title: Efficient memory management strategy in hypermedia with interactive MR images.
abstract: When composing hypermedia with interactive image sets the main problem is to allocate minimal memory of random access memory (RAM). The stand-alone product should be accessible to the public and not require too much memory to maintain interaction between the images and the text. We designed a new hypermedia application using SuperCard and image stacks in PICS format running on a Macintosh LC computer. Memory use was effective since the images were kept in external files outside the application. On browsing cards the images were requested from the image file and each image was displayed within about 1 second as a floating frame on top of the card in the top window. Interactivity when presenting, for example, anatomical parts was achieved by bitmap objects which were activated through the image by pointing at them through the image. By pointing at a text object the corresponding anatomical bitmap object was visualised through the image. The stand-alone version of the application with up to 100 cards runs on a 2 Mb RAM set-up. The maximum sizes of the external image stacks are not dependent on the RAM size.
authors.affiliation: Department of Radiology, Meilahti Hospital, Helsinki University Central Hospital, Finland.
authors.forename: S
authors.initials: S
authors.lastname: Bondestam
authors.forename: A E
authors.initials: AE
authors.lastname: Lamminen
authors.forename: H J
authors.initials: HJ
authors.lastname: Aronen
mesh_terms: D008279:Magnetic Resonance Imaging; D012984:Software