PROBLEM TO BE SOLVED: To maintain a steady state of a magnetization more satisfactorily even if there is a factor disturbing the steady state of the magnetization such as adjustment deviation of the center frequency of the radio frequency excitation pulse or a variation of the B0 magnetic field in case of acquiring data with a steady state free precession of a magnetization.SOLUTION: This magnetic resonance imaging apparatus are configured to acquire magnetic resonance data with obtaining a steady state free precession of the magnetization in a desired matter by applying plural excitation pulses having a same flip angle &alpha with a constant repetition time TR to an object, and each having a transmission phase varying by a variation amount (&pi+&Delta&phiv) determined based on a difference between a resonance frequency of a desired matter and the center frequency defined depending on the matter, wherein respective zero order moments of gradient magnetic field SS, PE, RO from each application time of the plural excitation pulses till a center time of a corresponding echo and gradient magnetic field from each center time of echoes till an application time of a following excitation pulse included in the gradient magnetic fields SS, PE, RO are zeros.COPYRIGHT: (C)2009,JPO&INPIT【課題】磁化の定常状態自由歳差運動を利用してデータ収集を行う場合に、B0磁場や励起パルスの中心周波数の調整ずれ等の定常状態を崩す要因があっても、より良好に磁化の定常状態を維持する。【解決手段】所望の物質の共鳴周波数と前記物質に応じて定まる前記中心周波数との差から決定された変化量(π+Δφ)で送信位相(PHASE)が変化する複数の励起パルスを同一のフリップ角αおよび一定の繰り返し時間TRで印加し、各励起パルスの印加時刻からエコーが生成される中心時刻までおよびエコーが生成される中心時刻から次の励起パルスの印加時刻までにおける傾斜磁場SS,PE,ROの0次モーメントがそれぞれゼロとなるように前記傾斜磁場SS,PE,ROを印加することによって前記所望の物質の磁化の定常状態自由歳差運動を得て磁気共鳴データを収集する。【選択図】図7
