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An Interface between Several Cameras and Two Computers, Using Differential Analog Transmission

St Joseph’s Hospital, University of Western Ontario, and Victoria Hospital Corporation, London, Ontario, Canada

Correspondence: For reprints contact: T. D. Cradduck, PhD, Dept. of Nuclear Medicine, Victoria Hospital Corp., 375 South St., London, Ontario, Canada N6A 4G5.

ABSTRACT

A system has been built to allow up to four scintillation cameras to be connected in parallel with two computers, yet provide for selection of individual pairs of camera/computer combinations with the exclusion of unwanted connections. Since the distances involved were relatively long, signal drivers were used to transmit the analog signals in a differential mode over multiple twin-paired lines rather than coaxial cable. By transmitting the signals differentially, any noise induced on the signal was subtracted at the receiver. The principal features of this system, which has been installed in two institutions, are described. A problem that occurred in connection with one camera is presented (also its solution), with a suggestion concerning parameters to be assessed at the time of system acceptance.