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Determination of a magnetic resonance - sequence with concentric, circular transmit trajectories
Determination of a magnetic resonance - sequence with concentric, circular transmit trajectories
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机译:确定具有同心圆传输轨迹的磁共振序列
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摘要
It is a method for determination of a magnetic resonance - sequence (as) is described, with a pulse arrangement (pa, pa '', pa "), which, in at least two spatial directions (x, y) acts selectively a rotationally symmetrical excitation profile (ep) within an object to be examined (o), in order to excite. In this case comprises a hf - excitation pulse (sharpness, sharpness '', sharpness ") of the pulse arrangement (pa, pa'', pa ") a sequence of a plurality of hf - component pulses (rf1, Rf2, Rf3, .., Rfn, .., Rf8) and parallel to the sequence of hf - component pulses (rf1, Rf2, Rf3, .., Rfn, .., Rf8) are so coordinated gradient pulses (gpx, Gpy, Gpx'', Gpy'', Gpx'''', Gpy'''') in the two spatial directions (x, y) that the hf - energy introduction of different hf - partial pulses (rf1, Rf2, Rf3, .., Rfn, .., Rf8) in the transmitter - k - space (sk) in each case on mutually concentric, circular k - space - transmit trajectories (tr1, Tr2, Tr3, .., Tr8) takes place. In this case, the amplitude (b1) the envelope of the hf - partial pulses (rf1, Rf2, Rf3, .., Rfn, .., Rf8) in each case during the duration (t, t1, T2, T3, .., Tn, .., T8) a passage of a circular k - space - trajectory (tr1, Tr2, Tr3, .., Tr8) constant. In addition, a method for operating and a method for calibrating a magnet resonance system (1), a control sequence determination of a direction (22) for determining a magnetic resonance - sequence (as) as well as a magnet resonance system (1) with such a control sequence determination of a direction (22) is described.
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机译:这是一种确定磁共振的方法-描述了具有脉冲排列(pa,pa'',pa“)的序列(as),该脉冲排列在至少两个空间方向(x,y)上有选择地作用于旋转为了激发,在待检查对象(o)内的对称激励轮廓(ep)在这种情况下包括hf-脉冲布置(pa,pa'')的激励脉冲(锐度,锐度“,锐度”) ,pa“)多个hf分量脉冲(rf 1 Sub>,Rf 2 Sub>,Rf 3 Sub>,..,Rf < Sub> n Sub>,..,Rf 8 Sub>)并平行于hf-分量脉冲序列(rf 1 Sub>,Rf 2 Sub >,Rf 3 Sub>,..,Rf n Sub>,..,Rf 8 Sub>)是协调梯度脉冲(gp x < / Sub>,Gp y Sub>,Gp x Sub>'',Gp y Sub>'',Gp x Sub>''' ',Gp y Sub>'''')在两个空间方向(x,y)上,即hf-不同hf的能量引入-部分脉冲(rf 1 Sub>,Rf 2 Sub>,Rf <发射机中的Sub> 3 Sub>,..,Rf n Sub>,..,Rf 8 Sub>)-k-空间(s k Sub >)分别在相互同心的圆形k空间上的传输轨迹(tr 1 Sub>,Tr 2 Sub>,Tr 3 Sub>,.., Tr 8 Sub>)发生。在这种情况下,幅度(b 1 Sub>)的高频包络线-部分脉冲(rf 1 Sub>,Rf 2 Sub>,Rf 3 Sub>,..,Rf n Sub>,..,Rf 8 Sub>)在持续时间内(t,t 1 Sub> ,T 2 Sub>,T 3 Sub>,..,T n Sub>,..,T 8 Sub>)圆形k空间轨迹(tr 1 Sub>,Tr 2 Sub>,Tr 3 Sub>,..,Tr 8 Sub> ) 不变。此外,还涉及一种用于运行和校准磁共振系统的方法(1),用于确定磁共振的方向(22)的控制顺序确定以及磁共振系统(1)。描述具有这样的控制序列的方向(22)的确定。
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