X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1996-03-26
1997-10-28
Wong, Don
X-ray or gamma ray systems or devices
Beam control
Scanner
378901, G21K 5110
Patent
active
056824149
ABSTRACT:
An X-ray computerized tomography apparatus includes n number of X-ray detector arrays. Each of X-ray signals detected by the detector arrays during helical scan is stored associated with an angle of a rotating gantry and the position of a top board. Also, each of the X-ray signals is stored associated with an angle differing by 180 degrees and the corresponding position of the top board. A pair of first and second X-ray signals for the same angle of the gantry is selected for each of predetermined angles ranging from 0.degree. to 360.degree.. The first X-ray signal corresponding to the first position closest to the position of a plane section of a subject under examination and the second X-ray signal corresponding to the second position that is closest to the position of the plane section on the opposite side of the first position for the first X-ray signal with respect to the position of the plane section are subjected to weighted-averaging according to their distance from the position of the plane section. A tomogram of the plane section is reconstructed from the results of the weighted-averaging.
REFERENCES:
patent: 5212717 (1993-05-01), Hada
patent: 5430783 (1995-07-01), Hu et al.
patent: 5454010 (1995-09-01), Migita et al.
Kabushiki Kaisha Toshiba
Wong Don
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