U.S. Philips Corporation

Klaus Pasedach

Wolfgang Wagner

Hermann Weiss

Gunter Kowalski

Dietrich Meyer-Ebrecht

Gunther Groh

In fan beam X-ray scanners operating with a large number of detectors, errors at and near the center of rotation are caused by the fact that the radiation absorption in said area is substantially always measured by the same detectors and that the sensitivity of all detectors is not exactly the same. The invention provides an improvement in that the measurement is carried out with a larger number of detectors than is necessary for the measurement of the scanning field and that the detectors pivot during the measurement. As a result, the absorption in the center of rotation is measured by different detectors so that, for a sufficient number of detectors the different sensitivities, errors are averaged and thus reduced or cancelled.

Fan beam CT scanner with compensating detector motion

Method of and device for coding and decoding an image of an object by

A device for examining a body section by means of x-radiation including a plurality of detectors arranged to intercept radiation passing through the body in straight lines or strips and a calculating circuit which interpolates, on the basis of absorption values measured, absorption values which can be expected along sets of mutually extending strips which cross each other at different angles. The absorption in the section of the body can then be calculated in known manner on the basis of these values.

Device for measuring radiation absorption in a section of a body

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Hamburg, Germany

Klaus Pasedach