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Published on: February 15, 2014
Multiple-frequency excitation wideband MRI (ME-WMRI)
Edzer L Wu1, Tzi-Dar Chiueh2, Jyh-Horng Chen3
1Institute of Biomedical Engineering, National Taiwan University, Taipei 106, Taiwan and MRI/MRS Interdisciplinary Lab, National Taiwan University, Taipei 106, Taiwan.
Purpose:
In this study multiple-frequency excitation wideband MRI (ME-WMRI), a technique designed to acquire simultaneously excited images without blurring was proposed.
Methods:
ME-WMRI consists of (a) a coherent acquisition sequence that applies refocusing gradient during readout to mitigate signal dephasing, and (b) a signal enhancement procedure that further reduces image blurring. This two-step method was tested on phantom imaging andin vivo imaging with up to 3.84 pixel blur.
Results:
Imaging results in both phantom andin vivo show that the lost details were successfully restored in the blur-mitigated images, and the accelerated images were comparable to standard images.
Conclusions:
The proposed ME-WMRI method can effectively undo the image blurring, and thus removes the limitation on fast simultaneous multislice MRI systems with a large acceleration factor.
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