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Sparse parallel transmission on randomly perturbed spiral k-space trajectory

	author = {Yong Pang and Xiaohua Jiang and Xiaoliang Zhang},
	title = {Sparse parallel transmission on randomly perturbed spiral k-space trajectory},
	journal = {Quantitative Imaging in Medicine and Surgery},
	volume = {4},
	number = {2},
	year = {2014},
	keywords = {},
	abstract = {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° 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.},
	issn = {2223-4306},	url = {}