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Proceedings Paper

Implementation of a fault-tolerant PACS over a grid architecture
Author(s): Marco A. Gutierrez; Carlos S. Santos; Ramon A. Moreno; Luiz O. M. Kobayashi; Sergio S. Furuie; Sergio M. Freire; Daniel B. Floriano; Carlos S. Oliveira; Mario João; Ronaldo C. Gismondi
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Paper Abstract

The goal of this paper is to describe the experience of the Heart Institute (InCor) on the implementation of a fault-tolerant Picture Archiving and Communication System (PACS) over a data grid architecture. The system is centered on a DICOM image server with a distributed storage and failover capability. The proposed data grid architecture is deployed over a gigabit Ethernet network which integrates the two main public Hospitals in Sao Paulo and one University Hospital in Rio de Janeiro, both in Brazil. Distributed data storage in the three sites is managed by the Storage Resource Broker (SRB) developed at the University of California at San Diego. The architecture of the implemented PACS image server can be divided into two major functional modules: a) DICOM protocol handler; b) Distributed storage of image data. Fault-tolerance is achieved by injecting redundancy into the modules, which are provided with failover capability. The DICOM protocol handler comprises a series of server processes hosted by different machines and a load-balancer node which distributes the computational load among the servers. The load balancer is provided with a backup node which is triggered in case of failure, thus assuring the continuous operation of the system. Distributed storage of image data is implemented as a thin software layer over the SRB. Image data are replicated at the three sites, so the PACS server is able to retrieve image data even when only a single site is available. A prototype of the DICOM image server has been deployed in this environment and is currently under evaluation.

Paper Details

Date Published: 16 March 2006
PDF: 10 pages
Proc. SPIE 6145, Medical Imaging 2006: PACS and Imaging Informatics, 61451F (16 March 2006); doi: 10.1117/12.653312
Show Author Affiliations
Marco A. Gutierrez, Univ. of Sao Paulo Medical School (Brazil)
Univ. of Sao Paulo (Brazil)
Carlos S. Santos, Univ. of Sao Paulo Medical School (Brazil)
Univ. of Sao Paulo (Brazil)
Ramon A. Moreno, Univ. of Sao Paulo Medical School (Brazil)
Luiz O. M. Kobayashi, Univ. of Sao Paulo Medical School (Brazil)
Univ. of Sao Paulo (Brazil)
Sergio S. Furuie, Univ. of Sao Paulo Medical School (Brazil)
Univ. of Sao Paulo (Brazil)
Sergio M. Freire, State Univ. of Rio de Janeiro (Brazil)
Daniel B. Floriano, State Univ. of Rio de Janeiro (Brazil)
Carlos S. Oliveira, State Univ. of Rio de Janeiro (Brazil)
Mario João, State Univ. of Rio de Janeiro (Brazil)
Ronaldo C. Gismondi, State Univ. of Rio de Janeiro (Brazil)


Published in SPIE Proceedings Vol. 6145:
Medical Imaging 2006: PACS and Imaging Informatics
Steven C. Horii; Osman M. Ratib, Editor(s)

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