Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2006-09-05
2008-12-02
Arana, Louis M (Department: 2831)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S319000
Reexamination Certificate
active
07459908
ABSTRACT:
A method of providing shim sheets for adjusting a magnetic field in a magnetic resonance device by passive shimming, comprises the steps of field mapping of a region of interest in the MR device for obtaining an uncorrected magnetic field distribution including field inhomogeneities, decomposing the field inhomogeneities into first and second order spherical harmonic functions, determining primary shim terms derived from the second order spherical harmonic functions, wherein the primary shim terms yield a passive shim field adapted to a targeted shim field, scaling optimized shim terms for increasing a similarity of the passive shim field with the targeted shim field, constructing modular shim sheets on the basis of the optimized shim terms, and mounting the modular shim sheets on a shim sheet carrier of the magnetic resonance device. Furthermore, an adjustment device for adjusting a magnetic field in a magnetic resonance device by passive shimming is described.
REFERENCES:
patent: 5045794 (1991-09-01), Dorri et al.
patent: 5532597 (1996-07-01), McGinley et al.
patent: 5635839 (1997-06-01), Srivastava et al.
patent: 5677854 (1997-10-01), Dorri
patent: 6181137 (2001-01-01), Havens et al.
patent: 6294972 (2001-09-01), Jesmanowicz et al.
patent: 6529005 (2003-03-01), Kasten et al.
patent: 6897750 (2005-05-01), Neuberth
Vanhamme et al., “MR spectroscopy quantitation: a review of time-domain methods”, NMR Biomed., vol. 14 (2001), pp. 233-246.
Mierisova et al., “MR spectroscopy quantitation: a review of frequency domain methods”, NMR Biomed., vol. 14 (2001), pp. 247-259.
Stoyanova et al., “NMR spectral quantitation by principal component analysis”, NMR Biomed., vol. 14 (2001), pp. 271-277.
Romeo et al., “Magnet Field Profiling: Analysis and Correcting Coil Design”, Magnetic Resonance in Medicine, vol. 1 (1984), pp. 44-65.
Jesmanowicz et al., “Local Ferroshims Using Office Copier Toner”, Intl. Soc. Mag. Reson. Med. 9 (2001), p. 617.
Hillenbrand et al., “High-Order MR Shimming: a Simulation Study of the Effectiveness of Competing Methods, Using an Established Susceptibility Model of the Human Head”, Appl. Magn. Reson., vol. 29 (2005), pp. 39-64.
Wilson et al., “Optimization of Static Field Homogeneity in Human Brain Using Diamagnetic Passive Shims”, Magnetic Resonance in Medicine, vol. 48 (2002), pp. 906-914.
Wilson et al., “Utilization of an Intra-Oral Diamagnetic Passive Shim in Functional MRI of the Inferior Frontal Cortex”, Magnetic Resonance in Medicine, vol. 50 (2003), pp. 1089-1094.
Cusack et al., “An evaluation of the use of passive shimming to improve frontal sensitivity in fMRI”, NeuroImage. vol. 24 (2005), pp. 82-91.
Konzbul et al., “Shim coils for NMR and MRI solenoid magnets”, Meas. Sci. Technol., vol. 6 (1995), pp. 1116-1123.
Brideson et al., “Determining Complicated Winding Patterns for Shim Coils Using Stream Functions and the Target-Field Method”, Concepts Magn. Reson., vol. 14 (2002), pp. 9-18.
Brideson et al., “Winding patterns for actively shielded shim coils with asymmetric target-fields”, Meas. Sci. Technol., vol. 14 (2003), pp. 484-493.
Gruetter et al., “Fast, Noniterative Shimming of Spatially Localized Signals, In Vivo Analysis of the Magnetic Field along Axes”, Journal of Magnetic Resonance, vol. 96 (1992), pp. 323-334.
Chen et al., “Measurement and automatic correction of high-order B0 inhomogeneity in the rat brain at 11.7 Tesla”, Magnetic Resonance Imaging, vol. 22 (2004), pp. 835-842.
Ugurbil et al., “Ultrahigh field magnetic resonance imaging and spectroscopy”, Magnetic Resonance Imaging, vol. 21 (2003), pp. 1263-1281.
Gruetter et al., “Resolution Improvements in in Vivo 1H NMR Spectra with Increased Magnetic Field Strength”, Journal of Magnetic Resonance, vol. 135 (1998), pp. 260-264.
Tkac et al., “In Vivo 1H NMR Spectroscopy of the Human Brain at 7 T”, Magnetic Resonance in Medicine, vol. 46 (2001), pp. 451-456.
Juchem et al., “Region and volume dependencies in spectral line width assessed by (1)H 2D MR chemical shift imaging in the monkey brain at 7 T”, Magnetic Resonance Imaging, vol. 22 (2004), pp. 1373-1383.
Pfeuffer et al., “Anantomical and functional MR imaging in the macaque monkey using a vertical large-bore 7 Tesla setup”, Magnetic Resonance Imaging, vol. 22 (2004), pp. 1343-1359.
Logothetis et al., “Functional imaging of the monkey brain”, Nature Neuroscience, vol. 2 (1999), pp. 555-562.
Pfeuffer et al., “High-field localized (1)H NMR spectroscopy in the anesthetized and in the awake monkey”, Magnetic Resonance Imaging, vol. 22 (2004), pp. 1361-1372.
Cusack et al., “New Robust 3-D Phase Unwrapping Algorithms: Applications to Magnetic Field Mapping and Undistorting Echoplanar Images”, NeuroImage, vol. 16 (2002), pp. 754-764.
Clare et al., “Requirements for Room Temperature Shimming of the Human Brain”, Magnetic Resonance in Medicine, vol. 55 (2006), pp. 210-214.
Muller-Bierl et al., “Numerical modeling of needle tip artifacts in MR gradient echo imaging”, Med. Phys., vol. 31 No. 3 (2004), pp. 579-587.
Muller-Bierl et al., “Compensation of magnetic field distortions from paramagnetic instruments by added diamagnetic material: Measurements and numerical simulations”, Med. Phys., vol. 32 No. 1 (2005), pp. 76-84.
Koch et al., “Adjustable Subject-Specific Passive Shims using Optimized Distributions of Bismuth and Zirconium”, Proc. Intl. Soc. Mag. Reson. Med., vol. 14 (2006), p. 519.
Wen et al., “An in Vivo Automated Shimming Method Taking into Account Shim Current Constraints”, MRM, vol. 34 (1995), pp. 898-904.
Spielman et al., “Quantitative Assessment of Improved Homogeneity Using Higher-order Shims for Spectroscopic Imaging of the Brain”, MRM, vol. 40 (1998), pp. 376-382.
Arana Louis M
Caesar Rivise Bernstein Cohen & Pokotilow Ltd.
Max-Planck-Gesellschaft zur Forderung der Wissenschaften E.V.
LandOfFree
Passive shimming for MR spectroscopy at high magnetic fields does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Passive shimming for MR spectroscopy at high magnetic fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Passive shimming for MR spectroscopy at high magnetic fields will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4047072