X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1998-10-29
2000-08-15
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 15, 378901, A61B 603
Patent
active
061047759
ABSTRACT:
A method of image reconstruction from wedge beam data includes collecting cone beam data in two-dimensional arrays. The collected data corresponds to rays of penetrating radiation diverging in two dimensions from a common vertex which travels along a curve. Each element of the data is related to line integrals of an object being reconstructed taken along each ray. A local coordinate system is defined having three mutually orthogonal axes and an origin at the vertex. The third axis of the local coordinate system extends in a direction tangential to the curve at the vertex. The collected data is rebinned into a wedge beam format wherein sets of parallel rays are grouped to define planes of radiation that angularly diverge from a common axis. A one-dimensional convolution of the rebinned data is computed in the local coordinate system along a direction parallel to the third axis. Finally, the convolved data is weighted and three-dimensionally backprojected. In a preferred embodiment, the curve defines a helical path, and the kernel for the one-dimensional convolution of the rebinned data is a ramp convolver.
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Bruce David V.
Picker International Inc.
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