H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/11.1
H05G 1/00 (2006.01) A61B 6/03 (2006.01)
Patent
CA 1150858
PHN 9535 -15- ABSTRACT: For the backprojection of the convoluted measurement signals in a cartesian coordinate system in a computer tomography device, it is necessary to recalculate the weighting factors for each posi- tion of the source in order to determine the contribution of a convoluted measurement signal to the attenuation value associated with a given element of the output image matrix. The invention relates to the use of a matrix of the memory the origin central coordinate of said matrix coinciding with the centre of rotation of the X-ray source about the object section. The weighting factors are also stored in a polar organised memory. The angular component of the address of the weighting factors is incremented with a rotational increment in the corresponding position of the X-ray source, so that for each group of measurement values, the same weighting factors can be used. The invention enables all the weight- ing factors to be stored in a memory of limited capacity. This is a time consuming and hence expensive form of reconstruction.
355356
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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