Emi, LLC

John L Ryan

Ian A Fairbairn

A Local Area Network consists of a number of stations connected together by a transmission line, each station having a transmitter and a receiver. A transmitter generates a sequence of information signals having individual message portions separated from one another by flag signals, each message portion having a predetermined number of symbols. A receiver processes a message portion by analyzing the content of each section formed by dividing the message portion into the predetermined number of equal parts. The receiver includes stores and, a detector, a signal-divider and a unit which determines a representative value.

Asynchronous communications network

In CT scanners signals representing attenuation of radiation along beam paths through the patient may be processed by a convolution technique to give radiation absorption values for a matrix of elements in a region of interest. It the beams are distributed in a fan-shape from a focus the convolution can be applied but the signals need to be weighted by a factor related to the distance of a respective matrix element from the focus. By consideration of the geometry of a CT scanner of this kind it has been found that the weighting may be achieved more efficiently if the signals for all beams are preweighted by a factor related to the angular position of the beam in the fan, leaving only a simple scaling factor which needs to be applied for each martrix element.

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Chalfont St. Peter, United Kingdom

John L Ryan