X-ray CT apparatus and image reconstruction method

Details X-ray CT apparatus and image reconstruction method X-ray CT apparatus and image reconstruction method

2011-05-24

2011-05-24

Glick, Edward J (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S004000

Reexamination Certificate

active

07949090

ABSTRACT:
An X-ray CT apparatus is provided for reducing the amount of computation at image reconstruction thereby to shorten an image reconstruction time. The X-ray CT apparatus comprises a cradle which moves in a horizontal direction to convey a subject to a photography space, an X-ray detector comprising a plurality of detecting element rows, for obtaining projection data by a helical scan when the cradle is moved under acceleration/deceleration and at a constant velocity, and backprojection processing device for performing a backprojection process on the projection data. When image reconstruction is carried out using the projection data acquired when the cradle is moved under acceleration/deceleration, the backprojection processing device assumes a virtual image reconstruction plane P′ where the cradle is assumed to be moved at the constant velocity, with respect to an image reconstruction plane P of each view and backprojects projection data onto the virtual image reconstruction plane P′.

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