Device for measuring radiation absorption

Details Device for measuring radiation absorption Device for measuring radiation absorption

G - Physics

01

T

358/11

G01T 1/16 (2006.01) G01T 1/161 (2006.01)

Patent

CA 1069222

ABSTRACT: In X-ray scanners operating with a large number of detectors ("fan scan") the problem exists that reconstruction errors occur in and about the centre of rotation, which errors 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 od detectors than is neces- sary for the measurement of the scanning field and that the de- tector arc pivots about its centre of curvature during the measurement. As a result of this the absorption in the centre of rotation is measured by different detectors of which the different sensitivities, with a sufficiently large number of extra detectors, can be averaged to a considerabl extent.

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