Image analysis – Applications – Biomedical applications
Patent
1994-12-20
1998-05-26
Boudreau, Leo
Image analysis
Applications
Biomedical applications
382132, 378 4, 378901, G06K 900, A61B 603, G01N 23083
Patent
active
057579512
ABSTRACT:
An x-ray tube of CT or other radiographic scanner has a focal spot (30) from which x-rays with an energy distribution (32) are generated. As the x-ray source rotates a peak (34), the radiation energy distribution seen by each detector (24) through a physical collimator shifts. Each line of data generated by the detectors has a shifting energy distribution across its data values which creates artifacts in reconstructed images. A filter (50) includes a convolver (52) which convolves the lines of data with deconvolution functions from a memory (54) in a recursive loop (56) in accordance with a relative angular position of the x-ray tube and the corresponding detector. Filtered data lines are subtracted (56) from unconvolved data values to generate values with reduced off-focal radiation components. Filtered data is conveyed to a convolver (82) and a backprojector (84) which backprojects the data across an image memory (86).
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Boudreau Leo
Mehta Bhavesh
Picker International Inc.
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