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Shear wave

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https://www.readbyqxmd.com/read/27910698/laser-induced-fluorescence-measurements-of-axial-velocity-velocity-shear-and-parallel-ion-temperature-profiles-during-the-route-to-plasma-turbulence-in-a-linear-magnetized-plasma-device
#1
S Chakraborty Thakur, K Adriany, J J Gosselin, J McKee, E E Scime, S H Sears, G R Tynan
We report experimental measurements of the axial plasma flow and the parallel ion temperature in a magnetized linear plasma device. We used laser induced fluorescence to measure Doppler resolved ion velocity distribution functions in argon plasma to obtain spatially resolved axial velocities and parallel ion temperatures. We also show changes in the parallel velocity profiles during the transition from resistive drift wave dominated plasma to a state of weak turbulence driven by multiple plasma instabilities...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910353/design-of-tangential-viewing-phase-contrast-imaging-for-turbulence-measurements-in-jt-60sa
#2
K Tanaka, S Coda, M Yoshida, H Sasao, Y Kawano, R Imazawa, H Kubo, Y Kamada
A tangential viewing phase contrast imaging system is being designed for the JT-60SA tokamak to investigate microturbulence. In order to obtain localized information on the turbulence, a spatial-filtering technique is applied, based on magnetic shearing. The tangential viewing geometry enhances the radial localization. The probing laser beam is injected tangentially and traverses the entire plasma region including both low and high field sides. The spatial resolution for an Internal Transport Barrier discharge is estimated at 30%-70% of the minor radius at k = 5 cm(-1), which is the typical expected wave number of ion scale turbulence such as ion temperature gradient/trapped electron mode...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27908029/in-situ-measurements-of-sediment-acoustic-properties-in-currituck-sound-and-comparison-to-models
#3
Kevin M Lee, Megan S Ballard, Andrew R McNeese, Thomas G Muir, Preston S Wilson, R Daniel Costley, Kent K Hathaway
In situ measurements of compressional and shear wave speed and attenuation were collected 30 cm below the water-sediment interface in Currituck Sound, North Carolina at two field locations having distinctly different sediment types: medium-to-fine-grained sand and fine-grained sand with approximately 10% mud content. Shear wave measurements were performed with bimorph transducers to generate and receive horizontally polarized shear waves in the 300 Hz to 1 kHz band, and compressional wave measurements were performed using hydrophones operated in the 5 kHz to 100 kHz band...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27906671/risk-stratification-of-thyroid-nodules-with-bethesda-category-iii-results-on-fine-needle-aspiration-cytology-the-additional-value-of-acoustic-radiation-force-impulse-elastography
#4
Chong-Ke Zhao, Hui-Xiong Xu, Jun-Mei Xu, Cheng-Yu Sun, Wei Chen, Bo-Ji Liu, Xiao-Wan Bo, Dan Wang, Shen Qu
To assess the value of conventional ultrasound, conventional strain elastography (CSE) and acoustic radiation force impulse (ARFI) elastography in differentiating likelihood of malignancy for Bethesda category III thyroid nodules. 103 thyroid nodules with Bethesda category III results on fine-needle aspiration cytology (FNAC) in 103 patients were included and all were pathologically confirmed after surgery. Conventional ultrasound, CSE and ARFI elastography including ARFI imaging and point shear wave speed (SWS) measurement were performed...
November 29, 2016: Oncotarget
https://www.readbyqxmd.com/read/27903789/a-color-doppler-shear-wave-imaging-phase-reconstruction-method-using-four-color-flow-images
#5
Naoki Sunaguchi, Yoshiki Yamakoshi, Takahito Nakajima
This study investigates shear wave phase map reconstruction using a limited number of color flow images (CFIs) acquired with a color Doppler ultrasound imaging instrument. We propose an efficient reconstruction method to considerably reduce the number of CFIs required for reconstruction and compare this method with Fourier analysis-based color Doppler shear wave imaging. The proposed method uses a two-step phase reconstruction process, including an initial phase map derived from four CFIs using an advanced iterative algorithm of optical interferometry...
November 30, 2016: Ultrasonic Imaging
https://www.readbyqxmd.com/read/27902782/correction-shear-wave-elastography-assessments-of-quadriceps-stiffness-changes-prior-to-during-and-after-prolonged-exercise-a-longitudinal-study-during-an-extreme-mountain-ultra-marathon
#6
Pierre Andonian, Magalie Viallon, Caroline Le Goff, Charles de Bourguignon, Charline Tourel, Jérome Morel, Guido Giardini, Laurent Gergelé, Grégoire P Millet, Pierre Croisille
[This corrects the article DOI: 10.1371/journal.pone.0161855.].
2016: PloS One
https://www.readbyqxmd.com/read/27900958/renal-shear-wave-velocity-and-estimated-glomerular-filtration-rate-in-children-with-chronic-kidney-disease
#7
Costanza Bruno, Milena Brugnara, Rocco Micciolo, Mariangela Cecchetto, Michele Zuffante, Alessandra Bucci, Marco Zaffanello
A shear wave velocity (SWV) value obtained by the acoustic radiation force impulse technique depends on tissue elasticity. We investigated the relationship between SWV values and the estimated glomerular filtration rate (eGFR) in children with chronic kidney disease. A total of 29 patients were enrolled in the study. There were 18 primary and 11 secondary cases of vesicoureteral reflux. eGFR was calculated using Schwartz's formulas (2012). Partial eGFR for each kidney was assessed by multiplying the eGFR by the percentage of renal function measured by means of renal (99m)Tc-dimercaptosuccinic acid scintigraphy...
November 2016: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/27896400/quantitative-assessment-of-the-supraspinatus-tendon-on-mri-using-t2-t2-mapping-and-shear-wave-ultrasound-elastography-a-pilot-study
#8
Konstantin Krepkin, Mary Bruno, José G Raya, Ronald S Adler, Soterios Gyftopoulos
OBJECTIVE: To determine whether there is an association between T2/T2* mapping and supraspinatus tendon mechanical properties as assessed by shear-wave ultrasound elastography (SWE). MATERIALS AND METHODS: This HIPAA-compliant prospective pilot study received approval from our hospital's institutional review board. Eight patients (3 males/5 females; age range 44-72 years) and nine shoulders underwent conventional shoulder MRI, T2/T2* mapping on a 3-T scanner, and SWE...
November 28, 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/27893857/shear-wave-elastography-for-the-differential-diagnosis-of-breast-papillary-lesions
#9
Jin Chung, Won Kyung Lee, Eun-Suk Cha, Jee Eun Lee, Jeoung Hyun Kim, Young Hoon Ryu
OBJECTIVE: To evaluate the diagnostic performance of shear-wave elastography (SWE) for the differential diagnosis of breast papillary lesions. METHODS: This study was an institutional review board-approved retrospective study, with a waiver of informed consent. A total of 79 breast papillary lesions in 71 consecutive women underwent ultrasound and SWE prior to biopsy. Ultrasound features and quantitative SWE parameters were recorded for each lesion. All lesions were surgically excised or excised using an ultrasound-guided vacuum-assisted method...
2016: PloS One
https://www.readbyqxmd.com/read/27886553/mechanical-stress-regulates-transport-in-a-compliant-3d-model-of-the-blood-brain-barrier
#10
Paul P Partyka, George A Godsey, John R Galie, Mary C Kosciuk, Nimish K Acharya, Robert G Nagele, Peter A Galie
Transport of fluid and solutes is tightly controlled within the brain, where vasculature exhibits a blood-brain barrier and there is no organized lymphatic network facilitating waste transport from the interstitial space. Here, using a compliant, three-dimensional co-culture model of the blood-brain barrier, we show that mechanical stimuli exerted by blood flow mediate both the permeability of the endothelial barrier and waste transport along the basement membrane. Application of both shear stress and cyclic strain facilitates tight junction formation in the endothelial monolayer, with and without the presence of astrocyte endfeet in the surrounding matrix...
November 17, 2016: Biomaterials
https://www.readbyqxmd.com/read/27886002/three-dimensional-vs-two-dimensional-shear-wave-elastography-of-the-testes-preliminary-study-on-a-healthy-collective
#11
J Marcon, M Trottmann, J Rübenthaler, M D'Anastasi, C G Stief, M F Reiser, D A Clevert
INTRODUCTION: Shear wave elastography (SWE) and its derivative Supersonic Shear Imaging (SSI) are newer techniques for the determination of tissue elasticity by measuring the velocity of generated shear waves (SWV), which correlates positively with tissue stiffness.The techniques are integrated into many modern ultrasound systems and have been examined in the evaluation of viscoelastic properties of different organ systems. Two-dimensional shear wave elastography (2D SWE) of the testes has been found to be a useful tool in recent studies which included the determination of standard values in healthy volunteers...
November 23, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27876713/role-of-acoustic-radiation-force-impulse-arfi-elastography-in-determination-of-severity-of-benign-prostate-hyperplasia
#12
Bircan Alan, Mazhar Utangaç, Cemil Göya, Mansur Dağgülli
BACKGROUND The aim of this study was to investigate the potential contribution of acoustic radiation force impulse (ARFI) elastography to the determination of the severity of benign prostate hypertrophy (BPH) by performing shear wave velocity (SWV) measurements of the prostate using ARFI technology. MATERIAL AND METHODS Sixty BPH patients and 40 healthy volunteers were included in this study. SWV measurements of the prostate were performed by transabdominal ultrasonography (US), both in the BPH patients and control subjects...
November 23, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/27872417/virtual-touch-quantification-of-the-salivary-glands-for-diagnosis-of-primary-sj%C3%A3-gren-syndrome
#13
Shaoqi Chen, Yukai Wang, Shaoxing Chen, Qiulin Wu, Shigao Chen
OBJECTIVES: To investigate the value of salivary gland stiffness measured by Virtual Touch quantification (VTQ; Siemens Medical Solutions, Erlangen, Germany) for assessment of primary Sjögren syndrome. METHODS: Fifty-four patients with primary Sjögren syndrome, 35 patients without primary Sjögren syndrome (patients with dry mouth and dry eye symptoms), and 52 healthy control volunteers were included in this study. Patients with primary Sjögren syndrome were classified as early or advanced stage by labial gland biopsies...
December 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27872416/initial-experience-with-ultrasound-elastography-for-diagnosis-of-major-salivary-gland-lesions
#14
Hang Zhou, Xian-Li Zhou, Hui-Xiong Xu, Ya-Ping He, Xiao-Wan Bo, Xiao-Long Li, Bo-Ji Liu, Dan-Dan Li, Dan Wang
OBJECTIVES: The aim of this study was to evaluate the usefulness of ultrasound elastography, including conventional strain elastography, acoustic radiation force impulse (ARFI)-induced strain elastography, and point shear wave elastography (SWE) for diagnosis of major salivary gland lesions. METHODS: Forty major salivary gland lesions underwent conventional sonography, conventional strain elastography, ARFI strain elastography, and point SWE before surgery or biopsy...
December 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27872413/is-there-any-difference-between-seminomas-and-nonseminomatous-germ-cell-tumors-on-shear-wave-elastography-a-preliminary-study
#15
Atilla Suleyman Dikici, Mehmet Emin Er, Deniz Alis, Cesur Samanci, Fethi Emre Ustabasioglu, Cetin Demirdag, Haydar Durak, Fatih Kantarci, Ismail Mihmanli
OBJECTIVES: The purpose of this study was to evaluate the ability of shear wave elastography (SWE) to differentiate seminomas from nonseminomatous germ cell tumors. METHODS: Approval for this retrospective study was obtained from the local Ethics Committee of Istanbul University Cerrahpasa Medical School. Fifteen patients with malignant testicular lesions were examined by grayscale sonography, color or power Doppler sonography, and SWE between February 2011 and October 2015...
December 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27868416/-comparison-of-fibrotouch-and-acoustic-radiation-force-impulse-in-diagnosis-of-liver-fibrosis-in-patients-with-chronic-hepatitis-b
#16
Fang Liu, Lin Wei, Shanshan Wang, Bin Huang
Objective: To compare transient elastorgaphy (FibroTouch) and acoustic radiation force impulse (ARFI) in diagnosis of liver fibrosis in patients with chronic hepatitis B. Methods: One hundred and forty five patients with chronic hepatitis B underwent FibroTouch and ARFI examinations in Xixi Hospital of Hangzhou from January to November 2015. The liver stiffness (LSM) was detected by FibroTouch and the liver shear wave velocity (VTQ) was detected by ARFI; liver biopsy was performed in all patients. With biopsy results as gold standards, the diagnostic values of FibroTouch and ARFI for liver fibrosis were analyzed with Spearman correlation analysis and receiver operating characteristic (ROC) curve...
May 25, 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/27865773/particulate-suspension-effect-on-peristaltically-induced-unsteady-pulsatile-flow-in-a-narrow-artery-blood-flow-model
#17
Sara I Abdelsalam, Kambiz Vafai
This work is concerned with theoretically investigating the pulsatile flow of a fluid with suspended particles in a flow driven by peristaltic waves that deform the wall of a small blood artery in the shape of traveling sinusoidal waves with constant velocity. The problem formulation in the wave frame of reference is presented and the governing equations are developed up to the second-order in terms of the asymptotic expansion of Womersley number which characterizes the unsteady effect in the wave frame. We suppose that the flow rate imposed, in this frame, is a function versus time...
November 16, 2016: Mathematical Biosciences
https://www.readbyqxmd.com/read/27863341/physical-constraints-on-the-non-dimensional-absorption-coefficients-of-compressional-and-shear-waves-for-viscoelastic-cylinders
#18
F G Mitri, Z E A Fellah
BACKGROUND: Normalized absorption coefficients for the longitudinal and shear waves in viscoelastic (polymer-type) materials, extracted from non-fictional experimental data showed anomalous effects, such as the generation of a negative radiation force (NRF) in plane progressive waves, negative energy absorption and extinction efficiencies and a scattering enhancement, not in agreement with energy conservation. OBJECTIVE: The objective of this work is directed towards analyzing those anomalies from the standpoint of energy conservation...
February 2017: Ultrasonics
https://www.readbyqxmd.com/read/27860475/-new-diagnostic-imaging-technique-shear-wave-elastography
#19
M Zemanová
Shear wave elastography (SWE) is a new non-invasive diagnostic imaging technique, that maps the elastic properties of tissues. Nowadays this modality develops increasingly in medicine across its disciplines and opens a new era of high-quality ultrasound examination because it increases the specificity and thus improves diagnostic assurance. This method is similar to manual palpation, shows elastic properties of biological tissues and provides a kind of reconstruction of the internal structure of soft tissues based on measurement of the response of tissue compression...
2016: Ceská a Slovenská Oftalmologie
https://www.readbyqxmd.com/read/27858670/viscoelastic-properties-of-normal-rat-liver-measured-by-ultrasound-elastography-comparison-with-oscillatory-rheometry
#20
Haoming Lin, Yuanyuan Shen, Xin Chen, Ying Zhu, Yi Zheng, Xinyu Zhang, Yanrong Guo, Tianfu Wang, Siping Chen
BACKGROUND: Ultrasound elastography has been widely used to measure liver stiffness. However, the accuracy of liver viscoelasticity obtained by ultrasound elastography has not been well established. OBJECTIVE: To assess the accuracy of ultrasound elastography for measuring liver viscoelasticity and compare to conventional rheometry methods. In addition, to determine if combining these two methods could delineate the rheological behavior of liver over a wide range of frequencies...
November 14, 2016: Biorheology
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