Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2006-07-11
2006-07-11
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S309000
Reexamination Certificate
active
07075302
ABSTRACT:
A system composed of multiple transmit coils with corresponding RF pulse synthesizers and amplifiers is disclosed. A method of designing RF pulses specific to each transmit coil to induce spatiotemporal variations in a composite B1field is also disclosed. The present invention supports faithful production of desired excitation profiles and accommodates the use of any coil array geometry. The present invention also supports reduction in excitation pulse length. Through effective B1field maps for each transmit coil, mutual coupling and other inter-coil correlations are accounted for in the RF pulse design.
REFERENCES:
patent: 5143688 (1992-09-01), Mansfield
patent: 5349296 (1994-09-01), Cikotte et al.
patent: 6275722 (2001-08-01), Martin et al.
patent: 6556010 (2003-04-01), Van Den Brink et al.
patent: 6801037 (2004-10-01), Zhang
patent: 6828790 (2004-12-01), Katscher et al.
patent: 6888350 (2005-05-01), Deimling
patent: 6968225 (2005-11-01), Vu
Pauly, J. et al., A k-space analysis of small-tip-angle excitation, Journal of Magnetic Resonance, 1989, vol. 81, pp. 43-56.
Pauly, J. et al., A linear class of large-tip-angle selective excitation pulses, Journal of Magnetic Resonance, 1989, vol. 82, pp. 571-587.
Hardy, C.J. et al., Spatial localization in two dimensions using NMR designer pulses, Journal of Magnetic Resonance, 1989, vol. 82, pp. 647-654.
Bottomley, P.A. et al., PROGRESS in efficient three-dimensional spatially localized in vivo 31P NMR spectroscopy using mulitdimensional spatially selective (p) pulses, Journal of Magentic Resonance, 1987, vol. 74, pp. 550-556.
Spielman, D. et al., 1H spectroscopic imaging using a spectral-spatial excitation pulse, Magnetic Resonance in Medicine, 1991, vol. 18, pp. 269-279.
Feinberg, D.A. et al., Inner volume MR imaging: technical concepts and their application, Radiology, 1985, vol. 156, pp. 743-747.
Meyer, C. et al., Selective excitation for fast imaging, Proceedings of the Second European Congress of NMR in Medicine and Biology, 1998, p. 14.
Dumoulin, C. et al., Quantitative measurement of blood flow using cylindrically localized Fourier velocity encoding, Magnetic Resonance in Medicine, 1991, vol. 21, pp. 242-250.
HU, B.S. et al., Localized real-time velocity spectra determination, Magnetic Resonance in Medicine, 1993, vol. 30, pp. 393-398.
Bornert, P. et al., Curved slice imaging, Magnetic Resonance in Medicine, 1996, vol. 36, pp. 932-939.
Yang, G.Z. et al., Three-dimensional coronary MR angiography using zonal echo planar imaging, Magnetic Resonance in Medicine, 1998, vol. 39, pp. 833-842.
Rieseberbg, S. et al., Two-dimensional spatially-selective RF excitation pulses in echo-planar imaging, Magnetic Resonance in Medicine, 2002, vol. 47, pp. 1186-1193.
Hardy, C.J., NMR selective excitation of bent slices, Proceedings of the 11thScientific Meeting of ISMRM, 1992, p. 3911.
Glover, G.H. et al., Reduction of susceptibilty effects in BOLD fMRI using tailored RF pulses, Proceedings of the ISMRM 6thScientific Meeting, 1998, p. 298.
Stenger, V.A. et al., Three-dimensional tailored RF pulses for the reduction of susceptibility artifacts in T*2-weighted functional MRI, Magnetic Resonance Medicine, 2000, vol. 44, pp. 525-531.
Hayes, C.E. et al., An efficient highly homogneous radiofrequency coil for whole-body NMR imaging at 1.5T, Journal of Magnetic Resonance, 1985, vol. 63, pp. 622-628.
Glover, G.H. et al., Comparison of linear and cirular polarization for magnetic resonance imaging, Journal of Magnetic Resonance, 1985, vol. 64, pp. 255-270.
Collins, C.M. et al., SAR and B1 field distributions in a heterogeneous human head model within a birdcage coil, Magnetic Resonance in Medicine, 1998, vol. 40, pp. 847-856.
Ibrahim, T.S. et al., Effect of RF coil excitation on field inhomogeneity at ultra high fields: a field optimized TEM resonator, Magnetic Resonance Imaging, 2001, vol. 19, pp. 1139-1347.
Silver, M.S. et al., Selective spin inversion in nuclear magnetic resonance and coherent optics through an exact solution of the Bloch-Riccati equation, Physical Revision A, 1985, vol. 31, pp. 2753-2755.
Conolly, S. et al., A selective adiabatic spin-echo pulse, Journal of Magnetic Resonance, 1989, vol. 83, pp. 324-334.
Foo, T.K.F. et al., Reduction of RF penetration effects in high field imaging, Magnetic Resonance in Medicine, 1992, vol. 23, pp. 287-301.
Vaughan, J.T. et al., High frequency volume coils for clincial NMR imaging and spectroscopy, Magnetic Resonance in Medicine, 1994, vol. 32, pp. 206-218.
Alsop, D.C. et al., A spiral volume coil for improved RF field homogeneity at high static magnetic field strength, Magnetic Resonance in Medicine, 1998, vol. 40, pp. 49-54.
Duensing, G.R. et al., Transceive phased array desgined for imaging at 3.0T, Proceedings of the ISMRM 6thScientific Meeting, 1998, p. 441.
Roemer, P.B. et al., The NMR phased array, Magnetic Resonance in Medicine, 1990, vol. 16, pp. 192-225.
Pruessmann, K.P. et al., SENSE: sensitvity encoding for fast MRI, Magnetic Resonance in Medicine, 1999, vol. 42, pp. 952-962.
Sodickson, D.K. et al., Simultaneous acquistion of spatial harmonics (SMASH): fast imaging with radiofrequency coil arrays, Magnetic Resonance in Medicine, 1997, vol. 38, pp. 591-603.
Zhu, Y. et al., Imaging with an array of RF coils—a space-frequency approach, Proceedings of the ISMRM 9thScientific Meeting, 2001, p. 1797.
General Electric Company
Shrivastav Brij B.
Ziolkowski Patent Solutions Group, SC
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