Nuclear magnetic resonance systems

Details Nuclear magnetic resonance systems Nuclear magnetic resonance systems

1981-07-15

1984-05-15

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324318, G01R 3308

Patent

active

044490976

ABSTRACT:
Nuclear magnetic resonance methods have been proposed for examination of large bodies, including medical examination of patients. These include so-called steady state free precession methods. Such methods involve alternating excitation of a region of the body in such a way that an equilibrium condition is established at which a mean resonance signal is detectable. Typically for excitation of a planar region a radio frequency excitation field is provided in the presence of a field having an alternating gradient so that equilibrium is only reached in the plane. It is now proposed to achieve the same result by the application of two radio frequency fields having opposing gradients and pulsed in alternation to balance substantially only in the plane and provide equilibrium only there. The fields are provided by respective sets of saddle shaped coils divided into pairs of unequal dimension (1a, 1b, 2a, 2b) to provide the respective gradients.

REFERENCES:
patent: 4015196 (1977-03-01), Moore
patent: 4339716 (1982-07-01), Young
"Image Formation by Nuclear Magnetic Resonance: The Sensitive-Point Method"; Journal of Applied Physics, vol. 47, No. 8, Aug. 1976, pp. 3709-3721.
"Display of Cross-Sectional Anatomy by Nuclear Magnetic Resonance Imaging", Hinshaw et al.; British Journal of Radiology, 51, 273-280, 1978.

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