Back to results
US 5,491,735 AGranted
Image reconstruction apparatus and method for helical scanning
AssigneeGeneral Electric Company
InventorJiang Hsieh
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeGeneral Electric Company
InventorJiang Hsieh
Estimating the term…
The present invention, in one form, utilizes a region of reconstruction ROR in reconstructing an image from projection data. Particularly, once the region of reconstruction is established, a weighting function which is either a linear interpolation or a non-interpolation can be used. If 3.pi. of projection data is used, the weighting function can be divided into three parts. Each part corresponds to .pi. projection views. For a 50% overlapped reconstruction, the entire weighting functions advance .pi. degrees at a time, which synchronizes very well with the boundaries of the weighting functions. Section 1(S.sub.1) will contain projection views from 0 to .pi., section 2 (S.sub.2) contains views from .pi. to 2.pi., and section 3 (S.sub.3) contains views from 2.pi. to 3.pi.. In section S.sub.1, the weighting function is a ramp-up function, in section S.sub.2 the weighting function is a constant, and in section S.sub.3 the weighting function is ramped down.
A method of producing a tomographic image of an image object from data acquired in a helical scan, the data having been collected in a series of fan beam projections at a plurality of gantry angles about an axis and within an image plane, said method comprising the steps of:
A system for of producing a tomographic image of an object, said system comprising means for perforating a helical scan of the object and for collecting beam projection data during the helical scan from a series of fan beam projections at a plurality of gantry angles about an axis and within an image plane, said tomographic image system further comprising a data acquisition system configured to:
A data acquisition system for use in connection with a tomographic imaging system which performs a helical scan of an object and collects beam projection data during the helical scan from a series of fan beam projections at a plurality of gantry angles about an axis and within an image plane, said data acquisition system comprising:
Dependencies are inferred from the claim text.