Boots – shoes – and leggings
Patent
1990-06-18
1993-07-20
Kemeny, Emanuel S.
Boots, shoes, and leggings
378901, 36441314, A61B 602
Patent
active
052299341
ABSTRACT:
A CT or other radiographic scanner (A) generates data that is arranged into sets (32). Each set is convolved (40) with a convolution function (42) and backprojected (44) into an image memory (46) along a corresponding one of a plurality of rays. A corresponding gradient image (52) in which each pixel value has either a one or a zero value is forward projected (54) and compared (60) with a standard. The comparison indicates along which rays data sets including bad data were projected. To subtract the bad data contribution from the image, the image representation is forward projected (90) along the identified rays, convolved (40) with a negative of the convolution function (84), and backprojected (44) along the identified ray into the image memory (46). Further correction may be obtained by replacing the subtracted data with interpolated data. To this end, the image representation is again forward projected (90) along the identified ray, convolved (40) with the original selected convolution function (42), and backprojected (44) into the image representation (46) along the identified ray.
REFERENCES:
patent: 4272820 (1981-06-01), Lux
patent: 4712178 (1987-12-01), Tuy
patent: 4769757 (1988-09-01), Horiba et al.
Mattson Rodney A.
Tuy Heang K.
Kemeny Emanuel S.
Picker International Inc.
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