Method and apparatus for shimming a magnet system of a nuclear m

Details Method and apparatus for shimming a magnet system of a nuclear m Method and apparatus for shimming a magnet system of a nuclear m

1996-03-29

1997-03-25

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, G01V 300

Patent

active

056148275

ABSTRACT:
In a method and apparatus for shimming a magnet system of a nuclear magnetic resonance tomography system, an apparatus-specific matrix is determined, which indicates the effect on the magnetic field for each shim channel. A phase difference matrix is subsequently formed by means of calculation of the phase differences between three-dimensional spatially resolved nuclear magnetic resonance raw data sets obtained with different echo times. This phase of difference matrix gives the field deviation for each pixel. In this phase difference matrix, the phase differences between consecutive pixels are calculated in several spatial directions, thereby determining a phase error data set. Finally, on the basis of the predefined matrix and of this phase error data set, currents for the individual shim channels are determined.

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"Rapid Fully Automated, Arbitrary Volume, In Vivo Shimming," Webb et al., SMRM Abstracts 1990, p. 541.
"NMR Imaging Techniques and Applications: A Review," Bottomley, Rev. Sci. Instrum., vol. 53, No. 9, Sep. 1982, pp. 1319-1337.

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