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

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) through...

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Veröffentlicht in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control Jg. 47; H. 6; S. 1575 - 1581
Hauptverfasser: Romano, A.J., Bucaro, J.A., Ehnan, R.L., Shirron, J.J.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York, NY IEEE 01.11.2000
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
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
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Zusammenfassung: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.
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ISSN:0885-3010
1525-8955
DOI:10.1109/58.883546