Region of interest tomography employing a differential...

Details Region of interest tomography employing a differential... Region of interest tomography employing a differential...

G - Physics

06

T

358/11.1

G06T 11/00 (2006.01)

Patent

CA 1274922

Abstract A method of generating a computed tomographic image of a region of interest of a sample is described in which only the region of interest need be scanned, i.e. it is not necessary to scan the entire sample. Reference data for the region of interest of a complete reference object that is a relatively good match to the sample outside the region of interest and has a known atten- uation distribution inside the region of interest is first obtained. This can be done by scanning only the region of interest of an actual complete reference object or by constructing a digital image of the reference object and mathematically scan- ning only the region of interest of the image. Then the region of interest of the sample is scanned to obtain sample data from which the reference data is subtracted. A differential image is recon- structed from the differential data thus obtained. The method allows the use of equipment which is simpler, more compact and less costly than conventional CT equipment.

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