Novel distance‐based slicing algorithm for ultrasonic propagation imaging

2021 ◽  
Author(s):  
Abi Rahman Syamil ◽  
Yunshil Choi ◽  
Jung‐Ryul Lee
Keyword(s):  
Ultrasonic Propagation

scholarly journals Application of an Improved Ultrasound Full-Waveform Inversion in Bone Quantitative Measurement

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 260
Author(s):  
Meng Suo ◽  
Dong Zhang ◽  
Yan Yang
Keyword(s):  
Nonlinear Equations ◽  
Waveform Inversion ◽  
Optimal Solution ◽  
Inversion Method ◽  
Full Waveform Inversion ◽  
Inversion Algorithm ◽  
Elastic Wave Equation ◽  
Full Waveform ◽  
Ultrasonic Propagation ◽  
Joint Velocity

Inspired by the large number of applications for symmetric nonlinear equations, an improved full waveform inversion algorithm is proposed in this paper in order to quantitatively measure the bone density and realize the early diagnosis of osteoporosis. The isotropic elastic wave equation is used to simulate ultrasonic propagation between bone and soft tissue, and the Gauss–Newton algorithm based on symmetric nonlinear equations is applied to solve the optimal solution in the inversion. In addition, the authors use several strategies including the frequency-grid multiscale method, the envelope inversion and the new joint velocity–density inversion to improve the result of conventional full-waveform inversion method. The effects of various inversion settings are also tested to find a balanced way of keeping good accuracy and high computational efficiency. Numerical inversion experiments showed that the improved full waveform inversion (FWI) method proposed in this paper shows superior inversion results as it can detect small velocity–density changes in bones, and the relative error of the numerical model is within 10%. This method can also avoid interference from small amounts of noise and satisfy the high precision requirements for quantitative ultrasound measurements of bone.

Ultrasonic Propagation in Open Air

1947 ◽  
Vol 19 (1) ◽  
pp. 222-234 ◽  
Author(s):  
H. K. Schilling ◽  
M. P. Givens ◽  
W. L. Nyborg ◽  
W. A. Pielemeier ◽  
H. A. Thorpe
Keyword(s):  
Ultrasonic Propagation

Long distance laser ultrasonic propagation imaging system for damage visualization

2011 ◽  
Vol 49 (12) ◽  
pp. 1361-1371 ◽  
Author(s):  
Jung-Ryul Lee ◽  
He-Jin Shin ◽  
Chen Ciang Chia ◽  
Dipesh Dhital ◽  
Dong-Jin Yoon ◽  
...  
Keyword(s):  
Imaging System ◽  
Long Distance ◽  
Laser Ultrasonic ◽  
Ultrasonic Propagation ◽  
Damage Visualization

On the Reproducibility of Transducer Coupling for Acoustic Emission Testing

2006 ◽  
Vol 13-14 ◽  
pp. 117-124 ◽  
Author(s):  
James J. Hensman ◽  
C.V. Cristodaro ◽  
Gareth Pierce ◽  
Keith Worden
Keyword(s):  
Acoustic Emission ◽  
Test Results ◽  
Coupling Condition ◽  
Waveform Data ◽  
Three Point Bending ◽  
Emission Testing ◽  
Acoustic Emission Testing ◽  
Acoustic Emission Test ◽  
Point Bend ◽  
Ultrasonic Propagation

An acoustic emission test was simulated using a three point bend specimen and an artificial AE source. Waveform data was recorded as the sample was cyclically loaded in three point bending, and the cross correlation coefficient of the waveforms was used to measure the repeatability of the test. Results were twofold: the stress state of a specimen affects the ultrasonic propagation therein; and the coupling condition of a transducer may not remain constant during a test.

scholarly journals Characterization and Analysis of the Carbonation Process of a Lime Mortar Obtained from Phosphogypsum Waste

2021 ◽  
Vol 18 (12) ◽  
pp. 6664
Author(s):  
María Isabel Romero-Hermida ◽  
Antonio María Borrero-López ◽  
Vicente Flores-Alés ◽  
Francisco Javier Alejandre ◽  
José María Franco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mineralogical Composition ◽  
Barium Sulphate ◽  
Negative Influence ◽  
Raw Material ◽  
Porous System ◽  
Waste Products ◽  
Liesegang Rings ◽  
Carbonation Process ◽  
Ultrasonic Propagation

This work addresses the reuse of waste products as a raw material for lime putties, which are one of the components of mortar. 1:3 Lime/sand mortars very similar to conventional construction mortars were prepared using a lime putty obtained from the treatment of phosphogypsum with sodium hydroxide. The physical, rheological and mechanical properties of this phosphogypsum-derived mortar have been studied, as well as the mineralogical composition, microstructure by scanning electron microscope (SEM) and curing process by monitoring carbonation and ultrasonic propagation velocity. Considering the negative influence of sulphates on the hardened material, the behaviour of the material after sulphates precipitation by adding barium sulphate was additionally tested. Carbonation progressed from the outside to the inside of the specimen through the porous system by Liesegang rings patterns for mortars with soluble sulphates, while the carbonation with precipitated sulphates was controlled by diffusion-precipitation. Overall, the negative influence of low-sulphate contents on the mechanical properties of mortars was verified. It must be highlighted the importance of their precipitation to obtain adequate performance.

Transport properties and ultrasonic propagation in single crystal Gd65.4-Y34.6

1982 ◽  
Vol 28 (1-2) ◽  
pp. 175-187 ◽  
Author(s):  
J.B. Sousa ◽  
R.P. Pinto ◽  
M.F. Pinheiro ◽  
M.E. Braga ◽  
J.M. Moreira ◽  
...  
Keyword(s):  
Single Crystal ◽  
Transport Properties ◽  
Ultrasonic Propagation
Sign in / Sign up

Export Citation Format

Share Document