面向Web的远程图像可视化系统的研制  

DEVELOPMENT OF WEB-ORIENTED REMOTE IMAGE VISUALIZATION SYSTEM

作　　者：刘兆明 郭景 柯永振[1] Liu Zhaoming;Guo Jing;Ke Yongzhen(School of Computer Science and Software Engineering, Tianjin Polytechnic University, Tianjin 300387, China)

机构地区：[1]天津工业大学计算机科学与软件学院,天津300387

出　　处：《计算机应用与软件》2018年第6期190-196,262,共8页Computer Applications and Software

基　　金：天津市科技重大专项与工程项目(15ZXHLGX00300)

摘　　要：当前主流医学影像可视化系统都是基于平台或可视化插件,难以实现跨平台及远程访问。然而由于WebGL功能越来越强大,它可以通过调用显卡的计算资源,轻松创建高性能计算机图形。基于这个原因提出并实现了基于HTML5和WebGL的面向浏览器的医学图像可视化系统。基于B/S模式设计系统整体架构,提供DICOM格式医学影像可视化服务。系统通过采用Fetch API中Global Fetch.Fetch()方法实现远程数据获取并通过Promise对象进行异步传输图像,利用WebGL对硬件加速的支持,在浏览器端实时绘制二维医学图像和运用光线投射算法进行三维重建,采用加速度步长确定采样点以及不透明度提前截止法来提高光线投射重建速度。在不同的浏览器、多组临床DICOM影像上测试了此系统,表明系统支持跨浏览器可视化。测试二维和三维可视化结果表明:系统支持医学影像体数据的二维实时可视化以及相关的交互操作,同时支持基于光线投射的直接体绘制可视化以及相关交互操作。在系统中,提出一个基于Web的软件解决方案来解决医学影像可视化的问题,实现了对医学影像的浏览器访问。该系统不需要任何可视化插件,在不同操作系统平台上,用户都可以通过浏览器操作远程医学图像体数据。At present,mainstream medical imaging visualization systems are based on the platform or visual plug-ins.It is difficult to achieve cross-platform and remote access. However,as the WebGL function becomes more and more powerful,it can easily create high-performance computer graphics by calling the Graphics card computing resources. For this reason,we proposed and implemented browser-oriented medical image visualization system based on HTML5 and WebGL. Our system provided DICOM format medical image visualization services. The design of system architecture was based on the B/S model. The system used the Global Fetch. Fetch（） method in Fetch API to achieve remote data acquisition and transmitted images asynchronously through the promise objects. The system used WebGL to support hardware acceleration, rendering two-dimensional medical images and using the ray projection algorithm for 3 D reconstruction at the browser side. In this paper,the acceleration step was used to determine the sampling point and the opacity advance cutoff method to improve the light projection reconstruction speed. The system was tested on different browsers and multiple clinical DICOM images,indicating that the system supports cross-browser visualization. The testing of two-dimensional and three-dimensional visualization results showed that the system can support two-dimensional real-time visualization of medical image data and related interworking, and supported direct volume rendering visualization and partial interaction based on ray casting. In this system,a web-based software solution is proposed to solve the problem of medical image visualization,and browser access to medical is realized. The system not requires anyvisual plug-ins. On different operation system platforms,users can manipulate remote medical image data through the browser.

关 键 词：医学图像 B/S WEBGL 可视化 HTML5 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]