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    초록·키워드

    This paper describes the design, implementation, and performance evaluation of a distributed PACS(Picture Archiving and Communication System). The database archive system in a PACS stores the patient's image and information in a mass storage. The real time operation is required for retrieving images and sending them to the viewing workstations. To provide real time image retrieval, a distribution of an image database and distributed processing are considered in this paper. The system design and implementations are approached in a small scale instead of a large scale at this stage. But, the design can be enlarged easily to implement large scale PACS for efficient medical services. The feature of the designed PACS provides not only distributed database server, but also distributed data at each terminal workstation. The data integrity must be guaranteed, when the database is distributed and the same data is duplicated in different locations. Thus, a transaction management scheme is designed to update duplicated data whenever original data is modified. The performance of this distributed system is studied using Modeling. Construction of the models is done using UltraSAN, a graphical oriented software tool for model specification, analysis and simulation. The results of this simulation shows that the load of server system and total network traffic was decreased by distributing data between Main Database and Local Database with data integrity.

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      UCI(KEPA) : I410-ECN-0101-2009-569-013214329