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US 6,294,913 B1Granted
Compensation of variations in polarizing magnetic field during magnetic resonance imaging
AssigneeGE Medical Systems Global Technology Company, LLC
InventorsRichard Scott Hinks, Robert A. Kraft, Saban Kurucay
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Abstract
Monitor signals are acquired in an interleaved manner during a scan with an MRI system. Frequency changes caused by variations in the polarizing magnetic field B0 are measured using the monitor signals, and these measured frequency changes are employed to compensate image data acquired during the scan.
Claims15
A method for producing an image with a magnetic resonance imaging system, the steps comprising:
- a) performing a series of imaging pulse sequences in which a corresponding series of NMR image signals and NMR monitor signals are acquired;
- b) compensating the series of acquired NMR image signals for variations in a polarizing magnetic field B0 in the magnetic resonance imaging system using information derived from the series of acquired NMR monitor signals;
- and
- c) reconstructing an image using the compensated NMR signals.
1 more element
A magnetic resonance imaging system which comprises:
- a) means for producing a polarizing magnetic field B0 throughout a region;
- b) means for producing transverse magnetization in spins located throughout the region;
- c) means for acquiring NMR signals produced by transverse magnetized spins in the region;
- d) means for producing magnetic field gradients throughout the region;
- e) a pulse generator for operating elements b), c) and d) to perform a series of imaging pulse sequences in which each imaging pulse sequence produces an NMR image signal and a corresponding NMR monitor signal;
- f) means for acquiring the series of NMR image signals and their corresponding NMR monitor signals;
- g) means for compensating the series of acquired NMR image signals for variations in the polarizing magnetic field B0 using information derived from their corresponding acquired NMR monitor signal;
- and
- h) reconstruction means for producing an image from the compensated NMR signals.
6 more elements
Dependencies are inferred from the claim text.