Koning G, van der Zwet P M, von Land C D, Reiber J H
Department of Diagnostic Radiology and Nuclear Medicine, University Hospital Leiden, The Netherlands.
Int J Card Imaging. 1992;8(2):153-61. doi: 10.1007/BF01137536.
Coronary contrast catheters are almost exclusively used for calibration purposes in quantitative coronary arteriography. In this study we have assessed the suitability of new 6F and 7F Mallinckrodt nylon catheter with Softouch tip with improved imaging specifications for such calibration purposes both from digital and cinefilm images using new analytical QCA-software packages (Philips DCI/ACA and Medis CMS). The average signed differences between the angiographically measured dimensions at 100% contrast fillings and acquired at 3 different kV-levels (60, 75 and 90 kV) were -3.3% and 0.6% for the 6F and 7F catheter tips, respectively as measured with the ACA-package on digital images, and -0.4% and 2.1%, respectively, as measured with the CMS-system on cinefilm images. The pooled standard deviations were 0.102 mm and 0.107 mm for the 6F and 7F catheter tips, respectively, as measured with the ACA-package, and 0.080 mm and 0.083 mm, as measured with the CMS-system. The deviations for the nylon shafts were much larger. It became also clear that neither the filling of the catheters, nor the kV-level used, had any appreciable effect on the measurement accuracy for the Softouch tips, which facilitates the frame selection in QCA-studies. From these data it can be concluded that the nontapering parts of the 6F and 7F Mallinckrodt Softouch tips are very well suitable for QCA calibration purposes, but that the nylon shafts are not.
冠状动脉造影导管几乎仅用于定量冠状动脉造影的校准目的。在本研究中，我们使用新的分析性QCA软件包（飞利浦DCI/ACA和Medis CMS），从数字图像和电影胶片图像评估了具有改进成像规格的新型6F和7F马林克罗特尼龙导管（带Softouch尖端）用于此类校准目的的适用性。使用ACA软件包在数字图像上测量时，6F和7F导管尖端在100%造影剂充盈时血管造影测量尺寸与在3个不同kV水平（60、75和90 kV）下采集的尺寸之间的平均符号差分别为-3.3%和0.6%；使用CMS系统在电影胶片图像上测量时，分别为-0.4%和2.1%。使用ACA软件包测量时，6F和7F导管尖端的合并标准差分别为0.102 mm和0.107 mm；使用CMS系统测量时，分别为0.080 mm和0.083 mm。尼龙导管轴的偏差要大得多。同样明显的是，导管的充盈情况和使用的kV水平对Softouch尖端的测量准确性均无明显影响，这有利于QCA研究中的帧选择。从这些数据可以得出结论，6F和7F马林克罗特Softouch尖端的非锥形部分非常适合用于QCA校准目的，但尼龙导管轴不适合。
