Projected digital radiologic images for teaching: balance of image quality with data size constraints

Academic Radiology
Dawid SchellingerhoutR Gilberto Gonzalez

Abstract

The authors performed this study to determine, in the context of a teaching presentation with slides, the information content needed in a digitized radiologic image for it to be equivalent in quality to an analog image. Eleven sets of radiologic images were obtained from a teaching file collection and digitized. The images were scanned at high resolution and saved as image files. The information content of each image was then halved repeatedly with repeat sampling of the image. This procedure was repeated nine times to yield a total of 10 images with an information content that ranged from very low (32 kB) to high (12 MB). Each of these image files was made into a 35-mm slide by using a digital slide maker. The original radiographs were subsequently made into slides by using conventional photographic methods. Care was taken to make the images identical in every respect except digitization and information content. The slides were shown to radiologists, who filled out questionnaires to rate image quality. Digitized slides that contain an average of 416 kB of data (the equivalent of a 750 x 570-pixel matrix with 8-bit gray levels) were equivalent to analog images for 90% of viewers. At 830 kB (1,060 x 800-pixel matrix with 8-bit g...Continue Reading

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Citations

Jun 1, 2005·Journal of Digital Imaging·Wen-Jeng LeeShyh-Jye Chen
Mar 25, 2005·AJR. American Journal of Roentgenology·Mark S Frank, Richard B Gunderman
Sep 5, 2006·American Journal of Veterinary Research·Stephanie Essman, Ashley Sherman
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Jul 26, 2014·Microscopy Research and Technique·Kiran FatimaHammad Majeed
Jul 21, 2005·The American Journal of Emergency Medicine·Michael BlaivasSandeep Duggal
Apr 21, 2017·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Mira ValkonenPekka Ruusuvuori
May 5, 2017·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Diego A Sierra FPhilipp Wiedemann
Apr 13, 2018·Medical Physics·Daniel LétourneauDavid A Jaffray
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