MR Elastography (MRE) with MultiBand and/or SIR
Publication Date: 2014-Apr-25
The IP.com Prior Art Database
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MultiBand and/or SIR
MR Elastography (MRE) with
MRE sequences normally use Gradient Echo readouts (FFE) for phase synchronized to an externally imposed, pseudo
Alternatively, SE EPI sequences can be used for MRE.
The number of slices measured in MRE is limited by the fact that 4 different delays are required of the motion encoding gradient relative to the externally applied wave. A single breath hold of about 1 needed per slice, and more than 4 slices is not really feasible for patients.
It would be advantageous to reduce the number of breath holds, and/or increase the number of slices.
MRE sequences normally use Gradient Echo readouts (FFE) for phase-sensitive motion encoding,
-continuous, shear wave in the human body
motion encoding gradient relative to the externally applied wave. A single breath hold of about 15 sec is
FFE and SE-EPI with motion encoding gradients, triggered
MultiBand excitation is applied for FFE and SE EPI (esp. diffusion), applying phase modulated RF
excitation pulses to simultaneously excite multiple slices. Phase cycling can be applied to shift the FOV per slice for improved parallel imaging unfolding. In addition,
through-plane dephasing in relation to the required gradient
Magnetom World 2012:
to the external wave imparting device for MRE
blipped gradients can be applied to reduce
area for a FOV shift per slice.
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As alternative method, simultaneous image refocusing (SIR) can be applied to excite and acquire multiple slices...