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For ring-array ultrasound tomography, two-dimensional frequency-domain full waveform inversion is the clinical gold standard for high-resolution imaging of the breast. While yielding high-resolution images in the plane of the ring-array, the resulting slice-wise approach yields lower resolution out of plane when used to reconstruct the full volume. Instead, this work proposes a fully three-dimensional full-waveform inversion based on a multi-row ring-array transducer to improve out-of-plane resolution, while using cylindrical-wave transmissions to minimize acquisition and reconstruction time. For each numerical breast phantom tested, the root-mean-square error of three-dimensional full-waveform inversion is less than that of two-dimensional slice-wise full-waveform inversion by 6.3-13.7 m/s.
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http://dx.doi.org/10.1109/ojuffc.2025.3570253 | DOI Listing |
IEEE Open J Ultrason Ferroelectr Freq Control
May 2025
Department of Imaging Sciences, University of Rochester Medical Center, Rochester, NY 14642 USA.
For ring-array ultrasound tomography, two-dimensional frequency-domain full waveform inversion is the clinical gold standard for high-resolution imaging of the breast. While yielding high-resolution images in the plane of the ring-array, the resulting slice-wise approach yields lower resolution out of plane when used to reconstruct the full volume. Instead, this work proposes a fully three-dimensional full-waveform inversion based on a multi-row ring-array transducer to improve out-of-plane resolution, while using cylindrical-wave transmissions to minimize acquisition and reconstruction time.
View Article and Find Full Text PDFJ Acoust Soc Am
July 2025
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.
In acoustic logging, the dipole-mode wave is a type of guided wave that propagates along the borehole, and its dispersion characteristics are typically used to invert the shear-wave velocity of the formation around the borehole. However, traditional dispersion-based inversions rely on the layered model assumption, limiting their applicability to formations that are either uniformly distributed along the borehole axis or exhibit gradual variations. As a method that directly fits observed waveforms, full waveform inversion (FWI) can be applied to various formation models without being constrained by the assumption of two-dimensional homogeneity.
View Article and Find Full Text PDFData Brief
August 2025
Gustave Eiffel University, GeoEND - Nantes, F-44344 Bouguenais, France.
The visible surface degradation of pavements is often the result of underlying subsurface defects. The quality of the bond between the wearing course and the binder course is a key factor in limiting issues such as delamination, stripping, etc. The use of non-destructive testing (NDT) methods, such as electromagnetic wave propagation combined with a hybrid data processing approach-machine learning and Full-Waveform Inversion-has recently demonstrated its effectiveness [1].
View Article and Find Full Text PDFExp Fluids
July 2025
Department of Earth and Planetary Sciences, ETH Zürich, Sonneggstrasse 5, 8090 Zurich, Switzerland.
Abstract: Using the travel time of sound waves advected by a moving carrier medium, acoustic tomography allows to reconstruct temperature and flow fields in opaque fluids without tracers or scattering particles. Reconstruction algorithms are conventionally based on the ray approximation and pose difficulties, especially in enclosed domains: Interferences of early reflections can prevent the assignment of each arrival to the correct ray path. We develop a full-waveform inversion for acoustic tomography in laboratory-scale experiments, perform synthetic tests, and benchmark these with a straight-ray algorithm.
View Article and Find Full Text PDFUltrasonics
November 2025
Technical University of Munich, TUM School of Engineering and Design, Department of Materials Engineering, Chair of Non-destructive Testing, Franz-Langinger-Str. 10, Munich, 81245, Germany.
Phased array ultrasound is a widely used technique in non-destructive testing. Using piezoelectric elements as both sources and receivers provides a significant gain in information and enables more accurate defect detection. The process is called full matrix capture when all source-receiver combinations are used.
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