Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1989-04-03
1990-07-10
Myracle, Jerry W.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, G01R 3320
Patent
active
049409417
ABSTRACT:
A method of high-speed magnetic resonance imaging in which the object to be imaged is placed in a high static magnetic field. Nuclear spins are excited in an image area by applying a pulse of radio frequency magnetic field. Optionally, a first gradient field, termed a slice selection gradient, may be applied in conjunction with the RF excitation pulse such that spins are excited only in a selected plane of the object. Following an encoding pulse sequence and rephasing of the nuclear spins by the application of a 180.degree. radio frequency pulse, mutually orthogonal phase-encoding and readout gradients are alternatively applied in the image plane to effect a traversal through spatial frequency domain (k-space). In a preferred embodiment of the invention, the readout gradient is applied as a continuous sinusoidal wave, resulting in a slight overlap between the phase-encoding and readout gradients. If phase errors vary slowly in time, only a partial k-space trajectory is required. Chemical shift is eliminated either by the application of a suppression pulse of RF field or by tailoring the frequency spectrum of the rephasing pulse so as to preclude rephasing of one or other of the chemical moieties.
REFERENCES:
patent: Re32712 (1988-07-01), Likes
patent: 4355282 (1982-10-01), Young et al.
patent: 4509015 (1985-04-01), Ordidge et al.
patent: 4794337 (1988-12-01), Twieg
Crookes et al., "Echo Planar Imaging at 0.35T with One Half of a Data Set", 5th Annual Mtg. of Soc. of Mag. Resonance, Aug. 19-22, 1986, pp. 946-947.
Crookes et al., "Manipulation of T2 Contrast in Echo Planar Imaging at 0.35T", 5th Annual Mtg. of Soc. of Mag. Resonance, Aug. 19-22, 1986, pp. 948-949.
Feinberg et al., "Echo Planar-Inner Volume Imaging at 0.35T", 5th Annual Mtg. of Soc. of Mag. Resonance, Aug. 19-22, 1986, p. 950.
Feinberg et al., "Halving Imaging Time at 0.35T in 2-D Ft Multi-Section, Multi-Echo MRI", 5th Annual Mtg. of Soc. of Mag. Resonance, Aug. 19-22, 1986, pp. 951-952.
Advanced NMR Systems, Inc.
Myracle Jerry W.
O'Shea Kevin D.
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