COMPENSATION OF MULTIDIMENSIONAL SELECTIVE EXCITATION PULSES USING MEASURED K-SPACE TRAJECTORIES
COMPENSATION OF MULTIDIMENSIONAL SELECTIVE EXCITATION PULSES USING MEASURED K-SPACE TRAJECTORIES
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DOI：
10.1002/mrm.1910340323
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发表时间：
1995-09-01
影响因子：
3.3
通讯作者：
PETERS, T
中科院分区：
文献类型：
--
作者：
TAKAHASHI, A;PETERS, T
多维空间选择性激励脉冲依赖于梯度波形的准确性来实现期望的激励体积。不幸的是，这些脉冲所需的高梯度转换速率和幅度常常导致成像系统产生的波形失真，从而导致不良的选择轮廓。在本文中，用于确定由扫描仪的场梯度产生的实际轨迹的k空间校准过程，该测量的信息然后被并入选择性激励设计技术中，用于校正RF脉冲包络以补偿激励体积的梯度波形诱导的失真。
Multidimensional spatially selective excitation pulses rely on the accuracy of gradient waveforms to achieve desired excitation volumes, Unfortunately, the high gradient slew-rates and magnitudes required by these pulses often lead to distortion of the waveforms produced by imaging systems resulting in poor selection profiles, In this paper, a k-space calibration procedure, used to determine the actual trajectory produced by the scanner's field gradients, is extended to two spatial dimensions, This measured information is then incorporated in a selective excitation design technique for correcting the RF pulse envelopes to compensate for gradient waveform induced distortion of the excitation volumes.