Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1989-08-16
1990-09-25
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
36441313, G01R 3320
Patent
active
049596101
ABSTRACT:
A magnetic resonance apparatus acquires a magnetic resonance signal matrix as follows. While a gradient field is applied to an object to be examined, a plurality of selective inversion pulses having different frequencies as high-frequency fields are sequentially applied to the object. Thereafter, a non-selective excitation pulse as a high-frequency field is applied to the object without application of a gradient field. In addition, a magnetic resonance signal generated upon application of the non-selective excitation pulse is acquired. Such a series of sequences are repeated a plurality of times, while the frequencies of the selective inversion pulses are sequentially selected to cause a magnetization vector of a nuclear spin of an area corresponding to either of "-1" and "1" an Hadamard matrix to be inverted by each selective inversion pulse. Chemical shift information is obtained by transforming a magnetic resonance signal matrix thus acquired in an aligning direction of the magnetic resonance signal matrix by an inverse Hadamard transform, and transforming the transformed matrix in a time base direction by an inverse Fourier transform.
REFERENCES:
patent: 4609872 (1986-09-01), O'Donnell
patent: 4689567 (1987-08-01), Maudsley
Journal of Magnetic Resonance 80, 162-167, (1988), Bolinger et al., Oct. 15, 1988.
Journal of Magnetic Resonance 66, 283-294; R. J. Ordidge et al., Feb. 1, 1986.
Journal of Magnetic Resonance 76, 155-161, S. Muller et al., Jan. 1988.
Kabushiki Kaisha Toshiba
O'Shea Kevin D.
Tokar Michael J.
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