X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2007-05-08
2007-05-08
Ullah, Akm E. (Department: 2809)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C382S131000, C378S901000
Reexamination Certificate
active
11164625
ABSTRACT:
A reprojection/backprojection technique and apparatus for carrying out such a technique provides a hierarchical solution to speeding-up reprojection and backprojection of tomographic images. In the context of reprojection, a tomographic image is divided into a series of subimages. Each subimage is shifted to the origin, projected at a reduced number of views, and then up-sampled and shifted back (in the sinogram space). The resulting sinograms are then combined to provide a single sinogram. This process is applied one or more times recursively. In the context of backprojection, the above steps are transposed such that a sinogram is divided into a series of subsinograms. The subsinograms are then shifted and decimated by a given decimation factor. The decimated subsinograms are then backprojected onto hexagonal tiles whereupon the tiles are composited into a final image.
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Basu Samit Kumar
DeMan Bruno Kristiaan Bernard
Brueske Curtis B.
Cohran Anthony K.
General Electric Company
Powell, III William E.
Ullah Akm E.
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