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- Title
Fractional encoding of harmonic motions in MR elastography.
- Authors
Rump, Jens; Klatt, Dieter; Braun, Jürgen; Warmuth, Carsten; Sack, Ingolf
- Abstract
In MR elastography (MRE) shear waves are magnetically encoded by bipolar gradients that usually oscillate with the same frequency f v as the mechanical vibration. As a result, both the repetition time (TR) and echo time (TE) of such an MRE sequence are greater than the vibration period 1/ f v. This causes long acquisition times and considerable signal dephasing in tissue with short transverse relaxation times. Here we propose a reverse concept with TR ≤ 1/ f v which we call 'fractional' MRE, i.e., only a fraction of one vibration cycle per TR, can be used for motion sensitization. The benefit of fractional MRE is twofold: 1) acquisition times in seconds can be achieved for a single-phase difference wave image, and 2) materials that combine low elasticity, high viscosity, and short T
- Publication
Magnetic Resonance in Medicine, 2007, Vol 57, Issue 2, p388
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.21152