In this paper, Georgetown University Medical Center's (GUMC) experience with utilizing ATM (Asynchronous Transfer Mode) technology in a telemedicme application will be presented. This application involves 3-D radiation treatment planning where radiological imaging, calculation of the treatment plan, and 3-D display all take place at different sites. To do this, GUMC must exchange large amounts of radiology images and data with other institutions in real time. A high speed network consisting of an ATM infrastructure and satellite links was created to connect seamlessly the three sites, GUMC, University of Hawaii(UH), and Ohio Supercomputing Center(OSC), which are thousands of miles apart. This paper studies the performance of the ATM network between GUMC and Goddani Space Flight Center (GSFC), which provides sateffite service to link partners in this project.The steps required to test and evaluate the ATM system will be presented. A performance comparison between ATM and Internet-LAN connections will be featured in the presentation. In particular, the theoretical speed of 155 Mbps is hard to reach due to the lack of ATM-native protocols in the transport level of the communication structure.
Network performance analysis is an important part of PACS implementation. An understanding of the operational PACS -is necessary for the development of a realistic computer model of the system. Subsequent simulations of the model will help locate under and over utilized nodes and predict the effect of changes to the network. At Georgetown, we have started a model of our AT &T PACS, by first studying the acquisition aspect of the PACS in detail and developing a computer model using PAW simulation software.
The interface of radiology information systems (RIS) to image management and communications systems (IMACS), also known as picture archiving and communication systems (PACS), is necessary if they are to become clinically accepted. At Georgetown, we have started development of an interface between our MIIS based RIS and our AT &T CommView system. This interface is based on a one -way flow of information, with data transferring from the RIS to the PACS only. The interface is invisible to the user and requires no special action by the user to facilitate data transfer.
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