X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1994-12-22
1996-02-13
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, 36441317, A61B 603, G01N 23083
Patent
active
054917352
ABSTRACT:
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.
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Beulick John S.
Bruce David Vernon
General Electric Company
Pilarski John H.
Porta David P.
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