PROBLEM TO BE SOLVED: To easily create a pulse sequence for correcting a phase dependent on a speed of nuclear magnetization in the application of a gradient magnetic field with bipolar gradient magnetic field waveforms of the intensity equal to each other.SOLUTION: An MRI apparatus includes a gradient magnetic field waveform calculation part for creating a pulse sequence for correcting a phase dependent on a speed of nuclear magnetization in the application of a gradient magnetic field with a first gradient magnetic field waveform and a second gradient magnetic field waveform whose intensity is equal to that of the first gradient magnetic field, and polarity is different from that of the first gradient magnetic field. Referring to the pulse sequence created by imaging parameters input by a user, the gradient magnetic field waveform calculation part calculates a switching time of the first gradient magnetic field waveform and the second gradient magnetic field waveform for correcting the phase dependent on a speed of nuclear magnetization under a restriction of time that the bipolar gradient magnetic fields can be applied, and creates the bipolar gradient magnetic fields.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】互いに強度の等しい双極傾斜磁場波形にて、傾斜磁場印加時における核磁化の速度に依存した位相を補正するパルスシーケンスを簡便に作成する。【解決手段】ＭＲＩ装置は、第一の傾斜磁場波形と第一の傾斜磁場と強度が等しく極性が異なる第二の傾斜磁場波形にて、傾斜磁場印加時における核磁化の速度に依存した位相を補正するパルスシーケンスを生成する傾斜磁場波形算出部を備える。傾斜磁場波形算出部は、ユーザーが入力した撮像パラメータにて生成されたパルスシーケンスを参照し、双極傾斜磁場の印加可能時間の制約下で、核磁化の速度に依存した位相を補正する第一の傾斜磁場波形と第二の傾斜磁場波形の切り替え時間を算出し、双極傾斜磁場を生成する。【選択図】図３
