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

1998-01-13

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, A61B 603

Patent

active

057086915

ABSTRACT:
A computed tomography method and system where a voxel of a subject irradiated with x-rays is divided into an plurality of sub-voxels, and backprojection data is obtained for the sub-voxels. Projection data for the sub-voxels can be weighted before backprojecting, or the projection data can be backprojected and then weighted. With the method according to the invention, instead of backprojecting data on a straight line passing through the center of a voxel, the beam passing through the entire voxel is backprojected. Also, the method and system weights the sub-voxels using a space-variant function. The weighting can be applied to discrete sub-voxels or integration can be used with infinitely thin sub-voxels. The present invention is a more accurate method and can take into account of spreading of the x-ray beam.

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patent: 5430783 (1995-07-01), Hu et al.
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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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