Channin D S
Department of Radiology, Pennsylvania State University College of Medicine, Hershey 17033, USA.
Acad Radiol. 1995 Dec;2(12):1052-5. doi: 10.1016/s1076-6332(05)80512-4.
Computer networks in general, and the Internet specifically, are changing the way information is manipulated in the world at large and in radiology. The goal of this project was to develop a computer system in which images from the Radiologic Learning File, available previously only via a single-user laser disc, are made available over a generic, high-availability computer network to many potential users simultaneously.
Using a networked workstation in our laboratory and freely available distributed hypertext software, we established a World Wide Web (WWW) information server for radiology. Images from the Radiologic Learning File are requested through the WWW client software, digitized from a single laser disc containing the entire teaching file and then transmitted over the network to the client. The text accompanying each image is incorporated into the transmitted document.
The Radiologic Learning File is now on-line, and requests to view the cases result in the delivery of the text and images. Image digitization via a frame grabber takes 1/30th of a second. Conversion of the image to a standard computer graphic format takes 45-60 sec. Text and image transmission speed on a local area network varies between 200 and 400 kilobytes (KB) per second depending on the network load.
We have made images from a laser disc of the Radiologic Learning File available through an Internet-based hypertext server. The images previously available through a single-user system located in a remote section of our department are now ubiquitously available throughout our department via the department's computer network. We have thus converted a single-user, limited functionality system into a multiuser, widely available resource.
一般的计算机网络，特别是互联网，正在改变全球以及放射学领域中信息处理的方式。本项目的目标是开发一个计算机系统，使放射学学习文件中的图像（以前只能通过单用户激光光盘获取）能够通过通用的高可用性计算机网络同时供许多潜在用户使用。
我们使用实验室中的联网工作站和免费的分布式超文本软件，建立了一个放射学万维网（WWW）信息服务器。通过WWW客户端软件请求放射学学习文件中的图像，从包含整个教学文件的单个激光光盘进行数字化，然后通过网络传输到客户端。每个图像附带的文本被合并到传输的文档中。
放射学学习文件现已上线，查看病例的请求会导致文本和图像的传递。通过帧捕捉器进行图像数字化需要1/30秒。将图像转换为标准计算机图形格式需要45 - 60秒。根据网络负载，局域网中的文本和图像传输速度在每秒200到400千字节（KB）之间变化。
我们已通过基于互联网的超文本服务器提供了放射学学习文件激光光盘中的图像。以前通过位于我们部门偏远区域的单用户系统才能获取的图像，现在通过部门的计算机网络在我们部门内随处可得。因此，我们将一个单用户、功能有限的系统转变为了一个多用户、广泛可用的资源。
