Method and computer tomography device for determining a...

Details Method and computer tomography device for determining a... Method and computer tomography device for determining a...

H - Electricity

05

G

354/21, 358/11.1

H05G 1/00 (2006.01) A61B 6/00 (2006.01) G06T 11/00 (2006.01)

Patent

CA 1205214

18 ABSTRACT: Method and computer tomography device for determining a tomographic image with elevated resolution. The invention relates to a computer tomography device, in which the row of detectors has been rotated through the quarter of a detector angle (.DELTA.?/4) with respect to the X-ray source. The invention proposes to filter (or convolute) the selected parallel measurement values measured in a given direction instead of doing so with all the se- lected measurement values measured in parallel and anti- parallel directions. Although a loss then occurs for the information in the range of higher frequencies, this loss is not significant. Due to the frequency-limiting influences of the width of the measuring beam, interpolation in the backprojection device and image element size in the image matrix, the overall frequency response curve of the computer tomography device is not essentially worse. With the use of the present invention, however, the calculating time required for filtering is reduced by a factor 2 and the current measurement values can be processed in a simpler manner (pipeline processing).

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