Gronenschild E, Janssen J, Tijdens F
Department of Medical Informatics, University of Limburg, The Netherlands.
Cathet Cardiovasc Diagn. 1994 Sep;33(1):61-75. doi: 10.1002/ccd.1810330116.
The Cardiovascular Angiography Analysis System (CAAS) has been completely redesigned and transferred to a modern platform. The user-friendly environment together with a number of image processing techniques and tools allow easy and fast analysis of cardiovascular angiographic images. These images are obtained either on-line by means of a frame grabber hooked on the video output of the X-ray equipment or off-line by digitising 35-mm cine film frames. In addition, images can be acquired more directly by means of a network link. Images stored on disk in different formats, including MS-DOS, can also be analysed. Accurate and reliable quantitative analysis of coronary stenoses and assessment of their related functional significance may offer the clinician a tool in a stratification of patients at risk. The semireal-time environment will make it possible for the cardiologist to quickly respond to the results of recanalisation procedures while the patient is still in the catheterisation laboratory. The addition of a video front end makes the system available to all clinically relevant X-ray imaging equipment. A detailed comparison with the former CAAS on the basis of analysis of 40 arterial segments in routinely acquired cineangiograms demonstrated no statistically significant differences between the two analysis systems. Repeated analysis of the same segments yielded inter- and intraobserver variabilities for the obstruction diameter of 0.096 and 0.108 mm, respectively. For the computed reference diameter the values are 0.099 and 0.096 mm, respectively, and for the percentage diameter stenosis 4.67 and 5.37%, respectively.
心血管造影分析系统（CAAS）已被全面重新设计，并移植到一个现代化平台上。其用户友好的环境，连同一些图像处理技术和工具，使得对心血管造影图像进行轻松快速的分析成为可能。这些图像既可以通过连接到X射线设备视频输出端的图像采集卡在线获取，也可以通过对35毫米电影胶片帧进行数字化处理离线获取。此外，还可以通过网络链接更直接地采集图像。存储在磁盘上的不同格式（包括MS-DOS格式）的图像也可以进行分析。对冠状动脉狭窄进行准确可靠的定量分析及其相关功能意义的评估，可能会为临床医生提供一种对高危患者进行分层的工具。半实时环境将使心脏病专家在患者仍在导管室时就能迅速对再通手术的结果做出反应。增加一个视频前端，使该系统可用于所有临床相关的X射线成像设备。在对常规采集的电影血管造影中的40个动脉节段进行分析的基础上，与以前的CAAS进行详细比较，结果表明这两个分析系统之间没有统计学上的显著差异。对相同节段进行重复分析得出，观察者间和观察者内对阻塞直径的变异性分别为0.096毫米和0.108毫米。对于计算得出的参考直径，其值分别为0.099毫米和0.096毫米，对于直径狭窄百分比，分别为4.67%和5.37%。
