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Proceedings Paper

Implementation of system intelligence in a three-tier telemedicine/PACS hierarchical storage management system
Author(s): Woodrew Chao; Bruce Kuo Ting Ho; John T. Chao; Reza M. Sadri; Lu J. Huang; Ricky K. Taira
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Paper Abstract

Our tele-medicine/PACS archive system is based on a three-tier distributed hierarchical architecture, including magnetic disk farms, optical jukebox, and tape jukebox sub-systems. The hierarchical storage management (HSM) architecture, built around a low cost high performance platform [personal computers (PC) and Microsoft Windows NT], presents a very scaleable and distributed solution ideal for meeting the needs of client/server environments such as tele-medicine, tele-radiology, and PACS. These image based systems typically require storage capacities mirroring those of film based technology (multi-terabyte with 10+ years storage) and patient data retrieval times at near on-line performance as demanded by radiologists. With the scaleable architecture, storage requirements can be easily configured to meet the needs of the small clinic (multi-gigabyte) to those of a major hospital (multi-terabyte). The patient data retrieval performance requirement was achieved by employing system intelligence to manage migration and caching of archived data. Relevant information from HIS/RIS triggers prefetching of data whenever possible based on simple rules. System intelligence embedded in the migration manger allows the clustering of patient data onto a single tape during data migration from optical to tape medium. Clustering of patient data on the same tape eliminates multiple tape loading and associated seek time during patient data retrieval. Optimal tape performance can then be achieved by utilizing the tape drives high performance data streaming capabilities thereby reducing typical data retrieval delays associated with streaming tape devices.

Paper Details

Date Published: 12 May 1995
PDF: 7 pages
Proc. SPIE 2435, Medical Imaging 1995: PACS Design and Evaluation: Engineering and Clinical Issues, (12 May 1995); doi: 10.1117/12.208805
Show Author Affiliations
Woodrew Chao, UCLA School of Medicine (United States)
Bruce Kuo Ting Ho, UCLA School of Medicine (United States)
John T. Chao, UCLA School of Medicine (United States)
Reza M. Sadri, UCLA School of Medicine (United States)
Lu J. Huang, UCLA School of Medicine (United States)
Ricky K. Taira, UCLA School of Medicine (United States)


Published in SPIE Proceedings Vol. 2435:
Medical Imaging 1995: PACS Design and Evaluation: Engineering and Clinical Issues
R. Gilbert Jost M.D.; Samuel J. Dwyer III, Editor(s)

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