Rationale and Objectives. Computer networks in generalt 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. Methods. 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 leaching file and then transmitted over the network to the client. The text accompanying each image is incorporated into the transmitted document. Results. 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. Conclusion. 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 non 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.
