Magnetic resonance imaging and spectroscopy using an excitation

Details Magnetic resonance imaging and spectroscopy using an excitation Magnetic resonance imaging and spectroscopy using an excitation

1989-06-22

1991-01-15

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

049856774

ABSTRACT:
A method of obtaining multi-dimensional spatially-selective magnetic resonance signals from a body includes applying a static magnetic field (Bo) to said body thereby aligning nuclear spins along an axis (z), and applying one or more time-varying magnetic gradients (Gx(t), Gy(t), Gz(t)) during a time period, T. During the time period, T, an RF excitation pulse (B.sub.1) is applied to said body to tip said nuclear spins, said RF excitation pulse being related to said modulated magnetic gradients by a first spatial frequency weighting function (W(k)(t)) whereby magnetic resonance signals transmitted by said tipped nuclear spins are spatially selective in multi dimensions. The resulting magnetic resonance signals are then detected to provide the multi-dimensional spatially-selective signals.

REFERENCES:
patent: 4307343 (1981-12-01), Likes
patent: 4642567 (1987-02-01), Kaplan
J. Pauly, D. Nishimura, and A. Macovski "A k-Space Analysis of Small-Tip-Angle Excitation", Journal of Magnetic Resonance 81, 43-56, 1989.
C. H. Meyer, J. Pauly, A. Macovski, and D. Nishimura, abstract of "Selective Excitation for Fast Imaging", Second European Congress of NMR in Medicine and Biology, Berlin, Jun. 23-26, 1988.

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