Abstract: A rectilinear scanner for detecting radiation in a plurality of channels utilizing a collimator. Each of the channels receives information from a different portion of the collimator. Information separately received is separately massaged and later collated to present a common image. The information is processed by apparatus in a data processing system. This system has means for massaging analog signals corresponding to gamma radiation counts. This system has means for converting such analog signals to digital signals. This system has means interfacing the digital signals into an address register that communicates directly via data busses to core memory of a central processing unit by cycle stealing. This system has means deriving clinically significant information by computation on the resultant digital data. This system has means storing, retrieving, and displaying the resultant digital data and the resultant derivations therefrom collectively.