Ge Medical Systems Global Technology Company, LLC

Naotaka Adachi

Aki Yamazaki

Yoshihiro Oda

Mitsuhiro Bekku

The invention is intended to obtain optimal shim values even if slice planes are slanted with respect to the system-inherent coordinate system. The section for setting a plane for calculating shim values sets planes perpendicular to and a plane parallel with a slice plane in a system of coordinates x', y&#x2032;, and z&#x2032; perpendicular to the slice plane. The section for calculating shim values obtains shim values with regard to this slice plane in this coordinate system, based on data acquired by the data acquiring section. The coordinates converting section converts the thus obtained shim values to shim values in the system-inherent x-y-z coordinate system of the MRI apparatus.

Magnetic resonance imaging apparatus and method for setting shim values

An object of the present invention is to produce images devoid of band artifacts. Data acquisition in SSFP is repeated N times (where N denotes the power of 2) in order to acquire data fv(k), which ranges from data fv( ) to data fv(N&minus;1), from views v constituting a k-space. At this time, the phase of an RF pulse is varied based on an expression of 360&deg;&middot;v&middot;k/N. If an operator designates Fourier transform imaging, a Fourier transform is performed on data fv(k) relative to each of the phases indicated by the RF pulse in order to produce data Fv(n). If the operator does not designate Fourier transform imaging, the data fv(k) is regarded as the data Fv(n) as it is. Any of at least either of weighted addition and MIP processing and root-mean-square conversion selected by the operator is then performed on the data Fv(n) in order to produce data Av. An image is reconstructed based on the data Av.

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Tokyo, Japan

Naotaka Adachi