Magnetic resonance imaging system

Details Magnetic resonance imaging system Magnetic resonance imaging system

1989-08-29

1991-01-08

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

049839187

ABSTRACT:
A magnetic resonance imaging system includes a static magnetic field generating section, a gradient magnetic field applying section, an RF pulse applying section, a sequence control section, a receiving section, and an imaging processing section. The sequence control section controls a sequence so as to generate a 180.degree. pulse at a timing at which a peak of the 180.degree. pulse appears at t=TE'/2, assuming that TE'=TE-n.tau.c (where TE is the echo time for a proton, .tau.c is the period in which phases of spins of water and fat match with each other and which is obtained on the basis of a chemical shift amount of protons of water and fat, and n is an integer of 1 or more), and a peak of a 90.degree. pulse appears at t-0, generate a read gradient magnetic field Gr whose strength condition is set to cause an echo peak to appear at t=TE=TE'+n.tau.c, and generate a second 180.degree. pulse at T.pi.2 for an echo time TE2' for a second MR echo signal

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Cho et al., "Total Inhomogeneity Correction including Chemical Shifts and Susceptibility by View Angle Tilting", Medical Physics 15(1), Jan./Feb. 1988, pp. 7-11.

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