Macari M, Milano A, Lavelle M, Berman P, Megibow A J
Department of Radiology, New York University Medical Center, NY 10016, USA.
AJR Am J Roentgenol. 2000 Jun;174(6):1543-9. doi: 10.2214/ajr.174.6.1741543.
We compared the findings of time-efficient CT colonography with complete two-dimensional (2D) and three-dimensional (3D) CT colonography and conventional colonoscopy in detecting colorectal polyps.
Forty-two patients undergoing colonoscopy screening were examined with CT colonography before endoscopy. Data were examined following one of two methods. In method 1, axial 2D data sets were examined in a cine mode. If findings were suggestive of abnormality, focal areas were examined with 3D CT colonography. In method 2, data sets were examined exactly as in method 1, and subsequent to that review, data sets were examined with simultaneous 3D "fly-through" CT colonography (surface-rendered images) and multiplanar reformatted images. The time required to examine CT colonography using each technique was recorded and abnormal findings were documented. Results of methods 1 and 2 were compared with findings on colonoscopy.
Colonoscopy detected 16 polyps in 13 patients (polyp size, 2-10 mm). Ten polyps measured 5 mm or less, five measured between 6 and 9 mm, and one measured 10 mm or more. Using method 1, two of 10 polyps measuring less than 5 mm, three of five polyps measuring between 6 and 9 mm, and one polyp measuring 10 mm were detected. We noted no false-positive polyps. Average evaluation time was 16 min. With method 2, the same polyps were seen as with method 1. No additional polyps were detected, and the average evaluation time was 40 min.
Axial 2D CT colonography can be performed quickly and is comparable with complete 2D and 3D CT colonography in detecting colorectal polyps.
我们比较了高效CT结肠成像与完整二维（2D）和三维（3D）CT结肠成像以及传统结肠镜检查在检测结直肠息肉方面的结果。
42例接受结肠镜筛查的患者在进行内镜检查前接受了CT结肠成像检查。数据按照两种方法之一进行检查。在方法1中，以电影模式检查轴向2D数据集。如果发现提示异常，则用3D CT结肠成像检查局部区域。在方法2中，数据集的检查方式与方法1完全相同，在此检查之后，用同步3D“飞越”CT结肠成像（表面渲染图像）和多平面重组图像检查数据集。记录使用每种技术检查CT结肠成像所需的时间，并记录异常发现。将方法1和方法2的结果与结肠镜检查结果进行比较。
结肠镜检查在13例患者中检测到16个息肉（息肉大小为2 - 10毫米）。10个息肉直径为5毫米或更小，5个直径在6至9毫米之间，1个直径为10毫米或更大。使用方法1，检测到10个直径小于5毫米的息肉中的2个、5个直径在6至9毫米之间的息肉中的3个以及1个直径为10毫米的息肉。我们未发现假阳性息肉。平均评估时间为16分钟。使用方法2，与方法1发现的息肉相同。未检测到额外的息肉，平均评估时间为40分钟。
轴向2D CT结肠成像可以快速进行，并且在检测结直肠息肉方面与完整的2D和3D CT结肠成像相当。
