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1 From the Department of Diagnostic Radiology, University of Utah School of Medicine, 50 N Medical Dr, Salt Lake City, UT 84132 (R.H.W., H.R.H.); the Electronic Medical Education Resource Group, Center for Advanced Medical Technologies, University of Utah School of Medicine, Salt Lake City (R.H.W., H.C.D., H.R.H., J.R.L., P.A.G.); and the Department of Diagnostic Radiology, Salt Lake City VA Medical Center, Salt Lake City, Utah (H.C.D.). Received July 17, 2000; revision requested September 27 and final revision received February 2, 2001; accepted February 20. Address correspondence to R.H.W. (e-mail: richard.wiggins@hsc.utah.edu).
Despite the rapid growth of the Internet for storage and display of World Wide Web–based teaching files, the available image file formats have remained relatively limited. The recently developed portable networks graphics (PNG) format is versatile and offers several advantages over the older Internet standard image file formats that make it an attractive option for digital teaching files. With the PNG format, it is possible to repeatedly open, edit, and save files with lossless compression along with gamma and chromicity correction. The two-dimensional interlacing capabilities of PNG allow an image to fill in from top to bottom and from right to left, making retrieval faster than with other formats. In addition, images can be viewed closer to the original settings, and metadata (ie, information about data) can be incorporated into files. The PNG format provides a network-friendly, patent-free, lossless compression scheme that is truly cross-platform and has many new features that are useful for multimedia and Web-based radiologic teaching. The widespread acceptance of PNG by the World Wide Web Consortium and by the most popular Web browsers and graphic manipulation software companies suggests an expanding role in the future of multimedia teaching file development.
Index Terms: Data compression • Digital imaging and communications in medicine (DICOM) • Education • Images, digitization • Images, display Images, quality • Images, storage and retrieval • Images, transmission • Internet • Picture archiving and communication system (PACS)
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