Permanent magnet NMR imaging apparatus

Details Permanent magnet NMR imaging apparatus Permanent magnet NMR imaging apparatus

1983-05-02

1986-04-01

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324318, G01N 2408

Patent

active

045800987

ABSTRACT:
An NMR imaging apparatus is described having a desired imaging volume for imaging of biological tissue, said apparatus comprising bias means for generating a bias field, means for generating gradient fields, and radio frequency means for applying a pulse of electromagnetic radiation to the biological tissue and for detecting the resultant signals emitted from said tissue; wherein said bias means comprises a plurality of dipole ring magnets, each dipole ring magnet comprising a plurality of segments, each segment comprising an oriented, anisotropic permanent magnet material arranged in a ring so that there is a substantially continuous ring of permanent magnet material.

REFERENCES:
patent: 4498048 (1985-02-01), Lee
K. Halbach, "Design of Permanent Multipole Magnets with Oriented Rare Earth Colbalt Material", Nuclear Instruments & Methods 169 (1980).
M. Goldsmith et al., "NMR in Cancer:XVII. A Superconductive NMR Magnet for a Human Sample", Physiol. Chem. & Phys. 9 (1977).
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D. I. Hoult et al., "Electromagnet for Nuclear Magnetic Resonance Imaging", Rev. Sci. Instrum. 52(9), Sep. 1981.
D. I. Hoult, "Radio Frequency Coil Technology in NMR Scanning", R. F. Coil Technology, pp. 33-39.
P. Hanley, "Superconducting and Resistive Magnets in NMR Scanning", Magnets, pp. 41-49.
Technology/2, pp. 33-39, Jan./Feb. 1982.
"Nuclear Magnetic Resonance Imaging in Medicine", edited by Leon Kaufman, PhD. et al, New York (Chapter 3, pp. 30-52 and Chapter 4, pp. 53-67).
K. Halbach, "Physical and Optical Properties of Rare Earth Cobalt Magnets", NIM 187 (1981) 109.
K. Halbach, "Perturbation Effects in Segmented Rare Earth Cobalt Multiple Magnets", NIM 198 (1982) 213-215.
Charles G. Masi, (Magnicon Corp.), "Lodestone Technology Comes to NMR Imaging", Diagnostic Imaging, Apr. 1983, pp. 32-35.
Richard diMonda, Nuclear Magnetic Resonance Guideline Report--AHA Hospital Technology Series, vol. 2, No. 8, Mar. 1983.
R. D. Hay and C. G. Masi, New England Nuclear Corp., "A Variable Strength Permanent Magnet Dipole", Proceedings of the 1981 Linear Accelerator Conference, Oct. 19, 1981, pp. 84-86.

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