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为了降低放射科胶片费用,一种办法是在一张胶片上照的图像小一些,使排列的图像幅数增加。作者为调查胸部CT扫描时应用较小图像照片对肺内小结节检查准确性的影响,选用了13个胸部CT检查病人中的80个孤立层面。这些病人中没有患急性肺部疾病或癌。CT图像采用放大系数进行重建,使肺组织占满观察野(像素0.6,矩阵512×512)。选择层面通常位于肺中部。用螺旋CT进行扫描(Somatom Plus;西门子医药系统,Iselin,NJ)。曝光时间24～32s,137kVp,210mA,10mm层厚,1242投影,180°线形内插重建算法,高分辨模芯。单个合成结节位于每幅图像肺内随机部位。结节既不超出
One way to reduce the cost of radiology film is to take a smaller picture on a film and increase the number of images arranged. The authors selected 13 thoracic CT examinations of 80 isolated layers of the patient for the purpose of investigating the effect of smaller imagery on the accuracy of small nodules in the chest computed tomography. There is no acute lung disease or cancer in these patients. The CT images were reconstructed with magnification factor, making the lung tissue fill the observation field (pixel 0.6, matrix 512 × 512). The level of choice is usually located in the middle of the lung. Scanning with Spiral CT (Somatom Plus; Siemens Medical Systems, Iselin, NJ). Exposure time 24 ~ 32s, 137kVp, 210mA, 10mm layer thickness, 1242 projection, 180 ° linear interpolation reconstruction algorithm, high resolution core. A single synthetic nodule is located at each site of the lung in each image. Nodules neither go beyond