oncologists independently delineated VF to investigate the interobserver variability. Three times of delineation of VF was performed by two radiation oncologists for the analysis of intraobserver variability. We analysed the concordance index (CI) and inter/intraclass correlation coefficient (ICC). RESULTS: The median CI was 0.61 (range, 0.44 to 0.68) for interobserver variability and the median CIs for intraobserver variability were 0.69 (range, 0.65 to 0.79) and 0.61(range, 0.55 to 0.65) by two observers. The ICC for interobserver variability was 0.974 (p < 0.001) and ICCs for intraobserver variability were 0.996 (p < 0.001) and 0.991 (p < 0.001), respectively. CONCLUSION: CT-based measurement of VF with patients who received PORT was a highly consistent and reproducible quantitative method between and within observers.
