MAGNETIC RESONANCE IMAGING DEVICE

摘要

An open-type magnetic resonance imaging device provides uniformity of a magnetic field without the necessity of lowering the degree of openness, and without increasing the superconducting wire material. The device includes at least one pair of main coils; at least one pair of shield coils; a pair of annular first magnetic substances disposed on an inner radial side of the main coils so that the first magnetic substances are plane symmetrical to each other; and second magnetic substances as protrusion portions disposed on an outer circumferential side of an end surface of the first magnetic substances on an opposite side of the first magnetic substances.

主权项

1. A magnetic resonance imaging device comprising:
at least one pair of main coils that has a center axis coaxial to each other and that is plane symmetrical to each other with respect to a plane perpendicular to the center axis; at least one pair of shield coils that is disposed on an outer radial side of the main coils and on an opposite plane side so that the shield coils are coaxial to the main coils and are plane symmetrical to each other with respect to the plane, the shield coils generating a magnetic field opposite to that of the main coils; a pair of annular first magnetic substances disposed on an inner radial side of the main coils so that the first magnetic substances are plane symmetrical to each other with respect to the plane; and second magnetic substances as protrusion portions disposed on an outer circumferential side of an end surface of the first magnetic substances on an opposite side to the plane.