G - Physics – 01 – N
Patent
G - Physics
01
N
358/11.1
G01N 23/00 (2006.01) G06T 11/00 (2006.01)
Patent
CA 1213082
37 ABSTRACT: "Method of and device for determining the distribution of radiatiof attenuation in a body section". Using the method and device for computer tomo- graphy in accordance with the invention, always the same filtering operation can be performed for image re- construction, regardless of the method used to measure the measurement data: parallel (whether equidistant or not) or divergent (whether equiangular or not), provided that before and after the filtering of the measurement data there is performed a multiplication by a pre-con- ditioning factor and a post-conditioning factor, respec- tively. The pre-conditioning and post-conditioning fac- tors are dependent on the type of reconstruction and on the position of a measurement data value in the group of measurement data filtered or to be filtered. The fact that the same filter can be used is important notably for computer tomography apparatus in which the (convo- lution) filter is embodied in an electronic circuit (by means of hardware). The back projection device of a de- vice in accordance with the invention is suitable for the back-projection of measurement data along either di- vergent measurement paths or parallel measurement paths for which it requires only the modification of a few constants applied to the back-projection device.
439261
Deckers Willem H.m.
Op de Beek Johannes C.a.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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