Ultrasound monitoring of simultaneous High-Intensity focused ultrasound (HIFU) therapy using Minimum-Peak-Sidelobe coded excitation
In this study, a novel single-transmit bipolar sequence with minimum-peak-sidelobe (MPS) level is developed not only to restore the image quality of US monitoring but also remove acoustic interference from simultaneous HIFU transmission. The proposed MPS code is designed with an equal number of positive and negative bits and the bit duration should be an integer multiple of the period of the HIFU waveform. In addition, different permutations of code sequence are searched in order to obtain the optimal encoding. The received imaging echo is firstly decoded by matched filtering to cancel HIFU interference and to enhance the ...
Source: Ultrasonics - December 22, 2023 Category: Physics Authors: Che-Chou Shen Nien-Hung Wu Source Type: research
Comment on "So you think you can DAS? A viewpoint on delay-and-sum beamforming" [Ultrasonics 111 (2021) 106309]
Ultrasonics. 2023 Dec 18;138:107221. doi: 10.1016/j.ultras.2023.107221. Online ahead of print.ABSTRACTIt is shown herein that Perrot et al., who reviewed delay-and-sum beamforming for ultrafast ultrasound imaging in [Ultrasonics 111 (2021) 106309], misinterpreted the purpose of dynamic receive apertures. Such apertures widen with the focal length as a function of a given f-number and improve the image quality by suppressing grating lobes. Perrot et al., however, attributed erroneously the image quality improvement to suppression of measurement noise and, in doing so, proposed a suboptimal method to determine an f-number.PM...
Source: Ultrasonics - December 22, 2023 Category: Physics Authors: Martin F Schiffner Georg Schmitz Source Type: research
Ultrasound monitoring of simultaneous High-Intensity focused ultrasound (HIFU) therapy using Minimum-Peak-Sidelobe coded excitation
In this study, a novel single-transmit bipolar sequence with minimum-peak-sidelobe (MPS) level is developed not only to restore the image quality of US monitoring but also remove acoustic interference from simultaneous HIFU transmission. The proposed MPS code is designed with an equal number of positive and negative bits and the bit duration should be an integer multiple of the period of the HIFU waveform. In addition, different permutations of code sequence are searched in order to obtain the optimal encoding. The received imaging echo is firstly decoded by matched filtering to cancel HIFU interference and to enhance the ...
Source: Ultrasonics - December 22, 2023 Category: Physics Authors: Che-Chou Shen Nien-Hung Wu Source Type: research
Improved assessment sensitivity of time-varying cavitation events based on wavelet analysis
This study introduces a novel perspective for more sensitive and precise cavitation assessment, leveraging time and frequency data from wavelet analysis, and holds promise for effective utilization of cavitation effects while minimizing losses and damages resulting from unintended cavitation events.PMID:38118237 | DOI:10.1016/j.ultras.2023.107227 (Source: Ultrasonics)
Source: Ultrasonics - December 20, 2023 Category: Physics Authors: Qi Zhang Guofeng Zhang Lan Luo Zijun Liu Yifei Zhu Zheng Fan Xiasheng Guo Xiaoge Wu Dong Zhang Juan Tu Source Type: research
Graphene-based phononic crystal lenses: Machine learning-assisted analysis and design
Ultrasonics. 2023 Dec 12;138:107220. doi: 10.1016/j.ultras.2023.107220. Online ahead of print.ABSTRACTThe advance of artificial intelligence and graphene-based composites brings new vitality into the conventional design of acoustic lenses which suffers from high computation cost and difficulties in achieving precise desired refractive indices. This paper presents an efficient and accurate design methodology for graphene-based gradient-index phononic crystal (GGPC) lenses by combing theoretical formulations and machine learning methods. The GGPC lenses consist of two-dimensional phononic crystals possessing square unit cell...
Source: Ultrasonics - December 20, 2023 Category: Physics Authors: Liangteng Guo Shaoyu Zhao Jie Yang Sritawat Kitipornchai Source Type: research
Improved assessment sensitivity of time-varying cavitation events based on wavelet analysis
This study introduces a novel perspective for more sensitive and precise cavitation assessment, leveraging time and frequency data from wavelet analysis, and holds promise for effective utilization of cavitation effects while minimizing losses and damages resulting from unintended cavitation events.PMID:38118237 | DOI:10.1016/j.ultras.2023.107227 (Source: Ultrasonics)
Source: Ultrasonics - December 20, 2023 Category: Physics Authors: Qi Zhang Guofeng Zhang Lan Luo Zijun Liu Yifei Zhu Zheng Fan Xiasheng Guo Xiaoge Wu Dong Zhang Juan Tu Source Type: research
Graphene-based phononic crystal lenses: Machine learning-assisted analysis and design
Ultrasonics. 2023 Dec 12;138:107220. doi: 10.1016/j.ultras.2023.107220. Online ahead of print.ABSTRACTThe advance of artificial intelligence and graphene-based composites brings new vitality into the conventional design of acoustic lenses which suffers from high computation cost and difficulties in achieving precise desired refractive indices. This paper presents an efficient and accurate design methodology for graphene-based gradient-index phononic crystal (GGPC) lenses by combing theoretical formulations and machine learning methods. The GGPC lenses consist of two-dimensional phononic crystals possessing square unit cell...
Source: Ultrasonics - December 20, 2023 Category: Physics Authors: Liangteng Guo Shaoyu Zhao Jie Yang Sritawat Kitipornchai Source Type: research
Improved assessment sensitivity of time-varying cavitation events based on wavelet analysis
This study introduces a novel perspective for more sensitive and precise cavitation assessment, leveraging time and frequency data from wavelet analysis, and holds promise for effective utilization of cavitation effects while minimizing losses and damages resulting from unintended cavitation events.PMID:38118237 | DOI:10.1016/j.ultras.2023.107227 (Source: Ultrasonics)
Source: Ultrasonics - December 20, 2023 Category: Physics Authors: Qi Zhang Guofeng Zhang Lan Luo Zijun Liu Yifei Zhu Zheng Fan Xiasheng Guo Xiaoge Wu Dong Zhang Juan Tu Source Type: research
Graphene-based phononic crystal lenses: Machine learning-assisted analysis and design
Ultrasonics. 2023 Dec 12;138:107220. doi: 10.1016/j.ultras.2023.107220. Online ahead of print.ABSTRACTThe advance of artificial intelligence and graphene-based composites brings new vitality into the conventional design of acoustic lenses which suffers from high computation cost and difficulties in achieving precise desired refractive indices. This paper presents an efficient and accurate design methodology for graphene-based gradient-index phononic crystal (GGPC) lenses by combing theoretical formulations and machine learning methods. The GGPC lenses consist of two-dimensional phononic crystals possessing square unit cell...
Source: Ultrasonics - December 20, 2023 Category: Physics Authors: Liangteng Guo Shaoyu Zhao Jie Yang Sritawat Kitipornchai Source Type: research
"Cumulative effect" of second harmonic Lamb waves in a lossy plate
Ultrasonics. 2023 Dec 16;138:107229. doi: 10.1016/j.ultras.2023.107229. Online ahead of print.ABSTRACTThe second harmonic Lamb waves have high sensitivity to microstructural defects in materials and are therefore promising for incipient damage detection and monitoring of thin-walled structures. Existing studies have shown that the second harmonic Lamb waves can be cumulative with increasing propagation distance under the internal resonance conditions, which is conducive to nonlinear wave measurements in view of structural health monitoring. However, when propagating in a lossy structure with damping, the cumulative propert...
Source: Ultrasonics - December 19, 2023 Category: Physics Authors: Shengbo Shan Yuanman Zhang Liaoliao Cheng Yang Song Yongdong Pan Li Cheng Source Type: research
Mechanisms of elastic wave generation by EMAT in ferromagnetic media
Ultrasonics. 2023 Dec 14;138:107218. doi: 10.1016/j.ultras.2023.107218. Online ahead of print.ABSTRACTThe present paper deals with the problem of elastic wave generation mechanisms (WGMs) by an electromagnetic-acoustic transducer (EMAT) in ferromagnetic materials. The paper seeks to prove that taking into account all the WGMs must be a general rule to quantitatively predict the elastic waves generated by an EMAT in such materials. Existing models of the various physical phenomena involved, namely magnetic and magnetostrictive, electromagnetic, and ultrasonic, are combined to solve the multiphysics wave generation problem. ...
Source: Ultrasonics - December 18, 2023 Category: Physics Authors: Abdellahi Abderahmane Bastien Clausse Alain Lh émery Laurent Daniel Source Type: research
Mechanisms of elastic wave generation by EMAT in ferromagnetic media
Ultrasonics. 2023 Dec 14;138:107218. doi: 10.1016/j.ultras.2023.107218. Online ahead of print.ABSTRACTThe present paper deals with the problem of elastic wave generation mechanisms (WGMs) by an electromagnetic-acoustic transducer (EMAT) in ferromagnetic materials. The paper seeks to prove that taking into account all the WGMs must be a general rule to quantitatively predict the elastic waves generated by an EMAT in such materials. Existing models of the various physical phenomena involved, namely magnetic and magnetostrictive, electromagnetic, and ultrasonic, are combined to solve the multiphysics wave generation problem. ...
Source: Ultrasonics - December 18, 2023 Category: Physics Authors: Abdellahi Abderahmane Bastien Clausse Alain Lh émery Laurent Daniel Source Type: research
Deformation mechanisms and Surface/Interface characteristics of titanium-based thermoplastic FMLs under ultrasonic impact loading
Ultrasonics. 2023 Dec 8;138:107217. doi: 10.1016/j.ultras.2023.107217. Online ahead of print.ABSTRACTSome typical defects like delamination, fiber fracture, non-uniform resin distribution and springback are inevitable as titanium-based thermoplastic FMLs are formed by general stamping process at elevated temperature due to the significant differences of various constituent materials in mechanical and thermal properties as well as deformation mechanism. Thus, a novel ultrasonic impact sizing/shaping process method was proposed in the present work, in which a stepped horn and impact tools with a cylindrical tip end was desig...
Source: Ultrasonics - December 17, 2023 Category: Physics Authors: Yuqin Guo Xingming Xu Zhanfu Chen Hang Yin Fuzhu Li Source Type: research
Augmentation of tumour perfusion by ultrasound and microbubbles: A preclinical study
CONCLUSIONS: The best sononeoperfusion effect was obtained with an MI of 0.3 and an ultrasound exposure time of 450 s. The effect is most likely related to NO and ATP increases. The sononeoperfusion effect might be a novel way to ameliorate tumour hypoperfusion and hypoxia.PMID:38104380 | DOI:10.1016/j.ultras.2023.107219 (Source: Ultrasonics)
Source: Ultrasonics - December 17, 2023 Category: Physics Authors: Jing Zhang Yi Zhang Zhiping Cai Junshuai Wei Hui Li Peijing Li Xiaoxiao Dong Zheng Liu Source Type: research
Deformation mechanisms and Surface/Interface characteristics of titanium-based thermoplastic FMLs under ultrasonic impact loading
Ultrasonics. 2023 Dec 8;138:107217. doi: 10.1016/j.ultras.2023.107217. Online ahead of print.ABSTRACTSome typical defects like delamination, fiber fracture, non-uniform resin distribution and springback are inevitable as titanium-based thermoplastic FMLs are formed by general stamping process at elevated temperature due to the significant differences of various constituent materials in mechanical and thermal properties as well as deformation mechanism. Thus, a novel ultrasonic impact sizing/shaping process method was proposed in the present work, in which a stepped horn and impact tools with a cylindrical tip end was desig...
Source: Ultrasonics - December 17, 2023 Category: Physics Authors: Yuqin Guo Xingming Xu Zhanfu Chen Hang Yin Fuzhu Li Source Type: research
