Abstract: A dial-up teleconferencing network was implemented between three radiologic educational sites for a 30-day period of evaluation. By means of standard T-1 telephone channels, compressed video and audio signals displayed radiologic images, slides and text, allowing residents and faculty from the three sites to participate in visual and auditory interactions. Each site used compressed video/audio codecs conforming to the Comite Consultatif International de Telegraphique et Telephonique (CCITT) H.261 standard. Four video cameras were used at each site and the audio was run in full duplex mode. A multipoint video bridge was used to telecast codec output signals to the input lines of the other codecs. Although audio quality and spatial resolution need to be improved, the results of this pilot study imply that compressed video conferencing has the potential to become a practical, cost-effective method of sharing educational resources by means of interactive radiologic multisite educational programs. !6
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