Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2006-05-09
2006-05-09
Gutierrez, Diego (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S307000
Reexamination Certificate
active
07042220
ABSTRACT:
An method for producing magnetic resonance imaging data is disclosed. An example embodiment of the method includes acquiring a series of M images at a plurality of echo times using a multi-echo pulse sequence. A compensation gradient is added as a blipped gradient in the slice direction before the first image acquisition and between each subsequent image acquisitions to compensate for static magnetic field inhomogeneities. The method also includes repeating the step of acquiring the series of M images N times. The compensation gradient is set to a predetermined value for each acquisition. The method further includes combining the N acquired images for each of the M echo times to obtain M corrected images, computing a map of T2* values from the M corrected images, and storing data representing the N acquired images and the M corrected images. Systems and computer readable media for implementing the method are also disclosed.
REFERENCES:
patent: 5351006 (1994-09-01), Sumanaweera et al.
patent: 6157192 (2000-12-01), Cordes
patent: WO 03/098233 (2003-11-01), None
Yang QX et al., “Multi-Gradient Echo with Susceptibility Inhomogeneity Compensation (MGESIC): Demonstration of fMRI in the Olfactory Cortex at 3.0 T”, Magn Reson in Med 37:331-335 (1997).
Yang QX et al., “Removal of Local Field Gradient Artifacts in T2*-Weighted Images at High Fields by Gradient-Echo Slice Excitation Profile Imaging”, Magn Reson in Med 39:402-409 (1998).
Constable RT and Spencer DD, “Composite Image Formation in z-Shimmed Functional MR Imaging”, Magn Reson in Med 42:110-117 (1999).
Song AW, “Single-Shot EPI With Signal Recovery From the Susceptibility-Induced Losses”, Magn Reson in Med 46:407-411 (2001).
Yang, et al., Removal of Local Field Gradient in T2*-Weighted Images at High Fields by Gradient-Echo Slice Excitation Profiled Imaging, MRM 39: 402-409 (1998).
Yang, et al., Removal of Local Field Gradient Artifacts in T2* Measurement and T2* Contrast as High Field, ISMRM (1998).
Liu, et al., the Measured T2* of human brain with macroscopic field inhomogeneity compensation at 7 Tesla, Proc. Intl. Soc. Mag. Reson, Med 9, p. 1352, (2001).
Imaging Notes, Part IV, BME 483, MRI Notes (10 pages).
Wagshul, Pulse Sequences, Stony Brook University, Dept. of Radiology (36 pages).
Watts, et al., Magnetic Resonance Imaging: Physical Principles, Weill Medical College of Cornell University (35 pages).
Schmalbrock Petra
Truong Trong-Kha
Calfee Halter & Griswold LLP
Gutierrez Diego
Shipman Jeremiah
The Ohio State University
LandOfFree
Magnetic resonance imaging system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic resonance imaging system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic resonance imaging system and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3529040