Evaluation of a material parameter extraction algorithm using MRI-based displacement measurements

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 47; no. 6; pp. 1575 - 1581
• Main Authors: Romano, A.J., Bucaro, J.A., Ehnan, R.L., Shirron, J.J.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2000; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acoustical measurements and instrumentation; Acoustics; Algorithms; Biological and medical sciences; Data mining; Displacement; Displacement measurement; Exact sciences and technology; Excitation; Filtering; Filtration; Fundamental areas of phenomenology (including applications); Imaging phantoms; Inversions; Investigative techniques, diagnostic techniques (general aspects); Magnetic resonance imaging; Magnetic separation; Materials testing; Medical sciences; Miscellaneous. Technology; Parameter extraction; Physics; Radiodiagnosis. Nmr imagery. Nmr spectrometry; Shear; Time measurement; Ultrasonics, quantum acoustics, and physical effects of sound; Velocity measurement; X-ray imaging; Performance evaluation; Parameter estimation; Filtering; Propagation velocity; Longitudinal wave; Elastic wave; Monochromatic radiation; Experimental study; Nuclear magnetic resonance imaging; Heterogeneous wave; Algorithm performance; Displacement measurement; Properties of materials; S wave; Measurement method; Wave velocity; Wave number
• ISSN: 0885-3010; 1525-8955
• DOI: 10.1109/58.883546

The performance of an inversion algorithm is investigated when applied to measured displacement data for a determination of the material parameters /sup /spl lambda/+2/spl mu///sub /spl rho// (longitudinal wave velocity squared) and /sup /spl mu///sub /spl rho// (shear wave velocity squared) throughout an inhomogeneous test phantom. The vector displacement components throughout a test phantom subject to monochromatic shear excitation measured in time using magnetic resonance imaging (MRI) were temporally Fourier transformed to extract the component of monochromatic excitation, and the data was delivered to the inversion algorithm. A series of inversions is presented demonstrating the effects of subsequent wavenumber filtering, polarization selection, and variation in the size of the incremental volume elements. The resulting performance is assessed, and recommendations for future efforts are discussed.