Thomson-cgr

Thomson-csf

Claude D Benchimol

Siv C Tan

Tri Hue Nguyen

Jean Lienard

Didier Le Galle

Method and device for compression by the conditional encoding of digital

In a tomodensitometric image reconstruction process the detectors 11 of the tomodensitometer are offset by .DELTA.d/4 (.DELTA.d being the pitch of the detectors), and reconstruction is performed during one complete revolution of the detector assembly, the linear absorption values being weighed by a coefficient .alpha. and an equivalent number of intermediary values being produced by summing each time two successive juxtaposed real values (summation device 20) and weighing the resulting sum by a coefficient .beta./2 prior reconstructing the image on the basis of all these data.

Process of image reconstruction by tomodensitometry with improved

A method for reconstructing a high resolution image by interpolating intermediate values obtained from data collected over a complete revolution of the tomodensitometer. A shift of ##EQU1## is provided between the middle of the multi detector and the straight line joining the focal point of the X rays and the center of rotation and the views V.sub.i collected over a complete revolution are completed from 'views' V'.sub.i resulting from a transformation:

Method of reconstructing a high resolution image by tomodensitometry

An image acquisition and reconstruction process for increasing the definition of the radiological image obtained by tomodensitometry. The invention consists in taking two series of data or 'views' and in arranging this data by causing the views W.sub.i of the second series to undergo a translation of --.pi..theta. and a symmetry --.gamma., in the space [.theta.,.gamma.], .theta. being equal to .beta.+.gamma.; .gamma. designates the angle between the different detectors and the straightline joining the origin of the fan-shaped X ray beam to the center of rotation of the source-detectors assembly and .beta. represents the different angles of the source-detectors assembly at which acquisition of the views is made.

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Paris, France

Claude D Benchimol