Sparse parallel transmission on randomly perturbed spiral k-space trajectory
Sparse parallel transmission on randomly perturbed spiral k-space trajectory
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DOI：
10.3978/j.issn.2223-4292.2014.04.12
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发表时间：
2014-04-01
影响因子：
2.8
通讯作者：
Zhang, Xiaoliang
中科院分区：
文献类型：
--
作者：
Pang, Yong;Jiang, Xiaohua;Zhang, Xiaoliang
Combination of parallel transmission and sparse pulse is able to shorten the excitation by using both the coil sensitivity and sparse k-space, showing improved fast excitation capability over the use of parallel transmission alone. However, to design an optimal k-space trajectory for sparse parallel transmission is a challenging task. In this work, a randomly perturbed sparse k-space trajectory is designed by modifying the path of a spiral trajectory along the sparse k-space data, and the sparse parallel transmission RF pulses are subsequently designed based on this optimal trajectory. This method combines the parallel transmission and sparse spiral k-space trajectory, potentially to further reduce the RF transmission time. Bloch simulation of 90 degrees excitation by using a four channel coil array is performed to demonstrate its feasibility. Excitation performance of the sparse parallel transmission technique at different reduction factors of 1, 2, and 4 is evaluated. For comparison, parallel excitation using regular spiral trajectory is performed. The passband errors of the excitation profiles of each transmission are calculated for quantitative assessment of the proposed excitation method.
