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MR Elastography (MRE) with MultiBand and/or SIR

IP.com Disclosure Number: IPCOM000236439D
Publication Date: 2014-Apr-25
Document File: 2 page(s) / 210K

Publishing Venue

The IP.com Prior Art Database

Abstract

2014ID00438

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Page 01 of 2

MultiBand and/or SIR

MR Elastography (MRE) with

Problem description

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

Prior art:

FFE and SE-EPI with motion encoding gradients, triggered

acquisitions.

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.

From Siemens


Page 02 of 2

As alternative method, simultaneous image refocusing (SIR) can be applied to excite and acquire multiple slices...