Image analysis – Applications – Biomedical applications
Patent
1993-11-01
1995-08-29
Mancuso, Joseph
Image analysis
Applications
Biomedical applications
378 4, 36441317, G06K 900, G06F 1500
Patent
active
054467993
ABSTRACT:
An x-ray source (14) is rotated along a non-circular path (18) to irradiate a subject in an examination region (10) with a fan beam (16) of radiation. Radiation detectors convert rays of the fan beam which have traversed the examination region into electronic data which is stored as data fans in an initial data memory (22). Each data fan is zero-filled (24) and convolved by a convolver (30). Preferably, the convolver transforms each data fan into Fourier-space (32), filters each data fan in Fourier-space with a roll-off filter (36), and converts the filtered data fan back from Fourier-space (38). Each fan is weighted (42) by a 1/cos weighting function and stored in a weighted data memory (44). Rays which are redundant in a 180.degree.+ fan reconstruction are removed (46) from the convolved data fans. A pixel driven backprojector (50) backprojects each convolved and redundant ray removed data fan into an image memory (56). The backprojector weights each data value of each ray in proportion to 1/R, where R is a distance from the apex of the backprojected convolved fan to each corresponding pixel of the resultant image. A video processor (60) converts the electronic image representation stored in the image memory (56) into appropriate format for display on a video monitor (62).
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"Convolution Reconstruction Techniques for Divergent Beams", Herman, et al. Comput. Biol. Med. Pergamon Press 1976 vol. 6, pp. 259-271.
Del Rosso Gerard
Mancuso Joseph
Picker International Inc.
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