Multi-echo NMR imaging method

Details Multi-echo NMR imaging method Multi-echo NMR imaging method

1991-12-13

1992-11-10

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

051627370

ABSTRACT:
A multi-echo NMR imaging method of obtaining images separated from each other with respect to two kinds of chemical shifts, typically, a fat image and a water image, includes performing the measurement of an object to be examined through a multi-echo sequence in which phase differences of .theta..sub.1 .noteq.n.pi. and .theta..sub.2 =2n.pi. (n=.+-.1, .+-.2, ---) are respectively produced for first and second echoes between two kinds of spins to be separated from each other, deriving first and second complex images of the object from the first and second echoes, respectively, performing the measurement of a phantom exhibiting one of the chemical shifts through the multi-echo sequence and deriving third and fourth complex images of the phantom, eliminating phase errors due to a static magnetic field inhomogeneity from the first and second images using phase data of the third and fourth images respectively, and eliminating phase error due to a magnetic permeability distribution to the object.

REFERENCES:
patent: 4581582 (1986-04-01), Redington
patent: 4628262 (1956-12-01), Maudsley
patent: 4739266 (1987-04-01), Kunz
patent: 4760339 (1988-07-01), Yamamoto et al.
patent: 4833408 (1989-05-01), Yamamoto et al.
"Spin Echo Imaging of Multiple Chemical Shifts" by J. A. B. Lohman et al., Mag. Resonance in Medicine, 5, Jul. (1987), pp. 83-86.
"Resolution of NMR Chemical Shift Images Into Re and Im Components" by Yamamoto et al., Phys. Med. Biol. 1986, vol. 7, pp. 713-720.
"Separation of True Fat & Water Images by Correcting Mag. Field Inhomogeneity in Situ" by Yeung et al. Radiology, vol. 159, No. 3, pp. 783-786.

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