Small simulated polyps in pig colon: sensitivity of CT virtual colography.
Small simulated polyps in pig colon: sensitivity of CT virtual colography.
复制标题
猪结肠模拟小息肉：CT 虚拟结肠成像的敏感性。
作者：
A. Dachman;J. Lieberman;R. Osnis;S Y Chen;K. Hoffmann;C. T. Chen;G. Newmark;J. McGill
目的
作者评价了在理想条件下用于检测模拟息肉的计算机断层扫描(CT)虚拟造影术，以及(A)准直、(B)平台间距和(C)结肠腔相对于支架的方向对病变显着性的影响。
材料和方法
切除和清洗猪结肠，形成直径分别为3、7和10 mm的息肉。每个标本的准直为5 mm和7 mm，工作台间距为1.0、1.6和2.0，与台架成0度、45度和90度角。以1 mm的间隔重建初始二维(2D)图像(2D重建)，由此生成三维(3D)虚拟COLOGRY图像。息肉在初始和重建的2D图像和3D重建图像上的显着性以三分制进行评估：0=息肉没有被描绘，1=息肉模糊被描绘，2=息肉被清楚地描绘。
结果
直径10 mm的息肉在每个初始和重建的2D图像和3D重建上都被清楚地描绘出来(2级明显)，而不考虑准直度、工作台间距或与支架的角度。直径7 mm的息肉在每个初始和重建的2D图像上都能清晰地显示(2级明显)，但3D重建的明显程度随成像参数的变化而变化。直径为3 mm的息肉在初始和重建的2D图像和3D图像上显示模糊(1级明显)，但3D重建的明显程度随成像参数的变化而变化。
结论
CT虚拟结肠造影术有助于发现微小的粘膜息肉，而不考虑结肠腔与获取息肉的支架的夹角。
PURPOSE
The authors evaluated computed tomographic (CT) virtual colography for the detection of simulated polyps under ideal conditions, as well as the effects on lesion conspicuity of (a) collimation, (b) table pitch, and (c) orientation of the colon lumen with respect to the gantry.
MATERIALS AND METHODS
Pig colon was resected and cleansed, and polyps with diameters of 3, 7, and 10 mm were created. Each specimen was scanned with collimation of 5 and 7 mm and table pitch of 1.0, 1.6, and 2.0 at angles of 0 degrees, 45 degrees, and 90 degrees to the gantry. The initial two-dimensional (2D) images were reconstructed at 1-mm intervals (2D reconstructions), from which three-dimensional (3D) virtual colography images were generated. Polyp conspicuity on the initial and reconstructed 2D images and the 3D reconstructions was evaluated on a three-point scale: 0 = polyp not depicted, 1 = polyp faintly depicted, and 2 = polyp clearly depicted.
RESULTS
The 10-mm-diameter polyp was clearly depicted (grade 2 conspicuity) on every initial and reconstructed 2D image and 3D reconstruction without regard to collimation, table pitch, or angle to the gantry. The 7-mm-diameter polyp was clearly depicted (grade 2 conspicuity) on every initial and reconstructed 2D image, but conspicuity on 3D reconstructions varied as the imaging parameters varied. The 3-mm-diameter polyp was faintly depicted (grade 1 conspicuity) on the initial and reconstructed 2D images and 3D reconstructions, but conspicuity varied on the 3D reconstructions as the imaging parameters varied.
CONCLUSION
CT virtual colography helped detection of small mucosal polyps regardless of the angle of the colon lumen to the gantry at which they were obtained.