Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1989-01-19
1990-08-14
Williams, Hezron E.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, 128653A, G01R 3320
Patent
active
049490427
ABSTRACT:
A magnetic resonance imaging system is adapted to achieve the imaging of magnetic resonance signals detected from an object by applying a high frequency magnetic field and gradient field to the object in a homogeneous static field in accordance with a predetermined pattern and includes a data pick-up section and image processing section. The data pick-up section is of such a type that, with the use of a predetermined pulse sequence so time-adjusted that a phase difference between two predetermined substances somewhat differing in their magnetic resonance frequency due to a chemical shift is .pi./2 or -.pi./2 on a predetermined time, picks up all magnetic resonance data necessary for reconstruction of an image of a slice excited by the high frequency field into a magnetic resonance within a period of time in which that predetermined nuclear magnetization of the slice is relaxed due to the relaxation of a transverse magnetization. The image processing section obtains a magnetic resonance image of at least one of the two substances gained, in a manner separated into real and imaginary part of image information, by subjecting mangetic resonance data picked up by the data pick-up section to a two-dimension complex Fourier transformation. It is thus possible to obtain a magnetic resonance image of at least one of the two substances in a very small period of time.
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Kanayama Shoichi
Kuhara Sigehide
Kabushiki Kaisha Toshiba
O'Shea Kevin D.
Williams Hezron E.
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