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目的 分析普通螺旋CT重叠重建图像及多层螺旋CT较薄层厚重建图像能否增加螺旋CT检测肺结节的数目。方法 对已确诊肺结节病人进行了 4 8次胸部螺旋CT扫描 ,并进行了重叠图像重建 (普通螺旋CT)及较薄层厚图像重建 (多层螺旋CT)。两位阅片者记录肺结节的大小、数目。结果 重叠重建图像比非重叠重建图像中分辨出更多的肺结节和更多的确定的肺结节 ;3mm层厚重建图像分辨比 8mm层厚重建图像分辨更多确定的肺结节。结论 胸部螺旋CT只有在重叠重建图像及较薄层厚重建图像上才能显示更多的小于层厚的肺结节。
Objective To analyze whether spiral CT can detect the number of pulmonary nodules by analyzing the reconstructed images of common spiral CT and the images of reconstructed thin slices with multi-slice spiral CT. Methods Forty-four chest spiral CT scans were performed on patients with diagnosed pulmonary nodules. Overlapped images (plain spiral CT) and thin layer thickness image reconstruction (MSCT) were performed. Two readers to record the size of the lung nodules, the number. Results Overlapped reconstructed images identified more lung nodules and more confirmed lung nodules than non-overlapping reconstructed images; 3mm reconstructed image with a layer thickness of 8mm reconstructed images resolved more defined lung nodules than reconstructed images of 8mm thick layer. Conclusion CT in thoracic spine can display more pulmonary nodules smaller than layer thickness only in overlapping reconstructed images and reconstructed thinner layer images.