Patent ID: 9081070
Filing Date: 2015-07-14
Classification: G01R

Abstract:
1. A tesseral shim coil for shimming the magnetic field of a magnetic resonance system by generating the spherical harmonics of the sine and cosine type of the magnetic field, the tesseral shim coil comprising: at least four saddle coils, wherein the sum of the azimuthal span of the at least four saddle coils is less than 360 degrees, the tesseral shim coil comprises a first and a second set of saddle coils distinct from the first set of saddle coils, wherein the first and second set of saddle coils shim the same degree and order of the spherical harmonics of the magnetic field, wherein the first set of saddle coils shim the spherical harmonic of the sine type of the magnetic field, wherein the second set of saddle coils shim the spherical harmonic of the cosine type of the magnetic field and the first and second sets of shim coils are combined into a single coil layer.