CT画像を用いた耳小骨連鎖異常の検出 : axial像と三次元画像の比較

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The purpose of this study was to evaluate the usefulness of axial and three-dimensional imaging (virtual endoscopy) with helical CT for the detection of ossicular chain abnormalities. In 15 patients who had traumatic ossicular dislocation, disruption, and congenital ossicular defect and anomaly, axial helical CT scanning of the temporal bone was performed with GE HSA. Axial and three-dimensional imaging was carried out in normal ears (15 ears) and abnormal ears (10 ears), for the detection of ossicular chain abnormalities. Diagnostic accuracy was evaluated by receiver-operating-characteristic (ROC) curve analysis using a continuous reporting scale. Furthermore, ROC testing was done to determine the sensitivity, specificity, and accuracy of the detection of ossicular chain abnormalities. Diagnostic accuracy in the detection of ossicular chain abnormalities with three-dimensional imaging (A_z=0.967, SD=0.022) was not significantly better than that of axial imaging (A_z=0.930, SD=0.046); however, the interobserver standard deviation was better for three-dimensional imaging. Three-dimensional imaging resulted in an increase in true positive cases and a decrease in false negatives. Three-dimensional imaging also showed higher sensitivity and accuracy. In the evaluation of ossicular chain abnormalities, three-dimensional imaging (virtual endoscopy) is useful and provides additional information. Three-dimensional imaging may have an important role in diagnostic procedures and / or preoperative evaluation in otology.
社団法人日本放射線技術学会の論文
2000-05-20

CT画像を用いた耳小骨連鎖異常の検出 : axial像と三次元画像の比較

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