Kamimura R, Takashima T, Kobayashi T, Kifune K
Department of Radiology, Kanazawa University.
Nihon Igaku Hoshasen Gakkai Zasshi. 1996 Mar;56(4):173-7.
More sensitive imaging methods may be required in the screening of early peripheral lung cancer. Among new radiologic techniques, helical volumetric computed tomography (CT) seems to be attractive. The image quality of helical CT with single breath-hold and low-dose technique (screening CT) was compared with conventional sequential CT in 12 patients to detect the pulmonary metastases. The screening CT protocol consisted of a 20 mm/sec table feed during a 20-second breath-hold at 40 mA, with reconstruction of images at 10 mm intervals. Conventional CT was performed with a 1-second scan time, 200 mA, and contiguous 10 mm-thick sections. In the evaluation of mediastinal vessels, bronchi and pulmonary nodules, screening CT showed high detectability images comparable to conventional CT. But subsegmental bronchi or small nodules overlapping pulmonary vessels were more difficult to visualize by screening CT because of image noise. The authors conclude that although further improvement is necessary, screening CT of the lung is an attractive new application of CT.
在早期周围型肺癌的筛查中可能需要更敏感的成像方法。在新的放射技术中，螺旋容积计算机断层扫描（CT）似乎很有吸引力。将12例患者的单次屏气低剂量技术螺旋CT（筛查CT）的图像质量与传统序列CT进行比较，以检测肺转移灶。筛查CT方案包括在40 mA下屏气20秒期间以20 mm/秒的床速进床，并以10 mm间隔重建图像。传统CT以1秒扫描时间、200 mA和连续10 mm厚的层面进行。在纵隔血管、支气管和肺结节的评估中，筛查CT显示出与传统CT相当的高可检测性图像。但由于图像噪声，筛查CT更难显示亚段支气管或与肺血管重叠的小结节。作者得出结论，尽管仍需进一步改进，但肺部筛查CT是CT一项有吸引力的新应用。
