Telemedicine is being used by physicians at the member hospitals of the Jefferson Cancer Network (JCN) for consultations regarding the diagnosis and management of cancer patients. The technology employed for this telemedicine system was chosen to meet three related specifications: low capital and operating cost, internal maintainability by community hospital data processing staffs, and compatibility with the existing technologic infrastructure. The solution selected is the ubiquitous desktop personal computer and associated software, and Integrated Services Digital Network (ISDN) communications links. The overall performance of this technology has been very satisfactory; ISDN communications has sufficient bandwidth for the transfer of patient data, including text reports, radiographs, and pathology slide images. The presence of the radiologist's interpretation along with the radiographic images allows the presentation of the images on these systems to be acceptable for review purposes. The video frame rates of these systems (12 to 15 frames per second) is adequate, particularly given the "talking heads" nature of the video presentations. Furthermore, the quality of the video image (resolution, size, frame rate) is secondary to the quality of the presentation of the medical information displayed and the capability for mutual annotation of the patient data during the consultation.

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The Medical Computer Facility at the Fox Chase Cancer Center has installed X-terminals in patient examination rooms and at nursing stations for clinical data access by physicians and nurses. The X-terminals are connected to UNIX operating system RISC processors via Ethernet. The RISC processors communicate with databases on a minicomputer cluster. Simultaneous presentation of textual (e.g., pathology and radiology reports) and graphical (e.g., clinical laboratory results) clinical data is provided under X-Windows. CT and MRI images can also be displayed in windows. Our experiences implementing X-terminal clinical workstations in a production environment will be discussed.

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