DSA视频流网络直播系统的设计与临床评价

目的 探讨DSA视频流网络直播临床应用的可行性.方法 DSA视频流由高性能的图像采集卡进行采集,利用动态图像专家组标准4(MPEG-4)压缩,结合微软的流媒体处理开发包DirectShow框架技术,通过服务器端的发送过滤器(filter)和客户端的接收filter,再利用网络传输层的传输控制协议(TCP)和用户数据报协议(UDP),实现DSA视频流的网络直播.对24例图像进行采集直播,由有经验的医师对客户端与DSA工作站的视频图像进行对比分析,主观评价每例图像的血管、病变影像特征的显示情况,以及图像的清晰度、对比度、实时有效性.结果 在100 M的局域网中,该方案直播的图像延迟时间≤1 s,24例视频图像中图像品质评价优17例,良5例,中2例.结论 该方案直播DSA视频流,图像清晰度好,延迟时间短,能够达到临床诊断与实时性要求.

Clinical evaluation and design of network live broadcast system of DSA video streaming

Objective To evaluate the clinical feasibility of network live broadcast of digital subtraction angiography(DSA)video streaming.Methods DSA video streaming was captured by an advanced image capture board.MPEG-4 and Directshow framework were used for data compression and transmission.Data of DSA video streaming could be transmitted easily from server sender filter to client receiver filter according to TCP and UDP protocols.Images of 24 cases were captured,which were compared with images of DSA workstation by experienced doctors.The subiective evaluation criteria included the manifestition of normal and pathological blood vessels,and sharpness,contrast degree and real time efficiency of images.Results The delay time of live broadcast was less than one second in 100 M LAN.Among 24 cases,excellent imaging quality was got in 17 cases,good in 5 cases and midst in 2 cases.Conclusion Excellent images and synchronism of DSA video are achieved in this system.which can meet clinical requirements of diagnosis and synchronism.