Magnetic resonance imaging apparatus

Electricity: measuring and testing – Particle precession resonance – Spectrometer components

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G01R 3320

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active

053810937

ABSTRACT:
The MR imaging apparatus comprises an RF shield for interposed between the set of gradient coil and the RF coil. The RF shield is a cylinder which longitudinal axis is substantially coincident to the z-axis in which a static magnetical field is applied. The RF shield comprises two conductive sheet-members which are half-cylinder respectively and integrated into one cylinder. The sheet members have a plurality of generally C-shaped conductive loop portions respectively which are defined by nonconductive lines parallel to RF current flow induced therein by the RF coil and a single radial cut line respectively. The RF shield comprises a connecting means for electrically connecting the C-shaped conductive loop portions so that the C-shaped conductive loop portion in one of the sheet members and corresponding C-shaped conductive loop portion in the other sheet member can be formed into one circuit respectively and a current can circulate in said circuit in the same direction around a y-axis orthogonal to the z-axis.

REFERENCES:
patent: 4642569 (1987-02-01), Hayes et al.
patent: 4879515 (1989-11-01), Roemer et al.
patent: 4965521 (1990-10-01), Egloff

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