Method of reconstructing CT image data

Details Method of reconstructing CT image data Method of reconstructing CT image data

2011-08-23

2011-08-23

Tabatabai, Abolfazl (Department: 2624)

Image analysis

Applications

Biomedical applications

C378S004000, C600S425000

Reexamination Certificate

active

08005287

ABSTRACT:
A method is disclosed for reconstructing CT image data. In at least one embodiment, the method includes providing measured CT projection data p based on the CT projection data p, reconstructing first CT image data fk=1, and on the basis of the first image data fk=1iteratively generating k+1-th CT-image data according to the formula:in-line-formulae description="In-line Formulae" end="lead"?fk+1=fk−α(Q(Pfk−p)+βR(fk))in-line-formulae description="In-line Formulae" end="tail"?until the standard ∥fk+1−fk∥2is ≦n, with the reconstruction operator Q containing a noise weighting according to Q=B·Wstatist.·H. Aside from suppressing “cone” artifacts, the proposed method of at least one embodiment indicates a significant reduction in the image noise even after a few iterations.

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Sunnegårdh et al., “Regularized Iterative Weighted Filtered Backprojection for Helical Cone-Beam CT.” Proc. Fully 3D Meeting and HPIR Workshop 2007, p. 237-240.

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