X-ray computed tomographic imaging device and x-ray computed tom

Details X-ray computed tomographic imaging device and x-ray computed tom X-ray computed tomographic imaging device and x-ray computed tom

1996-07-05

1998-10-20

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, A61B 603

Patent

active

058258426

ABSTRACT:
An x-ray computed tomography system and method having a reconstruction processing circuit that interpolates projection data for an x-ray beam path from 2N detector elements in a detector array proximate to a point where the x-ray beam path intersects the detector array. The system and method can also extrapolate data from 2N detector elements when the x-ray path intersects the detector array in an uppermost or lowermost detector row. The system and method determines an overlap region between two x-ray beams and can perform backprojection in the overlap region based upon both of the overlapping beams. The system can also determine a border region in the overlap region and perform backprojection in the border region based upon the two overlapping beams and in the remainder of the overlap area based upon cone angles of the x-ray beams. The system can also cancel or attenuate image artifacts by varying the helical scanning pitch, and can apply position-dependent and/or angular-dependent weighting.

REFERENCES:
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patent: 5377250 (1994-12-01), Hu
patent: 5430783 (1995-07-01), Hu et al.
patent: 5541971 (1996-07-01), Saito
patent: 5583903 (1996-12-01), Saito et al.
Journal of the Japanese Institute of Electronic Information Communication, DII vol. J 74-D-II, No. 8, pp. 1108-1114, Aug. 1991, Hiroyuki Kudo, et al., "Three-Dimensional Helical-Scan Computed Tomography Using Cone-Beam Projections".

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