PROBLEM TO BE SOLVED: To acquire an image of high quality even with an imaging sequence or a magnet liable to be affected by residual magnetic field by reducing artifacts due to a fluctuation of irregular magnetic field in the residual magnetic field.SOLUTION: A magnetic resonance imaging apparatus is provided which comprises a shimming means which carries out shimming to adjust uniformity of a magnetic field by means of a predetermined shimming sequence and a measurement controlling means which controls measurement of echo signals from a subject arranged within a static magnetic field by means of a predetermined imaging sequence. The shimming means carries out shimming by adding a residual magnetic field reducing pulse, namely, a gradient magnetic field waveform having a form imitating at least a part of a gradient magnetic field waveform of the imaging sequence, to the shimming sequence.COPYRIGHT: (C)2011,JPO&INPIT【課題】 残留磁場の影響を受けやすい撮像シーケンスや磁石においても、残留磁場における不整磁場の変動に基づくアートファクトを低減して、良質な画像を得る。【解決手段】 磁場の均一度を調整するシミングを、所定のシミングシーケンスを用いて行うシミング手段と、所定の撮像シーケンスを用いて、静磁場中に配置された被検体からのエコー信号の計測を制御する計測制御手段と、を備え、シミング手段は、撮像シーケンスの傾斜磁場波形の少なくとも一部を模した形状を有する傾斜磁場波形を、残留磁場低減パルスとして、シミングシーケンスに付加してシミングを行う。【選択図】 図8
