X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2007-12-20
2010-02-09
Glick, Edward J (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C378S018000
Reexamination Certificate
active
07660379
ABSTRACT:
The invention relates to a method for correcting truncation artifacts in reconstructing computer tomography recordings. The projection images of the computer tomography recordings are extended by extrapolation. An equivalent body is determined which in the peripheral region of the projection image attenuates the radiation emanating from a radiation source of the computer tomography according to the object to be examined, and the attenuation is determined outside the projection image for extrapolated image points. A smoothing of the signal of a projection data line is effected with a digital polynomial filter to reduce the noise portion of the signal. The truncated portion of the projection data line is computed from the smoothed signal of the projection data line by an extrapolation method.
REFERENCES:
patent: 6307909 (2001-10-01), Flohr et al.
patent: 7254259 (2007-08-01), Hsieh et al.
patent: 2002/0186809 (2002-12-01), Flohr et al.
patent: 2004/0066909 (2004-04-01), Lonn et al.
patent: 2008/0123806 (2008-05-01), Scholz
Beyer et al., Whole-Body 18F-FDG PET/CT in the Presence of Truncation Artifacts, Jan. 2006, The Journal of Nuclear Medicine, vol. 47, No. 1, pp. 91-99.
You et al., FBP algorithms for attenuated fan-beam projections, May 13, 2005, Inverse Problems, vol. 21, pp. 1179-1192.
Zellerhoff et al., Low contrast 3D-reconstruction from C-arm data, Published online Aug. 30, 2005, SPIE vol. 5745, pp. 646-655.
Scholtz et al., Correction of Truncation Artifacts in C-arm CT Images by Fan-Beam Extrapolation Using Savitzky-Golay Filter, Dec. 2, 2008, RSNA 2008, Presentation Code: SSJ24-06.
You, ReconAnalytical Class Reference, Copyright 2003-2005, available at http://www.cubic-imaging.com/CodeDoc/ImageRecon/class—recon—analytical.html.
Lascu et al., Electrocardiogram Compression and Optimal ECG Filtering Algorithms, Apr. 2008, WSEA Transactions on Computers, Issue 4, vol. 7, pp. 155-164.
Press et al., Numerical Recipes in C. The Art of scientific Computing, 2002, Second Edition, Second Edition, ISBN 0-512-43108-5, Chapter 14.8 Savitzky-Golay Smoothing Filters, pp. 650-655.
Savitzky et al., Smoothing and Differentiation of Data by Simplified Least Squares Procedures, Jul. 1964, Analytical Chemistry, vol. 36, No. 8, pp. 1627-1639.
B. Ohnesorge et al., “Efficient correction for CT image artifacts caused by objects extending outside the scan field of view”, Med. Phys. 27, vol. 1, , 2000, pp. 39 to 46.
K. Sourbelle et al., “Reconstruction from Truncated Projections in Cone-Beam CT using Adaptive Detruncation”, Paper #1506, RSNA 2003, pp. 1-3.
C. Penβel, “Hybrid Detruncation Algorithm for the Reconstruction of CT Data”, RSNA paper 2005, pp. 1-18.
J. Hsieh et al., “A novel reconstruction algorithm to extend the CT scan field-of-view”, Med. Phys. 31 (9), Sep. 2004, pp. 2385 to 2391.
J. Starman et al., “Extrapolating Truncated Projections Using 0th and 1st Moment Constraints”, RSNA 2004, and B. Scholz, Scientific Papers, pp. 1-2.
B. Scholz, “Verfahren zur Korrektur von Trunkierungsartefakten[Method for correcting truncation artifacts]”, earlier patent application 10 2006 014 629.8, Mar. 29, 2006.
A. Savitzky et al., “Smoothing and differentiation of data by simplified least squares procedures”, Anal. Chem. vol. 36, Jul. 1964, pp. 1627-1639.
Corbett John M
Glick Edward J
Siemens Aktiengesellschaft
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