CT cone beam image reconstruction with circle and line scan path

Details CT cone beam image reconstruction with circle and line scan path CT cone beam image reconstruction with circle and line scan path

1996-06-25

1998-07-21

Couso, Jose L.

Image analysis

Applications

Biomedical applications

378 4, 378901, G06K 900

Patent

active

057844810

ABSTRACT:
A CT cone beam imaging system is provided wherein a source of cone beam radiation and a detector array are mounted for movement with respect to an object, to provide a reconstructed image of the object. Relative movement is established between the cone beam source and the object along a scan path comprising a circular component and a linear component. The source is operated to irradiate the object during such movement to project cone beam data onto the detector, the projected data comprising linear and circular data sets which respectively correspond to the linear and circular components of the scan path. To significantly minimize processing requirements, a subset of data elements is selected from the linear data set, wherein each of the selected data elements is associated with a set of spatial parameters which define spatial regions contained within a hypothetical sphere in the Radon space, but which are not intersected by a Radon shell defined by dimensions of the circular path and the cone beam. First and second sets of image reconstruction data are respectively generated from the subset of the linear data and the circular data, the first and second sets being combined to provide an image of the object.

REFERENCES:
patent: 5170439 (1992-12-01), Zeng et al.
patent: 5400255 (1995-03-01), Hu
patent: 5404293 (1995-04-01), Weng et al.
"Practical cone-beam algorithm" Feldkamp et al. J. Opt.Soc. Am. A/vol. 1, No. 6/Jun. 1984; pp. 612-619.
"A New Cone Beam Reconstruction Algorithm for the Circular Orbit," H.Hu,IEEE MIC 1994;pp. 1261-1265.

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