Yong Pang1, Xiaoliang Zhang2,3
1Radiology and Biomedical imaging,
University of California San Francisco, San Francisco, CA , United States; 2Radiology
and Biomedical imaging, University of California San Francisco, San
Francisco, CA, United States; 3UCSF/UC Berkeley Joint Graduate
Group in Bioengineering, San Francisco & Berkeley, CA, United States
The
combination of parallel transmission and sparse pulse is able to shorten the
excitation duration by using both the coil sensitivity and sparse k-space. In
this work, a novel sparse parallel transmission design based on optimal
k-space trajectory is proposed. After undersampling the k-space, the
simulated annealing (SA) algorithm is applied to design a short k-trajectory
traveling through all the sparse samples. Almost without sampling useless
k-space data, this k-trajectory is shorter than conventional trajectories and
thus shortening the pulse width. Bloch simulation of 90O
excitation has been performed to demonstrate the feasibility of this method.
Keywords