Growing Region Segmentation Software (GRES) for quantitative magnetic resonance imaging of multiple sclerosis: intra- and inter-observer agreement variability: a comparison with manual contouring method

被引:18
作者
Parodi, RC [1 ]
Sardanelli, F
Renzetti, P
Rosso, E
Losacco, C
Ferrari, A
Levrero, F
Pilot, A
Inglese, M
Mancardi, GL
机构
[1] Univ Genoa, Dept Radiol, I-16132 Genoa, Italy
[2] Univ Genoa, Dept Neurol, I-16132 Genoa, Italy
[3] Osped San Martino Genova, Dept Phys Med, I-16132 Genoa, Italy
关键词
multiple sclerosis; brain MRI; intra- and inter-observer agreement; lesion volume measurements;
D O I
10.1007/s003300100978
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Lesion area measurement in multiple sclerosis (MS) is one of the key points in evaluating the natural history and in monitoring the efficacy of treatments. This study was performed to check the intra- and inter-observer agreement variability of a locally developed Growing Region Segmentation Software (GRES), comparing them to those obtained using manual contouring (MC). From routine 1.5-T MRI study of clinically definite multiple sclerosis patients, 36 lesions seen on proton-density-weighted images (PDWI) and 36 enhancing lesion on Gd-DTPA-BMA-enhanced T1-weighted images (Gd-T1WI) were randomly chosen and were evaluated by three observers. The mean range of lesion size was 9.9-536.0 mm(2) on PDWI and 3.6-57.2 mm(2) on Gd-T1WI. The median intra- and inter-observer agreement were, respectively, 97.1 and 90.0 % using GRES on PDWI, 81.0 and 70.0% using MC on PDWI, 88.8 and 80.0% using GRES on Gd-T1WI, and 85.8 and 70.0% using MC on Gd-T1WI. The intra- and inter-observer agreements were significantly greater for GRES compared with MC (P < 0.0001 and P = 0.0023, respectively) for PDWI, while no difference was found between GRES an MC for Gd-T1WI. The intra-observer variability for GRES was significantly lower on both PDWI (P = 0.0001) and GdT1WI (P = 0.0067), whereas for MC the same result was found only for PDWI (P = 0.0147). These data indicate that GRES reduces both the intra- and the inter-observer variability in assessing the area of MS lesions on PDWI and may prove useful in multicentre studies.
引用
收藏
页码:866 / 871
页数:6
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