Method for producing CT images of an examination object...

Details Method for producing CT images of an examination object... Method for producing CT images of an examination object...

2007-02-27

2007-02-27

Thomas, Courtney (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S901000

Reexamination Certificate

active

11019630

ABSTRACT:
A method and a CT unit are proposed for producing CT images of an examination object having a periodically moving subregion, preferably a beating heart, by multi-planar reconstruction. Subsequent to joining the axial images with pixels from a number of partial volumes calculated for the rest phases, a reduction takes place to reduce artifacts occurring in overlap regions. This is done by carrying out threshold value formation in the zone of the boundary regions of the partial volumes with result image Dz. A pixel-oriented median filtering then occurs, resulting in image Mz. A differential value image is then produced using Fz=Dz−Mz. Subsequently, two-dimensional lowpass filtering is applied to Fzto produce a result image Gz. Finally, a calculation of Bz−Gzis used to form the final image Ez.

REFERENCES:
patent: 6041132 (2000-03-01), Isaacs et al.
patent: 6047039 (2000-04-01), Flohr
patent: 6434215 (2002-08-01), Cesmeli
patent: 6466640 (2002-10-01), Taguchi
CT Angiography: In Vitro Comparison of Five Reconstruction Methods, Addis et al., Nov. 2001, American Roentgen Ray Society.
Willi A. Kalender, “Computer-tomographie”, ISBN 3-89578-082-0, Chapter 6, pp. 146-157.

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