2019 IEEE International Ultrasonics Symposium (IUS)最新文献_第10页

Regulating the differentiation of PC12 by acoustic fluid stimulation 声波流体刺激对PC12分化的调节作用

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8926311

Shan He, W. Pang, X. Duan, Yanyan Wang

引用次数: 1

Non-Contrast Perfusion Detection with ARFI Variance of Acceleration (VoA) Imaging: Phantom and In Vivo Results 非对比灌注检测与ARFI加速度方差(VoA)成像:幻体和体内结果

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8926231

R. Varadarajan, Gabriela Torres, M. Hossain, C. Gallippi

{"title":"Non-Contrast Perfusion Detection with ARFI Variance of Acceleration (VoA) Imaging: Phantom and In Vivo Results","authors":"R. Varadarajan, Gabriela Torres, M. Hossain, C. Gallippi","doi":"10.1109/ULTSYM.2019.8926231","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8926231","url":null,"abstract":"Low blood SNR makes detecting small vessels, measuring slow flow rates, and assessing blood perfusion without contrast administration challenging. A potential approach is to use Variance of Acceleration (VoA) imaging, which has been demonstrated previously in humans in vivo for monitoring subcutaneous bleeding and delineating intraplaque hemorrhage. We hypothesize that, without the addition of contrast agents, VoA can detect slow flow in small vessels for perfusion assessment. Experiments were performed on an ATS 700-D 527 calibrated flow phantom (vessel diameter of 1 mm, flow rates of 0-53 cm/s) and in the surgically exteriorized right kidneys of 3 pigs (2M/1F, mean body weight of 74.4 ± 9.3 kg) at baseline and after inducing ischemia. In the phantom, logVoA increased in the vessel with increasing flow rate, and it remained constant in the background. LogVoA values were higher in the background with versus without the ARF excitation. Similarly, logVoA values were higher in the vessel, particularly for flow rates < 12 cm/s, with versus without ARF excitation. Vessel CNR by logVoA was higher with versus without ARF excitation for flow rates < 12 cm/s, and CNR by logVoA was greater than CNR by power Doppler for all flow rates. Additionally, logVoA was statistically significantly greater at baseline than ischemia in all three in vivo pig kidneys. Finally, logVoA delineates a 1.25 mm-diameter vessel in a pig renal cortex in vivo, while power Doppler does not. These results suggest that logVoA could support contrast-free detection of slow blood flow in small vessels and in vivo perfusion assessment.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"7 1","pages":"2252-2255"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84250931","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

Non-Classical Second-Order Nonlinear Elastic Wave Interactions 非经典二阶非线性弹性波相互作用

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8925682

A. Demčenko, M. Mazilu, R. Wilson, J. Reboud, J. Cooper

引用次数: 1

Phase Aberration Correction in Transcranial Ultrasound Imaging using Averaged Sound Velocity Map in Delay-and-Sum Beamformer 利用延迟和波束形成器平均声速图校正经颅超声成像中的相位像差

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8926091

Moein Mozaffarzadeh, Claudio Minonzio, M. Verweij, S. Hemm, V. Daeichin

引用次数: 1

Detection and acoustical visualization of internal defects in shotcrete structures by spatial spectral entropy for noncontact acoustic inspection method 基于空间谱熵的喷射混凝土结构内部缺陷检测及声学可视化

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8925999

K. Sugimoto, T. Sugimoto, H. Morioka, N. Utagawa, Chitose Kuroda, Takeyuki Ohdaira

{"title":"Detection and acoustical visualization of internal defects in shotcrete structures by spatial spectral entropy for noncontact acoustic inspection method","authors":"K. Sugimoto, T. Sugimoto, H. Morioka, N. Utagawa, Chitose Kuroda, Takeyuki Ohdaira","doi":"10.1109/ULTSYM.2019.8925999","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925999","url":null,"abstract":"Deterioration of concrete structures is a serious problem in social infrastructures such as tunnels and viaducts. In order to solve this problem, we have examined the method to inspect the internal defects of concrete structure in a noncontact and non-destructive manner. In our noncontact acoustic inspection method, the concrete surface is vibrated by strong airborne sound waves, 2-dimensional distribution of vibration velocity is measured by a scanning laser Doppler vibrometer (SLDV). And the internal defects (up to a depth of about 10 cm from the surface) is detected from a long distance (about 5-30m). It was made possible to detect internal defects of concrete with smooth surface in a released space such as a viaduct or a tunnel. However, in a closed space surrounded by concrete, such as an underground cavity, the S/N ratio was lowered due to reverberation from the surroundings. In shotcrete with uneven surface, the reflectance of laser light on the surface varies. And it is more difficult to detect internal defects. To detect internal defects of concrete, we have proposed the defect detection algorithm combining acoustic features (vibrational energy ratio and spectral entropy). At a measured point of internal defect, vibrational energy tends to be high and spectral entropy tends to be low. Since acoustic excitation is used, in a closed space, more intense resonance occurs in a head of SLDV due to reverberation from the surroundings. Since resonance frequency of a laser head and its frequency range can be detected by spatial spectral entropy (SSE) proposed previously, the resonance frequency peaks can be removed in data analysis. In addition, the influence of shotcrete surface was reduced by detecting resonance frequencies of internal defects on the measured surface by SSE, selecting frequency bands to analyze, and statistically evaluating healthy part by two acoustical features.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"61 1","pages":"2099-2102"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85054918","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

Neural Network-Based Detection of Ultrasonic Targets with Respect to Noise and Number of Sampling Positions 基于噪声和采样位置数的超声目标神经网络检测

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8926202

P. Kroh, Ralph Simon, S. Rupitsch

引用次数: 1

FBAR Duplexers with Minimal Shunt Inductance for Better Isolation and Packing Density 具有最小分流电感的FBAR双工器，具有更好的隔离和包装密度

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8926131

P. Bradley, S. Lee, M.S. Kang, J. Kim

引用次数: 2

Vector Flow Velocity Estimation from Beamsummed Data Using Deep Neural Networks 基于深度神经网络的波束和数据矢量流速估计

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8925825

Y. Li, D. Hyun, J. Dahl

引用次数: 3

Estimation of transducer translation using channel-domain correlation 利用信道域相关估计换能器平移

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8925652

Nick Bottenus

引用次数: 0

Strain sensitivity enhancement of ultrasonic waves in plates using phase filter 用相位滤波器增强超声波在平板中的应变灵敏度

2019 IEEE International Ultrasonics Symposium (IUS) Pub Date : 2019-10-01 DOI: 10.1109/ULTSYM.2019.8925997

Lucas M. Martinho, A. Kubrusly, N. Pérez, A. Braga, Jean Pierre von der Weid

{"title":"Strain sensitivity enhancement of ultrasonic waves in plates using phase filter","authors":"Lucas M. Martinho, A. Kubrusly, N. Pérez, A. Braga, Jean Pierre von der Weid","doi":"10.1109/ULTSYM.2019.8925997","DOIUrl":"https://doi.org/10.1109/ULTSYM.2019.8925997","url":null,"abstract":"Ultrasonic guided waves can be used to measure mechanical strain in plates due to the stress-induced velocity change. Strain monitoring is usually performed by measuring the time-of-flight shift. However, interpretation of results can be difficult due to wave mixing, mainly when several dispersive modes propagate, or in the presence of reflections. In these cases, the time-reversal focusing technique can be used to monitor the strain level, by observing the peak of the focused time-reversal signal, which changes proportionally to the strain level. However, not all components of the spectrum contribute with the same sensitivity to strain changes. In this paper, we developed a signal filtering procedure based on the phase of the Fourier spectrum that increases the time-reversal strain sensitivity. The time-reversal process is modified by using a new signal as reference which is synthesized relying on prior knowledge of the impulse response at some non-null strain level. The technique was evaluated with different pairs of transducers in an aluminium plate, effectively producing more strain-sensitive signals. However, high strain-sensitive signal presents poor energy concentration which, in turn, can be difficult to detect. The technique can be adapted to provide strain-robust signals.","PeriodicalId":6759,"journal":{"name":"2019 IEEE International Ultrasonics Symposium (IUS)","volume":"29 1","pages":"928-931"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79812737","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