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https://www.readbyqxmd.com/read/28735885/surface-hydrodynamics-of-viscoelastic-fluids-and-soft-solids-surfing-bulk-rheology-on-capillary-and-rayleigh-waves
#1
REVIEW
Francisco Monroy
From the recent advent of the new soft-micro technologies, the hydrodynamic theory of surface modes propagating on viscoelastic bodies has reinvigorated this field of technology with interesting predictions and new possible applications, so recovering its scientific interest very limited at birth to the academic scope. Today, a myriad of soft small objects, deformable meso- and micro-structures, and macroscopically viscoelastic bodies fabricated from colloids and polymers are already available in the materials catalogue...
July 18, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28735336/acoustic-radiation-force-impulse-arfi-elastography-and-serological-markers-in-assessment-of-liver-fibrosis-and-free-portal-pressure-in-patients-with-hepatitis-b
#2
Jun Li, Jie Yu, Xin-Yu Peng, Ting-Ting Du, Jia-Jia Wang, Jin Tong, Gui-Lin Lu, Xiang-Wei Wu
BACKGROUND The aim of this study was to investigate the feasibility of using acoustic radiation force impulse (ARFI) elastography, AST-to-platelet ratio index (APRI), and FIB-4 in assessing liver fibrosis and free portal pressure in patients with hepatitis B. MATERIAL AND METHODS We enrolled 126 patients with hepatitis B who underwent liver surgery at the General Surgery Department of the First Affiliated Hospital of Shihezi University Medical School from February 2013 to August 2015. Preoperatively, shear wave velocity (SWV) of the liver was measured with the Siemens S2000 ultrasound system to reflect liver stiffness...
July 23, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28734190/two-dimensional-modeling-of-elastic-wave-propagation-in-solids-containing-cracks-with-rough-surfaces-and-friction-part-ii-numerical-implementation
#3
Steven Delrue, Vladislav Aleshin, Kevin Truyaert, Olivier Bou Matar, Koen Van Den Abeele
Our study aims at the creation of a numerical toolbox that describes wave propagation in samples containing internal contacts (e.g. cracks, delaminations, debondings, imperfect intergranular joints) of known geometry with postulated contact interaction laws including friction. The code consists of two entities: the contact model and the solid mechanics module. Part I of the paper concerns an in-depth description of a constitutive model for realistic contacts or cracks that takes into account the roughness of the contact faces and the associated effects of friction and hysteresis...
July 13, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28733030/accounting-for-the-spatial-observation-window-in-the-2-d-fourier-transform-analysis-of-shear-wave-attenuation
#4
Ned C Rouze, Yufeng Deng, Mark L Palmeri, Kathryn R Nightingale
Recent measurements of shear wave propagation in viscoelastic materials have been analyzed by constructing the 2-D Fourier transform (2DFT) of the shear wave signal and measuring the phase velocity c(ω) and attenuation α(ω) from the peak location and full width at half-maximum (FWHM) of the 2DFT signal at discrete frequencies. However, when the shear wave is observed over a finite spatial range, the 2DFT signal is a convolution of the true signal and the observation window, and measurements using the FWHM can yield biased results...
July 18, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28731750/coupling-constant-corrections-in-a-holographic-model-of-heavy-ion-collisions
#5
Sašo Grozdanov, Wilke van der Schee
We initiate a holographic study of coupling-dependent heavy ion collisions by analyzing, for the first time, the effects of leading-order, inverse coupling constant corrections. In the dual description, this amounts to colliding gravitational shock waves in a theory with curvature-squared terms. We find that, at intermediate coupling, nuclei experience less stopping and have more energy deposited near the light cone. When the decreased coupling results in an 80% larger shear viscosity, the time at which hydrodynamics becomes a good description of the plasma created from high energy collisions increases by 25%...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731271/ultrasound-elastography-for-carpal-tunnel-pressure-measurement-a-cadaveric-validation-study
#6
Kazutoshi Kubo, Boran Zhou, Yu-Shiuan Cheng, Tai-Hua Yang, Bo Qiang, Kai-Nan An, Steven L Moran, Peter C Amadio, Xiaoming Zhang, Chunfeng Zhao
Carpal tunnel pressure is a key factor in the etiology of carpal tunnel syndrome. Numerous approaches have been conducted to measure carpal tunnel pressure. However, most techniques are invasive and take time and effort. We have developed an innovative approach to noninvasively assess the tunnel pressure by using the ultrasound surface wave elastography (USWE) technique. In a previous study it was shown that the shear wave speed in a tendon increased linearly with increasing tunnel pressure enclosed the tendon in a simple tendon model...
July 21, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28726571/primary-blast-causes-delayed-effects-without-cell-death-in-shell-encased-brain-cell-aggregates
#7
Thomas Sawyer, Yushan Wang, David V Ritzel, Tyson Josey, Mercy Villanueva, Cory Vair, Yanfeng Song, Yimin Shei, Steven Parks, Peggy Nelson, Grant Hennes, Lori McLaws, Changyan Fan
Previous work used underwater explosive exposures to isolate the effects of shock-induced principle stress without shear on rat brain aggregate cultures. This current study has utilized simulated air blast to expose aggregates in suspension and enclosed within a spherical shell, enabling the examination of a much more complex biomechanical insult. Culture medium-filled spheres were exposed to single pulse overpressures of 15-30 psi (6-7 msec duration) and measurements within the sphere at defined sites showed complex and spatially dependent pressure changes...
July 20, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28722439/investigation-of-polymer-plasticizer-blends-as-sh-saw-sensor-coatings-for-detection-of-benzene-in-water-with-high-sensitivity-and-long-term-stability
#8
Pintu Adhikari, Laura Alderson, Florian Bender, Antonio J Ricco, Fabien Josse
We report the first-ever direct detection of benzene in water at concentrations below 100 ppb (parts per billion) using acoustic wave (specifically, shear-horizontal surface acoustic wave, SH-SAW) sensors with plasticized polymer coatings. Two polymers and two plasticizers were studied as materials for sensor coatings. For each polymer-plasticizer combination, the influence of the mixing ratio of the blend on the sensitivity to benzene was measured and compared to commercially available polymers that were used for BTEX (benzene, toluene, ethylbenzene, and xylene) detection in previous work...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28720285/ultrasound-based-shear-wave-elastography-in-the-assessment-of-patients-with-diabetic-kidney-disease
#9
Flaviu Bob, Iulia Grosu, Ioan Sporea, Simona Bota, Alina Popescu, Alexandra Sima, Roxana Şirli, Ligia Petrica, Romulus Timar, Adalbert Schiller
In previous studies of acoustic radiation force impulse (ARFI) elastography, using Virtual Touch tissue quantification (VTQ) (Siemens Acuson S2000), it was reported that the measurement of renal shear wave speed in patients with chronic kidney disease (CKD) is not influenced exclusively by renal fibrosis. The purpose of the present study was to analyze the role of VTQ in patients with diabetic kidney disease, considered the main cause of CKD. The study group included 164 patients: 80 patients with diabetic kidney disease (DKD) and 84 without renal disease or diabetes mellitus...
July 15, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28720056/influence-of-tissue-microstructure-on-shear-wave-speed-measurements-in-plane-shear-wave-elastography-a-computational-study-in-lossless-fibrotic-liver-media
#10
Yu Wang, Jingfeng Jiang
Shear wave elastography (SWE) has been used to measure viscoelastic properties for characterization of fibrotic livers. In this technique, external mechanical vibrations or acoustic radiation forces are first transmitted to the tissue being imaged to induce shear waves. Ultrasonically measured displacement/velocity is then utilized to obtain elastographic measurements related to shear wave propagation. Using an open-source wave simulator, k-Wave, we conducted a case study of the relationship between plane shear wave measurements and the microstructure of fibrotic liver tissues...
July 1, 2017: Ultrasonic Imaging
https://www.readbyqxmd.com/read/28709329/empirical-resistive-force-theory-for-slender-biological-filaments-in-shear-thinning-fluids
#11
Emily E Riley, Eric Lauga
Many cells exploit the bending or rotation of flagellar filaments in order to self-propel in viscous fluids. While appropriate theoretical modeling is available to capture flagella locomotion in simple, Newtonian fluids, formidable computations are required to address theoretically their locomotion in complex, nonlinear fluids, e.g., mucus. Based on experimental measurements for the motion of rigid rods in non-Newtonian fluids and on the classical Carreau fluid model, we propose empirical extensions of the classical Newtonian resistive-force theory to model the waving of slender filaments in non-Newtonian fluids...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28708552/dual-phase-transmit-focusing-for-multi-angle-compound-shear-wave-elasticity-imaging
#12
Heechul Yoon, Salavat R Aglyamov, Stanislav Y Emelianov
Shear wave elasticity imaging (SWEI) enables the quantitative assessment of the mechanical properties of tissue. In SWEI, the effective generation of acoustic radiation force is of paramount importance. Consequently, several research groups have investigated various transmit beamforming and pulse-sequencing methods. To further improve the efficiency of shear wave generation, and therefore, to increase the quality of SWEI, we introduce a technique referred to as "multi-angle compound SWEI" (MAC-SWEI), which uses simultaneous multi-angular push beams created by dual-phase transmit focusing...
July 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28708299/shear-wave-elastography-for-surgically-verified-breast-papillary-lesions-is-it-effective-for-differentiation-between-benign-and-malignant-lesions
#13
Hye Jeong Choi, Kyung Hee Ko, Hae Kyoung Jung
OBJECTIVES: To evaluate the effectiveness of shear wave elastography (SWE) for differentiating benign from malignant breast papillary lesions METHODS: B-mode ultrasound (US) and SWE were available in 56 surgically confirmed papillary lesions (48 [85.7%] benign and 8 [14.3%] malignant). The diagnostic performances of US, SWE parameters, and combined US with SWE parameters were calculated by receiver operating characteristic curve analysis and compared. RESULTS: The highest area under the receiver operating characteristic curve (Az ) value for US was 0...
July 14, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28705556/supersonic-shear-wave-imaging-of-the-spleen-for-staging-of-liver-fibrosis-in-rats
#14
Xiang-Dong Hu, Hui-Ying Geng, Lei Wang, Hu-Feng Xu, Yuan Su, Si Liang, Lin-Xue Qian
The goal of the work described here was to explore the cause of spleen stiffness (SS) in hepatic fibrogenesis and evaluate the value of SS in liver fibrosis (LF) staging. LF was induced with carbon tetrachloride (CCl4) in rats (n = 40). Supersonic shear wave imaging and contrast-enhanced ultrasound were performed to determine liver stiffness (LS), SS and splenic hemodynamics. SS, LS and free portal pressure exhibited moderate correlations with fibrosis stage (r = 0.744-0.835, p < 0.001). Time-intensity curves of contrast-enhanced ultrasound for the spleen were presented as decreasing peak intensity and slope of decrease, and increasing time to peak...
July 10, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28705067/pancreatic-elastography-from-acoustic-radiation-force-impulse-imaging-for-evaluation-of-diabetic-microangiopathy
#15
Yu He, Hui Wang, Xiao Ping Li, Juan-Juan Zheng, Chun-Xiang Jin
OBJECTIVE: The purposes of this study were to compare pancreatic shear-wave velocity (SWV) in subjects with and those without diabetic microvascular complications and to investigate the feasibility of pancreatic SWV in evaluating diabetic microangiopathy. SUBJECTS AND METHODS: SWV measurements were prospectively performed in 115 patients with diabetes mellitus and 115 healthy persons by use of acoustic radiation force impulse imaging. Patients with diabetes were divided into subgroups with and without microangiopathy...
July 13, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28705060/usefulness-of-multiparametric-ultrasound-for-evaluating-structural-abnormality-of-transplanted-kidney-can-we-predict-histologic-abnormality-on-renal-biopsy-in-advance
#16
Moon Gyu Yoo, Dae Chul Jung, Young Taik Oh, Sung Yoon Park, Kyunghwa Han
OBJECTIVE: The purpose of this study was to investigate the associations between microscopic abnormalities of transplanted kidneys and sonography-based imaging biomarkers, including elasticity, venous impedance index, arterial resistive index, and size. MATERIALS AND METHODS: Between 2011 and 2015, 159 recipients underwent sonography and biopsy of a transplanted kidney at our institution; 104 adult patients were included in this study. The maximal longitudinal length on gray-scale images, arterial resistive index, and venous impedance index on Doppler images and shear wave velocity on acoustic radiation force impulse imaging or Young modulus on supersonic shear imaging were measured before biopsy...
July 13, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28704775/evaluating-the-reinforcement-content-and-elastic-properties-of-mg-based-composites-using-dual-mode-ultrasonic-velocities
#17
Yu Liu, Yongfeng Song, Xiongbing Li, Chao Chen, Kechao Zhou
Based on the wave-mode-converted principle, an immersion-focused transducer is employed to determine the longitudinal wave and shear wave velocities. The experimental condition is then investigated to obtain the converted shear wave, which is used to analyze the relationship between the reinforcement content and the dual-mode ultrasonic velocities. In addition, the elastic modulus is calculated. Magnesium-based composite samples with different reinforcement contents are manufactured to conduct an ultrasonic experiment, wherein the dual-mode velocities vary with the change in the reinforcement content; the correlation coefficient is 99...
November 2017: Ultrasonics
https://www.readbyqxmd.com/read/28698632/quality-measurement-of-two-dimensional-shear-wave-speed-imaging-for-breast-lesions-the-associated-factors-and-the-impact-to-diagnostic-performance
#18
Dan-Dan Li, Hui-Xiong Xu, Bo-Ji Liu, Xiao-Wan Bo, Xiao-Long Li, Rong Wu
This study aimed to identify the associated factors for quality measurement (QM) of shear wave speed (SWS) imaging and to validate the additional value of QM in the diagnosis of breast lesions. From September 2014 to February 2015, conventional ultrasound and SWS imaging were performed in 338 women with 361 breast lesions. Binary logistic regression was used to identify associated factors for QM. Sensitivity, specificity and the area under receiver operating characteristic (ROC) curve (AUC) among maximum SWS (SWS max ), QM and SWS max plus QM (SWS max +QM) were compared to validate additional value of QM...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698404/association-of-conventional-ultrasound-elastography-and-clinicopathological-factors-with-axillary-lymph-node-status-in-invasive-ductal-breast-carcinoma-with-sizes-10-mm
#19
Hui Liu, Guang Xu, Ming-Hua Yao, Huan Pu, Yan Fang, Li-Hua Xiang, Rong Wu
BACKGROUND: To evaluate whether conventional ultrasound, elastography [conventional strain elastography of elasticity imaging, acoustic radiation force impulse induced strain elastography of virtual touch tissue imaging, and a novel two-dimensional shear wave elastography of virtual touch tissue imaging quantification] and clinicopathological factors are associated with axillary lymph node metastasis in invasive ductal breast carcinoma with sizes > 10 mm. MATERIALS AND METHODS: We evaluated 150 breast lesions from 148 patients using the above methods and the clinicopathological factors...
July 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28691320/use-of-ultrasound-shear-wave-elastography-to-evaluate-change-in-cervical-stiffness-during-pregnancy
#20
Tetsuo Ono, Daisuke Katsura, Kazutaka Yamada, Kaori Hayashi, Akiko Ishiko, Shunichiro Tsuji, Fuminori Kimura, Kentaro Takahashi, Takashi Murakami
AIM: The aim of this study was to evaluate the usefulness of shear-wave elastography (SWE) for measuring change in cervical stiffness during pregnancy, with regions of interest (ROI) designed for easy identification. METHODS: A total of 280 women were enrolled in this study. SWE was performed at a routine prenatal visit. A measurement area was chosen at the anterior part of the cervix, and a circular ROI 5 mm in diameter was set at two points, 5-10 mm (lower point) and 15-20 mm (upper point) from the external cervical os...
July 10, 2017: Journal of Obstetrics and Gynaecology Research
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