胃癌ADC全容积直方图组间和组内观察者可重复性研究
Journal of Medical Imaging(2017)
Abstract
目的 评估胃癌ADC全容积直方图组间和组内观察者一致性.方法 70例经胃镜病理证实为胃癌的患者于术前行DW-MRI.在ADC图的每个层面勾画肿瘤轮廓,最终获得整个肿瘤全容积直方图.直方图参数包括ADCmean, standard deviation, max frequency, mode, ADCmin, ADCmax, 5th-90th percentile ADC等.计算一致性相关系数(intraclass correlation coefficient, ICC)分析各直方图参数组间和组内观察者一致性.结果 两位医师的组内观察者一致性及其组间观察者一致性均较好.医师1诊断的组内一致性结果为:perfect:5个参数,excellent:8个参数,very good :2个参数,good :1个参数.医师2诊断的组内一致性结果为:perfect:1个参数,excellent:8个参数,very good :4个参数,good :3个参数.两者组间一致性结果为perfect:5个参数,excellent:8个参数,very good :3个参数.结论 ADC全容积直方图参数的组内和组间观察者一致性较好,可用于评估胃癌,尤其是10th, 25th, 50th percentile ADC,sample number 和ADCmean.
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Key words
Magnetic resonance imaging,Stomach neoplasm,Histogram,Reproducibility
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