Cone-beam reconstruction apparatus and computed tomography...

Details Cone-beam reconstruction apparatus and computed tomography... Cone-beam reconstruction apparatus and computed tomography...

2005-07-12

2005-07-12

Bruce, David V (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S015000, C378S901000

Reexamination Certificate

active

06917663

ABSTRACT:
A method for obtaining data from CT scans, including obtaining projection data from at least one detector row in a CT system; applying a weighting function including cone-angle dependent weight to projection data; filtering weighted data; and backprojecting weighted data while accounting for cone-angle. The method finds application to an X-ray CT apparatus, including a helical scanning device configured to collect projection data while at least one of a gantry and a couch moves along an axial direction, the helical scanning device including an X-ray source to generate X-rays, and a detector having detector elements arranged in rows along the axial direction to produce projection data; and a processor, which includes a weighting device to apply a weighting function including cone-angle dependent weight to projection data, thereby obtaining weighted data, a filtering device to filter weighted data, and a backprojecting device to backproject weighted data while accounting for cone-angle.

REFERENCES:
patent: 5708691 (1998-01-01), Zmora
patent: 5825842 (1998-10-01), Taguchi
patent: 6324241 (2001-11-01), Besson
patent: 6341154 (2002-01-01), Besson
G.E. Medical Systems, “LightSpeed Image Reconstruction,” (Jul. 2002).
Jiang Hsieh, Brian Grekowicz, Piero Simoni, et al., “Convolution Reconstruction Algorithm for Multi-slice Helical CT,” SPIE vol. 5032 (2003), Medical Imaging 2003, pp. 716-723.

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