MAGNETIC RESONANCE IMAGING DEVICE AND CONTROL METHOD FOR THE SAME
To suppress a flow artifact and to acquire an image without the flow artifact regardless of speed or direction of blood flow in an MRI using an SE system pulse sequence.SOLUTION: A pair of gradient magnetic field pulses are applied before and after 180 degrees pulse of an SE system pulse sequence to...
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Zusammenfassung: | To suppress a flow artifact and to acquire an image without the flow artifact regardless of speed or direction of blood flow in an MRI using an SE system pulse sequence.SOLUTION: A pair of gradient magnetic field pulses are applied before and after 180 degrees pulse of an SE system pulse sequence to make intensity of the pair of gradient magnetic field pulses differ and to perform a plurality of imaging. Measurement data obtained by the plurality of imaging are Fourier transformed in an axial direction of intensity of the gradient magnetic field pulses, that is, a speed encoding direction for image reconstruction. Thus, it is possible to separate an image every stationary tissue included in tissues and speed of non-stationary component, and an image of speed zero spin, that is, an image of a stationery tissue without a flow artifact is obtained.SELECTED DRAWING: Figure 3
【課題】SE系パルスシーケンスを用いたMRIにおいて、血流の速度や向きに関わらず、フローアーチファクトを抑制しフローアーチファクトのない画像を取得する。【解決手段】SE系パルスシーケンスの180度パルスの前後に一対の傾斜磁場パルスを印加し、一対の傾斜磁場パルスの強度を異ならせて複数回の撮像を行う。複数回の撮像で得た計測データを傾斜磁場パルスの強度の軸方向すなわち速度エンコード方向にフーリエ変換して画像再構成する。これにより組織に含まれる静止組織及び静止していない成分の速度毎に画像を分離することができ、速度ゼロのスピンの画像即ちフローアーチファクトのない静止組織の画像が得られる。【選択図】図3 |
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