Norris D G, Schwarzbauer C
Max-Planck-Institute of Cognitive Neuroscience, Stephanstrasse 1a, Leipzig, 04103, Germany.
J Magn Reson. 1999 Mar;137(1):231-6. doi: 10.1006/jmre.1998.1690.
The incorporation of velocity-encoding gradient pulses in RF-pulse trains is proposed and examined. Velocity selective perturbation is shown to be analogous in many respects to the well established use of trains of short RF-pulses for chemical shift selective perturbation. Velocity selective perturbation is viable in a biomedical setting only if additional RF refocusing pulses are inserted between the individual RF-pulse elements. Aspects of velocity selective excitation saturation and inversion are examined, and new inversion pulse trains proposed. The selective perturbation of both flowing and stationary spins is demonstrated in phantoms and possible biomedical applications of these pulse trains are discussed.
提出并研究了在射频脉冲序列中加入速度编码梯度脉冲的方法。结果表明，速度选择性扰动在许多方面类似于已成熟的使用短射频脉冲序列进行化学位移选择性扰动的方法。只有在各个射频脉冲元件之间插入额外的射频重聚焦脉冲时，速度选择性扰动在生物医学环境中才可行。研究了速度选择性激发饱和和反转的各个方面，并提出了新的反转脉冲序列。在模型中展示了对流动和静止自旋的选择性扰动，并讨论了这些脉冲序列可能的生物医学应用。
