Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1999-02-08
2000-12-05
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V 300
Patent
active
06157192&
ABSTRACT:
A prescan process is performed in which an EPI pulse sequence acquires a series of pilot images. Each pilot image is acquired with a different slice selection refocusing gradient and a rephasing map is produced which indicates the optimal refocusing gradient to be used for each pixel. The rephasing map is used to determine the optimal refocusing gradient amplitudes to use in a subsequent scan to reduce signal drop out caused by susceptibility gradients.
REFERENCES:
patent: 5378985 (1995-01-01), Hinks
patent: 5770943 (1998-06-01), Zhou
patent: 5818229 (1998-10-01), Kanazawa
Multi-Gradient Echo with Susceptibility Inhomogeneity Compensation (MGESIC): Demonstration of fMRI in the Olfactory Cortex at 3.0 T, MRM 37:331-335 (1997), Yang, et al.
Reduction of T2* Dephasing in Gradient Field-Echo Imaging, Radiology 1989; 170:457-462, Haacke, et al.
The Influence of the Slice-Selection Gradient on Functional MRI of Human Brain Activation, JMR, Series B 103, 91-93 (1994), Frahm, et al.
Reduction of Susceptibility Artifacts in Gradient-Echo Imaging, MRM 23, 193-200 (1992), Cho, et al.
Removal of Local Field Gradient Artifacts in Gradient-Echo Images by Slice Excitation Profile Imaging (GESEPI) in High Field, Yang, et al.
Implementation of Dynamic Shimming for Multi-Slice Imaging, Magnetization, Reson. Syst. Research Lab, Stanford Univ., Morrell, et al.
Reduction of Image Distortion in the Presence of Metal, Depts of Radiol. & Physics, Vancouver BC Canada, McGowan, et al.
Correction of Dynamic B.sub.z -field Artifacts in EPI, Bio. Research Inst. Med. Col. Of Wi, Birn, et al.
Fourier Transform of Multi-Gradient Echo with Susceptibility Inhomogeneity Compensation (3DFT-MGESIC): Improved SNR and T.sub.2 * Weighting for MRI, Yang et al.
Functional MR Imaging using Gradient Echo EPI in the Presence of Large Static Field Inhomogeneities, Yale University, R.T. Constable.
--no title--Ctr for NMR Research, Dept. Of Radio.Yang, et al.
Direct Flash MR Imaging of Magnetic Field Inhomogeneities by Gradient Compensation, MRM 6, 474-480 (1988), Frahm, et al.
The Benefits of Increasing Spatial Resolution as a Means of Reducing Artifacts Due to Field Inhomogeneities, MRI vol. 6, pp. 585-590, 1988, Young et al.
Combined Gradient-Echo and Asymmetric Spin-Echo (GREASE): Functional MRI Comparisons and Uses, Bio. Research Inst. Med. Col. Of WI, Bandettini, et al.
Functional MR Imaging Using Gradient-Echo Echo-Planar Imaging in the Presence of Large Static Field Inhomogeneities, JMRI 1995: 5:746-752, R.T. Constable.
Arana Louis
Wisconsin Alumni Research Foundation
LandOfFree
Recovery of signal void arising from field inhomogeneities in ec does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recovery of signal void arising from field inhomogeneities in ec, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recovery of signal void arising from field inhomogeneities in ec will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-964852