Yamamoto Y, Yoshida S, Maeda T
Department of Radiology, Kochi Medical School.
Nihon Igaku Hoshasen Gakkai Zasshi. 1992 May 25;52(5):611-22.
Tomography was conducted for a basic study using a model of the bronchi, pulmonary arteries and veins. When the exposure angle of a tube was changed to 5, 10, 25, and 50 degrees, the width of tomograms became about 10, 4, 2, and 1 cm. When tomograms of exposure angles of 50 degrees and 10 degrees were compared, the former showed fragmentary bronchi, pulmonary arteries and veins, and the latter showed bronchi, pulmonary arteries and veins branching up, down and laterally on one image in one unit and over a wide area. Similar results were obtained in 10 cases of normal volunteer. When 25 cases of lung cancer at the hilum were studied clinically with respect to bronchial lesions, the tomograms with an exposure angle of 10 degrees could point out more lesions than the tomograms with an exposure angle of 50 degrees. In 13 cases (40 lesions) which were compared with the findings of bronchoscopy, the accuracy was only 25% in tomograms with an exposure angle of 50 degrees, and 65% in tomograms with an exposure angle of 10 degrees. These results indicate that tomograms with an exposure angle of 10 degrees are useful for analysis of the bronchi, pulmonary arteries and veins at the hilum of the lung.
使用支气管、肺动脉和肺静脉模型进行断层扫描以进行基础研究。当管的曝光角度改变为5度、10度、25度和50度时，断层图像的宽度分别变为约10厘米、4厘米、2厘米和1厘米。比较50度和10度曝光角度的断层图像时，前者显示支气管、肺动脉和肺静脉呈碎片状，而后者在一幅图像上的一个单元中以及在较宽区域内显示支气管、肺动脉和肺静脉向上、向下和横向分支。10例正常志愿者也获得了类似结果。对25例肺门肺癌患者的支气管病变进行临床研究时，10度曝光角度的断层图像比50度曝光角度的断层图像能指出更多病变。在与支气管镜检查结果进行比较的13例患者（40个病变）中，50度曝光角度的断层图像准确率仅为25%，而10度曝光角度的断层图像准确率为65%。这些结果表明，10度曝光角度的断层图像有助于分析肺门处的支气管、肺动脉和肺静脉。
