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題名 | Computer-Aided Diagnosis of Cardiomegaly in Digital Chest Radiographs |
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作 者 | Tzan,Chin-shin; Fuh,Chiou-shann; Shieh,Ming-jium; | 書刊名 | 醫學工程 |
卷期 | 10:1 1998.02[民87.02] |
頁次 | 頁1-3 |
分類號 | 416.12 |
關鍵詞 | 電腦輔助診斷; 心臟擴大; 胸部X光片; Computer-aided diagnosis; Cardiomegaly; Chest radiograph; |
語文 | 英文(English) |
英文摘要 | We presented an original method to determine the cardiothoracic ratio (CTR) automatically on chest x-ray films to detect cardiomegaly. The original digital chest radiographs were segmented into several regions of interest (ROI). Horizontal and vertical projection analysis and thresholding within each ROI determined the initial and ending points of the right and the left diaphragm edges. The entire diaphragm edges were traced out by straight lines and curve fitting. The vertical tangents of the right and the left heart borders and hence the maximum transverse diameter (TD) of the heart were determined by thresholding. Finally, based on the ending points of the diaphragm edge, the lower internal thorax border was traced out; the maximum TD of the thorax determined. CTR was therefore computed by dividing the maximum TD of the heart by the maximum TD of the thorax. This algorithm was applied to 49 chest radiographs and the acceptable correct diagnostic rate was 67%. |
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