Importance

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Abstract

For the purpose of reducing second-order static magnetic field components in an MRI apparatus, a first circular loop coil C1 and a second circular loop coil C2 are disposed at positions spaced in a static magnetic field B0 direction to be symmetrical with respect to a center Z0 of an imaging region of an MRI apparatus 100. Similarly, a third circular loop coil C3 and a fourth circular loop coil C4 are disposed. A first corrective magnetic field bz1 and a second corrective magnetic field bz2 are generated in the same direction by the first and second circular loop coils C1 and C2, and a third corrective magnetic field bz3 and a fourth corrective magnetic field bz4 are generated in the same direction and opposite to the first corrective magnetic field bz1 by the third and fourth circular loop coils C3 and C4. The second-order components of the static magnetic field B0 are corrected by the corrective magnetic fields bz1-bz4.

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First Claim