2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS)最新文献

Adaptive Realization Based on One Transmission and Reception of Simultaneous Subband Compound of Harmonics 基于同时子带复合谐波一发一收的自适应实现

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639150

Jie Zheng, N. Tagawa, M. Yoshizawa, T. Irie

引用次数: 1

Rotation Elastogram Estimation Using Mechanical Assisted Spatial Compounding: A simulation study 基于机械辅助空间复合的旋转弹性图估计:仿真研究

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639198

Belfor Galáz, Teresa Henriquez, David Espíndola, M. Trejo

{"title":"Rotation Elastogram Estimation Using Mechanical Assisted Spatial Compounding: A simulation study","authors":"Belfor Galáz, Teresa Henriquez, David Espíndola, M. Trejo","doi":"10.1109/LAUS53676.2021.9639198","DOIUrl":"https://doi.org/10.1109/LAUS53676.2021.9639198","url":null,"abstract":"In quasi-static ultrasound elastography the breast tumor classification may be done by using the rotation fill-in signature presents in the rotation elastogram, which is a marker of benignity that originate from the lesion rotation as a product of a laterally asymmetric stress field. However, the well-known low lateral resolution limitation of ultrasound imaging reduces the image quality of rotation elastogram. Studies using beam-steering, synthetic transmit aperture (STA) and diverging beam with STA methods have shown that the rotation elastogram quality can be significantly improved. In this context, we aim to study the feasibility of improve the rotation elastogram by mechanical assisted spatial compounding of displacements images from different ultrasound probe angles. We present a numerical study of the rotation elastogram contrast-to-noise enhancement by spatial compounding of displacement images obtained from quasi-static small compression at different ultrasound probe angles. Instead of steer electronically the insonofication beam, the ultrasound probe is rotated itself. Our results show that the contrast-to-noise ratio of the rotation elastogram can be significantly improved by increasing the number of displacement images used in the spatial compounding for small scanning angles.","PeriodicalId":156639,"journal":{"name":"2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133331632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Copyright notice] (版权)

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/laus53676.2021.9639155

引用次数: 0

Numerical investigation of the propagation characteristics of shear horizontal guided wave modes in coated pipes 剪切水平导波模式在包覆管道中传播特性的数值研究

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639157

Christiano M. Nascimento, Lucas M. Martinho, A. Kubrusly

{"title":"Numerical investigation of the propagation characteristics of shear horizontal guided wave modes in coated pipes","authors":"Christiano M. Nascimento, Lucas M. Martinho, A. Kubrusly","doi":"10.1109/LAUS53676.2021.9639157","DOIUrl":"https://doi.org/10.1109/LAUS53676.2021.9639157","url":null,"abstract":"Shear horizontal (SH) guided waves are commonly used for non-destructive evaluation of plates and pipes. A coating layer is often applied to the outer surface of steel pipes to prevent external corrosion. Even with a considerably lower acoustic impedance, relative to steel, the presence of this layer can significantly alter the propagation characteristics of SH guided wave mode. Due to its viscoelastic properties, guided wave modes that propagate fairly in an equivalent bare pipe may become an unsuitable choice in a coated pipe. In this paper, we investigate which SH modes are more adequate for a circumferential inspection of a coated pipe of interest. The case study consists of a 323 mm outer diameter, 6.35 mm thick steel pipe coated with a 1.5 mm polyethylene layer, in which SH waves are generated either at the low- and high-frequency-thickness regime. A semi-analytical model was used to calculate the dispersion and attenuation curves and a finite element numerical model was further exploited to investigate the propagating modes. Results show that, in the analyzed case, at the high-frequency-thickness regime, the quasi-SH0 mode at 10 mm wavelength and the quasi-SH1 mode at 20 mm wavelength presented low attenuation of about 4 dB/m and 14 dB/m. However, at the low-frequency-thickness regime, the quasi-SHO mode at 20 mm wavelength presented a high attenuation, hindering and reflected echo from a defect to be detected, since it lies at a crossing point between the dispersion curves of a guided wave mode whose profile is mostly in the metal layer with a guided wave mode whose profile is concentrated in the coating layer. Therefore, operating at the usual low-thickness-frequency regime was completed prevented, making one move the higher-frequency-regime. A careful selection of the most suitable operating mode is paramount in order to inspect a defect with ultrasonic guided waves in pipes with coating.","PeriodicalId":156639,"journal":{"name":"2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130723815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Classification Functions and Optimization Algorithms for Debonding Detection in Adhesively Bonded Lap-joints through Ultrasonic Guided Waves 超声导波黏合搭接接头脱粘检测的分类函数及优化算法

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639183

M. Barzegar, D. Pasadas, A. Ribeiro, H. Ramos

引用次数: 0

A Performance Evaluation of Class-B Amplifiers for Driving Piezoelectric Transducers 驱动压电换能器的b类放大器性能评价

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639097

F. Ramos, F. Arnold

引用次数: 0

Significance of Non-Thermal Effects in LIPUS Induced Drug Release from Gold Nanoparticle Drug Carriers LIPUS诱导药物从金纳米颗粒药物载体释放的非热效应的意义

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639215

Tyler K Hornsby, A. Jakhmola, Michael C. Kolios, J. Tavakkoli

{"title":"Significance of Non-Thermal Effects in LIPUS Induced Drug Release from Gold Nanoparticle Drug Carriers","authors":"Tyler K Hornsby, A. Jakhmola, Michael C. Kolios, J. Tavakkoli","doi":"10.1109/LAUS53676.2021.9639215","DOIUrl":"https://doi.org/10.1109/LAUS53676.2021.9639215","url":null,"abstract":"In this work a low intensity pulsed ultrasound (LIPUS) targeted drug delivery system was used to induce the release of curcumin, as a natural drug, from the surface of gold nanoparticle (GNP) drug carriers in an ex vivo tissue model. It is hypothesized that a combination of thermal and non-thermal mechanisms are responsible for the curcumin release. To test these mechanisms, drug release was induced with: (1) heating with a hot water needle (thermal mechanism only), and (2) low intensity pulsed ultrasound (LIPUS) exposure (combined thermal and non-thermal mechanisms). When comparing curcumin release between the two treatments there was an 85% increase in curcumin release when using LIPUS over hot water heating. In treatment 1 a water temperature was selected which yielded a similar temperature profile in the region of interest containing the GNP dug carriers as that seen with LIPUS exposure. This suggests that non-thermal effects present in LIPUS exposure, such as acoustic radiation force and acoustic streaming, are significant in LIPUS targeted drug release from GNP drug carriers.","PeriodicalId":156639,"journal":{"name":"2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114655946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Identification of advanced hepatic steatosis and fibrosis using ML algorithms on high-frequency ultrasound data in patients with non-alcoholic fatty liver disease 非酒精性脂肪肝患者高频超声数据的ML算法识别晚期肝脂肪变性和纤维化

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639128

Lukas Brausch, S. Tretbar, H. Hewener

引用次数: 1

A Numerical Approach to the Magnetic Nanoparticle Hyperthermia 磁性纳米粒子热疗的数值方法

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639139

A. A. Yazdi, Antonio Callejas Zafra, Pablo Moreno, R. Muñoz, J. Melchor

{"title":"A Numerical Approach to the Magnetic Nanoparticle Hyperthermia","authors":"A. A. Yazdi, Antonio Callejas Zafra, Pablo Moreno, R. Muñoz, J. Melchor","doi":"10.1109/LAUS53676.2021.9639139","DOIUrl":"https://doi.org/10.1109/LAUS53676.2021.9639139","url":null,"abstract":"Magnetic Hyperthermia (MH) is an effective way for cancer treatment and enhancing drug delivery. In this method when magnetic nanoparticles are exposed to the magnetic field, start oscillations which can generate ultrasound waves. These resulting oscillations of nanoparticles may lead to the movement of drug carrier Iiposomes, which can be very useful for an efficient targeting in drug delivery, or produce heat in direct tumor cell killing. In this study, a revolved 3D and a 3D model of fixed and randomly distributed Ferromagnetic nanoparticles were developed. In the 3D model a nanoparticle was assumed in the corner of the hydrogel, while in the 3D model around 100 nanoparticles were randomly distributed in the hydrogel using a Swiss cheese model. A circular homogenous multi-turn coil with a voltage of 10 V was considered as the solenoid. The results of the 3D model showed a maximum magnetic flux density of $0.96 T$ which could induce magnetic forces, while the magnetic force can result in the displacement of the magnetic nanoparticles. The results of the revolved 3D model modified the fact that nanoparticles underwent some displacements. The induced nanoparticle displacements could be due to the generation of ultrasound intracellularly which can enhance the efficiency of drug delivery.","PeriodicalId":156639,"journal":{"name":"2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123819167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A pulsed magnetomotive ultrasound imaging system for magnetic nanoparticle detection 一种用于磁性纳米颗粒检测的脉冲磁动超声成像系统

2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS) Pub Date : 2021-10-04 DOI: 10.1109/LAUS53676.2021.9639204

E. E. Mazon, Saeideh Arsalani, João H. Uliana, A. Carneiro, A. Gualdi, T. Pavan

{"title":"A pulsed magnetomotive ultrasound imaging system for magnetic nanoparticle detection","authors":"E. E. Mazon, Saeideh Arsalani, João H. Uliana, A. Carneiro, A. Gualdi, T. Pavan","doi":"10.1109/LAUS53676.2021.9639204","DOIUrl":"https://doi.org/10.1109/LAUS53676.2021.9639204","url":null,"abstract":"Magnetomotive ultrasound (MMUS) imaging has been proposed to overcome the limitation of ultrasound to localize magnetic nanoparticles (MNP) within tissues. A harmonic magnetic field is commonly used; however, this approach can present drawbacks such as heating within amplifier and coil, frequency-dependent tissue mechanical response, and extended magnetic field rise time. Therefore, this study aimed to develop a pulsed electronic system to improve magnetic field application during MMUS. The system was capable of providing a pulsed magnetic stimulation, improving the magnetic field magnitude, and decreasing rise time by the optimization of the electrical properties of the coil used to generate the external magnetic field. The proposed system was evaluated to generate a magnetic field with different pulse durations ranging from 4 ms to 20 ms. Two coil configurations were tested, creating several MMUS images of phantoms, and evaluating their displacement behavior. In addition, the influence of the MNP magnetization on the pulsed MMUS output was studied, obtaining displacement saturation trends for zinc-ferrite MNPs, proving the relationship between the magnetization of MNPs and the displacement generated by the MMUS technique.","PeriodicalId":156639,"journal":{"name":"2021 IEEE UFFC Latin America Ultrasonics Symposium (LAUS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132847777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1