Magnetic resonance imaging apparatus

Details Magnetic resonance imaging apparatus Magnetic resonance imaging apparatus

1990-11-27

1994-08-16

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

053390326

ABSTRACT:
In a magnetic resonance imaging apparatus, a radiofrequency shielding body, which is disposed between the gradient magnetic field generating coils and the radio-frequency coil for interrupting electromagnetic coupling between the gradient magnetic field generating coils and the radio-frequency coil due to the radio-frequency pulse applied to the radio-frequency coil, is formed of a conductive material having a thickness less than the skin depth defined by 1/.sqroot. .pi. fo .mu. .sigma. where .pi. stands for the ratio of the circumference of a circle to its diameter, of stands for the Larmor frequency of atomic nuclei of an imaging object, .mu. stands for the conductivity of the conductive material and .sigma. stands for the magnetic permeability of the conductive material.

REFERENCES:
patent: 4642569 (1987-02-01), Hayes et al.
patent: 4871969 (1989-10-01), Roemer et al.
patent: 4879515 (1989-11-01), Roemer et al.
patent: 4924184 (1990-05-01), Yoda
patent: 4980641 (1990-12-01), Breneman et al.

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