Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1989-08-29
1991-07-02
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
050288717
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 slicing gradient magnetic field Gs whose strength condition is set to obtain a predetermined view angle .theta.=tan-1(Gs/Gr) for reducing chemical shift artifacts upon generation of the read gradient magnetic field Gr.
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Cho et al., "Total Inhomogeneity Correction Including Chemical Shifts and Susceptibility by Viewing Tilting" Medical Physics, vol. 15, No. 1, Jan./Feb. 1988, pp. 7-11.
Kabushiki Kaisha Toshiba
Tokar Michael J.
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