Method and arrangement for determining a nuclear magnetization d

Details Method and arrangement for determining a nuclear magnetization d Method and arrangement for determining a nuclear magnetization d

1987-04-17

1988-08-23

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324311, G01R 3320

Patent

active

047663804

ABSTRACT:
The invention relates to a method and system for determining an image of a nuclear magnetization distribution in a body. In known methods, particularly in nuclear spin echo techniques, a resonance signal is generated which has high dynamics. In the method according to the invention dephasing is effected which is non-linear place-dependent or which is frequency-dependent within a spectroscopy distribution, as a result of which the generated resonance signal will have a much smaller amplitude. Since the non-linear dephasing applied within the distribution is known, a correction can be made for this after the determination of the measuring signals. The non-linear dephasing can be effected by means of excitation pulses and/or with subsequent nuclear spin echo pulses (also termed refocusing pulses) which have a frequency spectrum with a non-linear phase characteristic (possibly in the presence of a gradient magnetic field), or by means of a non-linear, place-dependent extra magnetic field, which can, for example, be applied during the preparation period. The non-linear extra magnetic field will preferably have higher order components, such as quadratic components. The reduction in signal dynamics to be achieved depends on the (frequency or) place-dependence of non-linear dephasing. If, for example, in an image of n.times.n pixels a non-linear, place-dependent extra magnetic field is used, which is dependent on two coordinates, then it is possible to achieve a maximum reduction in signal dynamics equal to .sqroot.n.times.n.

REFERENCES:
patent: 4443760 (1984-04-01), Edelstein

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