Beam-hardening and attenuation correction for...

X-ray or gamma ray systems or devices – Specific application – Computerized tomography

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C378S207000

Reexamination Certificate

active

07453974

ABSTRACT:
In CSCT, an exact reconstruction of a scattering function for each voxel is not known for polychromatic primary radiation. According to an exemplary embodiment of the present invention, a beam hardening compensation is performed prior to reconstruction allowing to perform a quasi-exact reconstruction on the basis of the primary radiation mean attenuation values are determined, from which an equivalent water thickness is derived. From the equivalent water thickness an energy shift is calculated, which is used to correct the initial mean energy of the scatter radiation. Furthermore, a CT reconstruction may be performed prior to a CSCT reconstruction allowing for a beam-hardening correction. Advantageously, this may allow for an improved image quality and an improved resolution of the scatter function.

REFERENCES:
patent: 3965358 (1976-06-01), Macovski
patent: 4149081 (1979-04-01), Seppi
patent: 4751722 (1988-06-01), Harding et al.
patent: 5335260 (1994-08-01), Arnold
patent: 5602895 (1997-02-01), Fivez et al.
patent: 6075877 (2000-06-01), Takeo
patent: 6157703 (2000-12-01), Solomon et al.
patent: 6320931 (2001-11-01), Arnold
patent: 6507633 (2003-01-01), Elbakri et al.
patent: 7065234 (2006-06-01), Du et al.
patent: 7248726 (2007-07-01), Sasada
patent: 2002/0085671 (2002-07-01), Sakaida
patent: 10252662 (2004-05-01), None
patent: WO2005091225 (2005-09-01), None
Schlomka et al., Novel Concept for Coherent Scatter X-ray Computed Tomography in Medical Applications, Penetrating Radiation Systems and Applications II, Proceedings of SPIE vol. 4142, pp. 218-224.
Nisar et al., Coherent Scatter X-ray Imaging of Plastic/Water Phantoms, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imgaging, Materials Processing, and Education, Proc. of SPIE vol. 5578, pp. 445-453.
Schneider et al., Coherent Scatter Computed Tomography Applying a Fan-Beam Geometry, Medical Imgaing 2001: Physics of Medical Imaging, Proceedings of SPIE vol. 4320, pp. 754-763.
Casteele et al., An Energy-based Beam Hardening Model in Tomography, Physics in Medicine and Biology, Institute of Physics Publishing, 47, 2002, pp. 4181-4190.
Schlomka et al., Novel Concept for Coherent Scatter X-ray Computed Tomography in Medical Applications, Penetrating Radiation Systems and Applications II, Proceedings of SPIE vol. 4142, 2000, pp. 218-224.
Nisar et al., Coherent Scatter X-ray Imaging of Plastic/Water Phantoms, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imgaging, Materials Processing, and Education, Proc. of SPIE vol. 5578, 2004, pp. 445-453.
□□Schneider et al., Coherent Scatter Computed Tomography Applying a Fan-Beam Geometry, Medical Imgaing 2001: Physics of Medical Imaging, Proceedings of SPIE vol. 4320, 2001, pp. 754-763.
Gerhard Martens et al: “Coherent X-ray Scatter Imaging for Foodstuff Contamination Detection”; Proc SPIE In. Soc. Opt Eng;Proceedings of SPIE-The Intl Society for Optical Engineering 1194 Publ. by Society of Photo-Optical Instrumentation Engineers, Bellingham, WA, USA, vol. 2092, Oct. 3, 1993, pp. 387-398, XP002328194.
Schneider S. M. et al: Coherent Scatter Computed Tomography Applying a Fan-Beam Geometry:; Proceedings of the SPIE, Bellingham, WA, US; vol. 4320, Feb. 18, 2001; pp. 754-763, XP008004551.
McDavid W. D. et al: “Correction for Spectral Artifacts in Cross-Sectional Reconstruction From X-Rays.”' vol. 4, No. 1, Jan. 1977; pp. 54-57, XP002328195.
Harding G. et al: “Energy-Dispersive X-ray Diffraction Tomography”; Phys. Med. Biol., 1990, vol. 35, No. 1 33-41.
Katsevich: “Analysis of an Exact Inversion Algorithm for Spiral Cone-Beam CT”; Phys. Med. Biol., vol. 47, pp. 2583-2597, 2002.
Patch S. K.: “Computation of Unmeasured Third-Generation VCT Views From Measured View”; IEEE Trans. Med. Img. MI-21, pp. 801-813, Jul. 2002.
Defrise, M. et al: “Improved 2D Rebinning of Helical Cone-Beam CT Data Using John's Equation”; Proc. 2002 IEEE Nuclear Scinece and Medical Imaging Symposium, Norfolk, VA; Paper M10-74.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Beam-hardening and attenuation correction for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Beam-hardening and attenuation correction for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Beam-hardening and attenuation correction for... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4033349

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.