Harmonic wideband simultaneous dual‐frequency MR Elastography
نویسندگان
چکیده
منابع مشابه
Fractional encoding of harmonic motions in MR elastography.
In MR elastography (MRE) shear waves are magnetically encoded by bipolar gradients that usually oscillate with the same frequency fv 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/fv. This causes long acquisition times and considerable signal dephasing in tissue with short transverse rela...
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Introduction: Magnetic resonance elastography (MRE) allows the measurement of the mechanical properties of living tissue by combining shear waves and motion sensitive MRI [1]. In classical MRE, shear wave images are evaluated using an appropriate wave inversion technique for calculating an estimate of the spatial distribution of the shear modulus within the region of interest [2]. Problem: Wave...
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PURPOSE To demonstrate the feasibility of in vivo wideband MR elastography (wMRE) using continuous, time-harmonic shear vibrations in the frequency range of 10-50 Hz. THEORY AND METHODS The method was tested in a gel phantom with marked mechanical loss. The brains and livers of eight volunteers were scanned by wMRE using multislice, single-shot MRE with optimized fractional encoding and synch...
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Background: MRE is a phase contrast MRI technique that evaluates the stiffness of tissues by directly visualizing and measuring propagated mechanical shear waves in tissues. MRE generates quantitative measurements and colorized spatial maps of shear wave displacement. The initial wave images are processed to generate an elastogram, which displays the quantitative values of the shear modulus of ...
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ژورنال
عنوان ژورنال: NMR in Biomedicine
سال: 2020
ISSN: 0952-3480,1099-1492
DOI: 10.1002/nbm.4442