Method and device for spectroscopic magnetic resonance imaging

Details Method and device for spectroscopic magnetic resonance imaging Method and device for spectroscopic magnetic resonance imaging

1997-12-23

2000-04-04

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01L 300

Patent

active

060465891

ABSTRACT:
A method for magnetic resonance imaging of a density distribution of a first substance and a second substance in a part of a body which is arranged in a substantially uniform, steady magnetic field, said first substance having a J-coupling. In order to image the contribution to the MR spectrum by said first substance having the J-coupling separately from the contribution to the MR spectrum by the second substance, repetition of refocusing pulses is used for the generating of the spin echo signals, so that in the direction of a first dimension of a data matrix, in which the measured values are arranged, a phase modulation of 180.degree. occurs in the successive values. Furthermore, the method according to the invention utilizes spatial encoding in which the maximum strength of a phase encoding gradient is equal to half the maximum strength of a corresponding phase encoding gradient used in a customary phase code, so that the field of vision is doubled in comparison with the customary field of vision. After Fourier transformation and integration of the MR spectrum, two separate images of the density distribution of the first substance and the second substance are thus obtained. Lactate is an example of a substance having a J-coupling. Fat is an example of a second substance.

REFERENCES:
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patent: 5570019 (1996-10-01), Moonen et al.
patent: 5617861 (1997-04-01), Ross et al.
By A. Haase et al, .sup.1 H NMR Chemical Shift Selective--(Chess) Imaging, Physics in Medicine and Biology, No 30 1985, p. 341-344.

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