Distance collaboration system using moving images.

本研究报告了使用个人计算机和ISDN线路的移动图像协作系统，并检查了该系统的图像质量和可用性。在个人计算机（PC机（MPU: Intel P3-933 MHz; RAM: 768 MB; HD: 18 GB×2））上记录的医学运动图像数据事先通过ISDN网络传输，并存储在接收PC机的硬盘上。超声心动图视频图像和冠状动脉造影图像通过Dx video - acq进行模数转换，并通过网络发送到PC并保存。DxMM使用每台PC硬盘上的数据执行同步的平滑视频图像再生，并且可以实现双向图像再生、停止运动和通过屏幕上的箭头指向显示。运动图像经过40%的压缩和AD转换，以30帧/秒的速度在PC上捕获为数字化数据。单色20秒图像捕获的文件大小为10.8 MB，类似的24位彩色图像的文件大小为12.7 MB。然后，数据通过ISDN网络传输到另一台PC。这些图像每个需要13到14分钟的传输时间。在PC上重新生成冠状动脉造影，并由4名不了解患者信息的研究者分别检查冠状动脉狭窄。在中度至高度狭窄上有密切的一致。这种水平的图像质量足以用于诊断。当在视频会议系统上进行讨论时，能够重播替代视频图像，这使得该工具在确定治疗过程中非常有用。当检查二尖瓣狭窄和返流患者的图像时，获得了匹配的读数。即使使用ISDN，只要事先将移动图像数据传输到咨询伙伴的PC上，协作是可能的。

This study reports on the collaboration system for moving images using personal computers and ISDN lines, and examines the image quality and usability of the system. Medical moving image data recorded on a personal computer (PC(MPU : Intel P3-933 MHz ; RAM : 768 MB ; HD : 18 GB×2)) were transmitted beforehand over the ISDN network, and were stored on the hard disk of the recipient PC. Echocardiographic video images and coronary cineangiogram were subjected to analog-to-digital conversion by the Dx Video-Acq, and sent over the network to the PC where they were saved. The DxMM performed synchronized smooth video image regeneration using the data on the hard disk of each PC, and bidirectional image regeneration, stop motion, and pointing display via an on-screen arrow were possible.Moving images were captured as digitized data on a PC after 40% compression at 30 frames/sec and AD conversion. The file size of a monochrome, 20 second image capture was 10.8 MB, and a similar 24-bit color image was 12.7 MB. Then, the data were transmitted to the other PC over the ISDN network. These images each required a transmission time of 13 to 14 min.The coronary cineangiogram was regenerated on the PC, and four investigators who were blinded to the patient information separately examined the coronary arterial stenosis. There was close agreement on an intermediate to high degree of stenosis. This level of image quality was adequate for diagnosis. The ability to replay alternate video images while a discussion was held on the video conferencing system made this tool useful in determining a course of treatment. When the images of the mitral valve stenosis and regurgetation patient were examined, matching readings were obtained.Collaboration is possible insofar as moving image data are transmitted to the consulting partner's PC beforehand, even when ISDN is used.