X-ray computerized tomography apparatus for obtaining consecutiv

Details X-ray computerized tomography apparatus for obtaining consecutiv X-ray computerized tomography apparatus for obtaining consecutiv

1992-03-18

1994-05-24

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

36441318, 36441321, 378901, G06F 1542

Patent

active

053156650

ABSTRACT:
In a helical scanning X-ray CT apparatus, views at an m-th slice position are obtained by interpolating 360.degree. views in a range next to the slice position in a forward direction in which the slice position number increases and 360.degree. views in a range next to the slice position in the backward direction, and m-th tomographic image is reconstructed based on the interpolated views at the m-th slice position. An m-th backward image (mBI) is reconstructed based on the 360.degree. views in the range next to the m-th slice position in the backward direction without interpolation and an m-th forward image (mFI) is reconstructed based on the 360.degree. views in the range next to the m-th slice position in the forward direction without interpolation. An (m+1)BI is obtained by BP [CONV (a-b)] on the mBI and (m+1)FI is obtained by BP [CONV (c-a)] on the mFI. Here, BP: back projection, CONV: convolution, a: a view at the m-th slice position, b: a view which is separated from "a" by 360.degree., and c: a view which is separated from "a" by 360.degree.. An (m+1)th image is obtained as follows:

REFERENCES:
patent: 4293912 (1981-10-01), Walters
patent: 4495645 (1985-01-01), Ohhashi
patent: 5073911 (1991-12-01), Ozaki et al.
patent: 5212717 (1993-05-01), Hada
patent: 5216601 (1993-06-01), Crawford

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