Abstract #2519
Consistent SNR Measures for Magnetic Resonance Elastography
Armando Manduca 1 , David S Lake 1 , Khang T Huynh 1 , Rehman S Eon 1 , Elizabeth M Annoni 1 , and Richard L Ehman 1
1
Physiology and Biomedical Engineering, Mayo
Clinic, Rochester, MN, United States
In magnetic resonance elastography, the calculated
stiffness values are affected by noise, which is
amplified by the inversion process. It would be useful
in practice to establish that, beyond some SNR
threshold, stiffness calculations are accurate within
some confidence limit. A variety of SNR measures have
been proposed for MRE, including variations of
displacement SNR and octahedral shear strain SNR. We
demonstrate here that the proper SNR measure depends on
the inversion algorithm used, and, more precisely, on
the order of derivatives in the inversion process, and
show that Laplacian-based SNR measures are required for
commonly used Helmholtz inversions.
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