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T-Space at The University of Toronto Libraries >
Journal of Medical Internet Research >
Volume 3 (2001) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/4616

Title: Virtual Sonography Through the Internet: Volume Compression Issues
Authors: Ferrer-Roca, Olga
Vilarchao-Cavia, Joseba
Troyano-Luque, Juan-Mario
Clavijo, Matilde
Keywords: Original Paper
Virtual sonography, telemedicine, 3D-ultrasound, 3-D ultrasound, obstetrics, volume rendering
Issue Date: 22-Jun-2001
Publisher: Gunther Eysenbach; Centre for Global eHealth Innovation, Toronto, Canada
Citation: Olga Ferrer-Roca, Joseba Vilarchao-Cavia, Juan-Mario Troyano-Luque, Matilde Clavijo. Virtual Sonography Through the Internet: Volume Compression Issues. J Med Internet Res 2001;3(2):e21 <URL: http://www.jmir.org/2001/2/e21/>
Abstract: [This item is a preserved copy and is not necessarily the most recent version. To view the current item, visit http://www.jmir.org/2001/2/e21/ ] Background: Three-dimensional ultrasound images allow virtual sonography even at a distance. However, the size of final 3-D files limits their transmission through slow networks such as the Internet. Objective: To analyze compression techniques that transform ultrasound images into small 3-D volumes that can be transmitted through the Internet without loss of relevant medical information. Methods: Samples were selected from ultrasound examinations performed during, 1999-2000, in the Obstetrics and Gynecology Department at the University Hospital in La Laguna, Canary Islands, Spain. The conventional ultrasound video output was recorded at 25 fps (frames per second) on a PC, producing 100- to 120-MB files (for from 500 to 550 frames). Processing to obtain 3-D images progressively reduced file size. Results: The original frames passed through different compression stages: selecting the region of interest, rendering techniques, and compression for storage. Final 3-D volumes reached 1:25 compression rates (1.5- to 2-MB files). Those volumes need 7 to 8 minutes to be transmitted through the Internet at a mean data throughput of 6.6 Kbytes per second. At the receiving site, virtual sonography is possible using orthogonal projections or oblique cuts. Conclusions: Modern volume-rendering techniques allowed distant virtual sonography through the Internet. This is the result of their efficient data compression that maintains its attractiveness as a main criterion for distant diagnosis.
Description: Reviewer: Keevil, Stephen
Reviewer: Mea, Vincenzo Della
Reviewer: Mogel, Greg
URI: http://hdl.handle.net/1807/4616
ISSN: 1438-8871
Other Identifiers: doi:10.2196/jmir.3.2.e21
Rights: Copyright (cc) Retained by author(s) under a Creative Commons License: http://creativecommons.org/licenses/by/2.0/
Appears in Collections:Volume 3 (2001)

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