Imaging method with back projection

Details Imaging method with back projection Imaging method with back projection

2005-06-24

2009-08-04

Glick, Edward J (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S019000, C378S901000, C382S131000

Reexamination Certificate

active

07570731

ABSTRACT:
The invention relates to an imaging method, especially a computerized tomography method, with which an object is penetrated by rays from different directions and measured values, which depend upon the intensity of the rays after penetrating the object, are acquired by a detector unit. From these measured values, an object image is reconstructed by means of back projection of measured-value-dependent back projection values. Therein, the object image is divided into overlapping, quasi-spherically symmetric image segments, each being defined by an image value and a quasi-spherically symmetric base function. Furthermore, during the back projection, the back projection values are added in proportions to the image values, wherein the proportion of a back projection value, which is added during the back projection to an image value, is dependent on a proportionality factor, which is equal to the average value of the line integrals of the base function belonging to the respective image value along those rays that have generated the measured value, on which the respective back projection value is dependent.

REFERENCES:
patent: 6002738 (1999-12-01), Cabral et al.
patent: 6529575 (2003-03-01), Hsieh
patent: 6654440 (2003-11-01), Hsieh
Kohler et al., SNR-Weighted ART Applied to Transmission Tomography, Oct. 2003, 2003 IEEE Nuclear Science Symposium Record, vol. 4, p. 2739-2742.
Matej et al., Practical Considerations for 3-D Image Reconstruction Using Spherically Symmetric Volume Elements, 1996, IEEE Transactions on Medical Imaging, vol. 15, No. 1, pp. 68-78.
Lewitt, Alternatives to voxels for image representation in iterative reconstruction algorithms, 1992, Physics in Medicine and Biology, vol. 37, No. 3, pp. 705-716.
Mueller, K., et al.; A Fast and Accurate Projection Algorithm for 3D Cone-Beam Reconstruction with the Algebraic Reconstruction Technique (ART); 1998; SPIE Medical Imaging Conference; pp. 1-9.
Mueller, K., et al., Rapid 3-D Cone-Beam Reconstruction with the Simultaneous Algebraic Reconstruction Technique (SART) Using 2-D Texture Mapping Hardware; 2000; IEEE Trans. on Medical Imaging; 19(12)1227-1237.
Mueller, K., et al.; Anti-Aliased Three-Dimensional Cone-Beam Reconstruction of Low-Contrast Objects with Algebraic Methods; 1999; IEEE Trans. on Medical Imaging; 18(6)519-537.

Affiliated with

Also associated with

Rating

Imaging method with back projection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Imaging method with back projection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging method with back projection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4058677