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https://www.readbyqxmd.com/read/28922441/evaluation-of-2d-shear-wave-elastography-for-characterisation-of-focal-liver-lesions
#1
Ludmila Gerber, Daniel Fitting, Kajana Srikantharajah, Nina Weiler, Georgia Kyriakidou, Joerg Bojunga, Falko Schulze, Dimitra Bon, Stefan Zeuzem, Mireen Friedrich-Rust
BACKGROUND AND AIM: This is a prospective study for evaluation of 2D-shear wave elastography (2D-SWE) for characterisation and differentiation of benign und malignant focal liver lesions (FLLs). METHODS: The patients referred to our ultrasound unit were prospectively included. B-mode ultrasound and 2D-SWE (Aixplorer® France) were performed for one FLL in each patient. Liver histology and/or contrast-enhanced imaging were used as a reference method. RESULTS: 140 patients with FLL were included...
September 2017: Journal of Gastrointestinal and Liver Diseases: JGLD
https://www.readbyqxmd.com/read/28919161/magnetic-resonance-elastography-of-the-brain-a-comparison-between-pigs-and-humans
#2
Johannes Weickenmeier, Mehmet Kurt, Efe Ozkaya, Max Wintermark, Kim Butts Pauly, Ellen Kuhl
Magnetic resonance elastography holds promise as a non-invasive, easy-to-use, in vivo biomarker for neurodegenerative diseases. Throughout the past decade, pigs have gained increased popularity as large animal models for human neurodegeneration. However, the volume of a pig brain is an order of magnitude smaller than the human brain, its skull is 40% thicker, and its head is about twice as big. This raises the question to which extent established vibration devices, actuation frequencies, and analysis tools for humans translate to large animal studies in pigs...
August 26, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28912436/distributed-acoustic-sensing-for-seismic-monitoring-of-the-near-surface-a-traffic-noise-interferometry-case-study
#3
Shan Dou, Nate Lindsey, Anna M Wagner, Thomas M Daley, Barry Freifeld, Michelle Robertson, John Peterson, Craig Ulrich, Eileen R Martin, Jonathan B Ajo-Franklin
Ambient-noise-based seismic monitoring of the near surface often has limited spatiotemporal resolutions because dense seismic arrays are rarely sufficiently affordable for such applications. In recent years, however, distributed acoustic sensing (DAS) techniques have emerged to transform telecommunication fiber-optic cables into dense seismic arrays that are cost effective. With DAS enabling both high sensor counts ("large N") and long-term operations ("large T"), time-lapse imaging of shear-wave velocity (V S ) structures is now possible by combining ambient noise interferometry and multichannel analysis of surface waves (MASW)...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28906009/does-lesion-size-affect-the-value-of-shear-wave-elastography-for-differentiating-between-benign-and-malignant-thyroid-nodules
#4
Fen Wang, Cai Chang, Min Chen, Yi Gao, Ya-Ling Chen, Shi-Chong Zhou, Jia-Wei Li, Wen-Xiang Zhi
OBJECTIVES: We aimed to investigate the diagnostic performance of shear wave elastography (SWE) combined with conventional ultrasonography (US) for differentiating between benign and malignant thyroid nodules of different sizes. METHODS: A total of 445 thyroid nodules from 445 patients were divided into 3 groups based on diameter (group 1, ≤ 10 mm; group 2, 10-20 mm; and group 3, > 20 mm). The mean elasticity index of the whole lesion was automatically calculated, and the threshold for differentiation between benign and malignant nodules was constructed by a receiver operating characteristic curve analysis...
September 14, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28905143/the-value-of-quantitative-shear-wave-elastography-in-differentiating-the-cervical-lymph-nodes-in-patients-with-thyroid-nodules
#5
Jun You, Juan Chen, Feixiang Xiang, Yue Song, Simai Khamis, Chengfa Lu, Qing Lv, Yanrong Zhang, Mingxing Xie
PURPOSE: This study aimed at evaluating the diagnostic performance of quantitative shear wave elastography (SWE) in differentiating metastatic cervical lymph nodes from benign nodes in patients with thyroid nodules. METHODS: One hundred and forty-one cervical lymph nodes from 39 patients with thyroid nodules that were diagnosed as papillary thyroid cancer had been imaged with SWE. The shear elasticity modulus, which indicates the stiffness of the lymph nodes, was measured in terms of maximum shear elasticity modulus (maxSM), minimum shear elasticity modulus (minSM), mean shear elasticity modulus (meanSM), and standard deviation (SD) of the shear elasticity modulus...
September 13, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28902405/preparation-and-characterization-of-dendrobium-officinale-powders-through-superfine-grinding
#6
Qingran Meng, Haoran Fan, Feng Chen, Tiancun Xiao, Lianfu Zhang
BACKGROUND: Dendrobium officinale has been used in China for several thousand years as a health food, it has become one of the most expensive tea materials worldwide due to extremely scarce wild resources and increasing demand. Hence, it is very important to improve the depth and width of its application. In present work, the physico-chemical, surface chemistry, and thermal properties of micron range particles and coarse particles prepared by superfine grinding and shear pulverization were investigated...
September 13, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28900767/quantitative-assessment-of-muscular-stiffness-in-children-with-cerebral-palsy-using-acoustic-radiation-force-impulse-arfi-ultrasound-elastography
#7
Meltem Ceyhan Bilgici, Tumay Bekci, Yasemin Ulus, Hamit Ozyurek, Omer Faruk Aydin, Leman Tomak, Mustafa Bekir Selcuk
PURPOSE: To evaluate the feasibility of quantitative analysis of muscle stiffness in the medial gastrocnemius muscle (GCM) by acoustic radiation force impulse (ARFI) ultrasound elastography in children with spastic cerebral palsy (CP). METHODS: Seventeen children with spastic CP and 25 healthy children participated in the study between the years 2016-2017. The medial GCM in the CP group was assessed using the Modified Ashworth Scale (MAS) by a physiatrist. ARFI was used to measure the shear-wave velocities (SWVs) of the medial GCM...
September 12, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28900566/transversus-abdominis-elasticity-during-various-exercises-a-shear-wave-ultrasound-elastography-study
#8
Kuniaki Hirayama, Ryota Akagi, Yuki Moniwa, Junichi Okada, Hideyuki Takahashi
BACKGROUND: Although the transversus abdominis (TrA) is considered to play a significant role in maintaining trunk stability, there is little information regarding the type of exercise that best facilitates the development of tension in the TrA. Muscle elasticity shows a strong association with muscle tension. Shear wave ultrasound elastography provides a means by which the tension of TrA can be noninvasively estimated, by quantifying it's elasticity. PURPOSE: The purpose of this study was to examine the TrA elasticity during several exercises as measured by shear wave ultrasound elastography, and to determine which of the studied exercises demonstrated the greatest tension...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900529/high-resolution-ultrasonography-and-shear-wave-sonoelastography-of-a-cystic-radial-nerve-schwannoma
#9
Patrick J Battaglia, Vivian Carbone-Hobbs, Gary M Guebert, Susan E Mackinnon, Norman W Kettner
Peripheral nerve tumors are often evaluated with magnetic resonance imaging (MRI), although there are many advantages offered with high-resolution ultrasonography (HRUS). This case report emphasizes the value of HRUS in the diagnosis and management of a patient with a cystic radial nerve Schwannoma. In addition, information on tumor stiffness, obtained with shear-wave sonoelastography (SWE), is presented.
September 2017: Journal of Ultrasound
https://www.readbyqxmd.com/read/28900522/point-shear-wave-ultrasound-elastography-with-esaote-compared-to-real-time-2d-shear-wave-elastography-with-supersonic-imagine-for-the-quantification-of-liver-stiffness
#10
L Mulazzani, V Salvatore, F Ravaioli, G Allegretti, F Matassoni, R Granata, A Ferrarini, H Stefanescu, Fabio Piscaglia
PURPOSE: Different shear wave elastography (SWE) machines able to quantify liver stiffness (LS) have been recently introduced by various companies. The aim of this study was to investigate the agreement between point SWE with Esaote MyLab Twice (pSWE.ESA) and 2D SWE with Aixplorer SuperSonic (2D SWE.SSI). Moreover, we assessed the correlation of these machines with Fibroscan in a subgroup of patients. METHODS: A total of 81 liver disease patients and 27 subjects without liver disease accessing the ultrasound lab were considered...
September 2017: Journal of Ultrasound
https://www.readbyqxmd.com/read/28899126/impact-of-region-of-interest-roi-size-on-the-diagnostic-performance-of-shear-wave-elastography-in-differentiating-solid-breast-lesions
#11
Jin Hee Moon, Ji-Young Hwang, Jeong Seon Park, Sung Hye Koh, Sun-Young Park
Background Shear wave elastography (SWE) using a region of interest (ROI) can demonstrate the quantitative elasticity of breast lesions. Purpose To prospectively evaluate the impact of two different ROI sizes on the diagnostic performance of SWE for differentiating benign and malignant breast lesions. Material and Methods A total of 154 breast lesions were included. Two types of ROIs were investigated: one involving an approximately 2-mm diameter, small round ROIs placed over the stiffest area of the lesion, as determined by SWE (ROI-S); and another ROI drawn along the margin of the lesion using a touch pen or track ball to encompass the entire lesion (ROI-M)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28891995/performance-study-of-a-torsional-wave-sensor-and-cervical-tissue-characterization
#12
Antonio Callejas, Antonio Gomez, Juan Melchor, Miguel Riveiro, Paloma Massó, Jorge Torres, Modesto T López-López, Guillermo Rus
A novel torsional wave sensor designed to characterize mechanical properties of soft tissues is presented in this work. Elastography is a widely used technique since the 1990s to map tissue stiffness. Moreover, quantitative elastography uses the velocity of shear waves to achieve the shear stiffness. This technique exhibits significant limitations caused by the difficulty of the separation between longitudinal and shear waves and the pressure applied while measuring. To overcome these drawbacks, the proposed torsional wave sensor can isolate a pure shear wave, avoiding the possibility of multiple wave interference...
September 11, 2017: Sensors
https://www.readbyqxmd.com/read/28885209/investigation-of-the-acute-plantar-fasciitis-with-contrast-enhanced-ultrasound-and-shear-wave-elastography-first-results
#13
Franz Josef Putz, Matthias G Hautmann, Miriam Banas, Ernst Michael Jung
BACKGROUND: The plantar fasciitis is a common disease with a high prevalence in public and a frequent cause of heel pain. OBJECTIVE: In our pilot study, we wanted to characterise the feasibility of shear-wave elastography and contrast-enhanced ultrasound (CEUS) in the assessment of the plantar fasciitis. METHODS: 23 cases of painful heels were examined by B-Mode ultrasound, Power Doppler (PD), shear wave elastography and contrast-enhanced ultrasound before anti-inflammatory radiation...
September 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28885153/three-dimensional-single-track-location-shear-wave-elasticity-imaging-stl-swei
#14
Peter Hollender, Samantha Lipman, Gregg Trahey
Conventional multiple track location shear wave elasticity imaging (MTL-SWEI) is a powerful tool for noninvasively estimating tissue elasticity. The resolution and noise levels of MTL-SWEI systems, however, are limited by ultrasound speckle. Single track location SWEI (STL-SWEI) is a novel variant which fixes the position of the tracking beam and modulates the push location to effectively cancel out the effects of speckle-induced bias. We present here a three-dimensional STL-SWEI system which provides full suppression of lateral and elevation speckle bias for high resolution volumetric elasticity imaging, and requires no spatial smoothing to make accurate measurements of shear wave speed...
September 6, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28882058/role-of-acoustic-radiation-force-impulse-and-shear-wave-velocity-in-prediction-of-preterm-birth-a-prospective-study
#15
Arjit Agarwal, Shubhra Agarwal, Shruti Chandak
Background Preterm birth is one of the important causes of neonatal morbidity where we rely on subjective criteria such as modified Bishop's scoring and contemporary sonographic measurement of cervical length. Acoustic radiation force impulse (ARFI) is a technological advancement in elastography that can be employed in prediction of cervical softening and preterm labor. Purpose To evaluate the role of ARFI technique and shear wave velocity (SWV) estimates as a predictor of preterm birth and its comparison with other clinical and sono-elastographic measures...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28874748/erosion-potential-of-the-yangtze-delta-under-sediment-starvation-and-climate-change
#16
H F Yang, S L Yang, K H Xu, H Wu, B W Shi, Q Zhu, W X Zhang, Z Yang
Deltas are widely threatened by sediment starvation and climate change. Erosion potential is an important indicator of delta vulnerability. Here, we investigate the erosion potential of the Yangtze Delta. We found that over the past half century the Yangtze's sediment discharge has decreased by 80% due to the construction of >50,000 dams and soil conservation, whereas the wind speed and wave height in the delta region have increased by 5-7%, and the sea level has risen at a rate of 3 mm/yr. According to hydrodynamic measurements and analyses of seabed sediments, the period when bed shear stress due to combined current-wave action under normal weather conditions exceeds the critical bed shear stress for erosion (τ cr ) accounts for 63% of the total observed period on average and can reach 100% during peak storms...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28871805/acoustic-radiation-force-impulse-elastography-in-determining-the-effects-of-type-1-diabetes-on-pancreas-and-kidney-elasticity-in-children
#17
Dilek Sağlam, Meltem Ceyhan Bilgici, Cengiz Kara, Gülay Can Yılmaz, İlkay Çamlıdağ
OBJECTIVE: The aim of this study is to determine the effects of type 1 diabetes on pancreas and kidney elasticity in children, using acoustic radiation force impulse ultrasound elastography. SUBJECTS AND METHODS: Sixty autoantibody-positive patients with type 1 diabetes (45% girls; mean [± SD] age, 11.7 ± 4.4 years; range, 1.9-19.3 years) admitted to the pediatric endocrinology outpatient clinic and 32 healthy children (50% girls; mean age, 10.2 ± 3.8 years; range, 2...
September 5, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28871127/simultaneous-multi-band-valley-protected-topological-edge-states-of-shear-vertical-wave-in-two-dimensional-phononic-crystals-with-veins
#18
Shao-Yong Huo, Jiu-Jiu Chen, Hong-Bo Huang, Guo-Liang Huang
The introduction of the concept of valley pseudospin to phononic crystals has made a remarkable topologically protected interface transport of sound, which opens a novel research area referred to as valley Hall topological insulators. Here, we demonstrate the simultaneous multi-band edge states of shear vertical waves in two-dimensional phononic crystals with veins. The multi-band edge states are topologically valley-protected and are obtained by simultaneously gapping multiple Dirac points at K (or K') under the inversion symmetry breaking...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28869554/design-of-waveguide-bars-for-transmitting-a-pure-shear-horizontal-wave-to-monitor-high-temperature-components
#19
Jiuhong Jia, Qiyue Wang, Zuoyu Liao, Yun Tu, Shan-Tung Tu
Guided wave technique could be a possible method for monitoring components working in high temperature above 350 °C. However, this would require the design of an appropriate waveguide bar to transmit the wave, so that its sensing part is not influenced by the high temperature. In the present study, the shape of waveguide bars is designed based on the analysis of wave source characteristics. The critical frequency-width and frequency-thickness products of waveguide bars are analyzed theoretically and numerically to transmit the zeroth shear horizontal wave SH0* in bars...
September 4, 2017: Materials
https://www.readbyqxmd.com/read/28866442/passive-material-properties-of-stroke-impaired-plantarflexor-and-dorsiflexor-muscles
#20
Kristen L Jakubowski, Ada Terman, Ricardo V C Santana, Sabrina S M Lee
BACKGROUND: Following a stroke, intrinsic muscle properties such as stiffness may be altered, which is accompanied by increased spasticity and contractures. Previously, quantification of muscle stiffness has been based off of indirect measurements. Using shear wave ultrasound elastography, direct measurements of muscle material properties can be made. METHODS: Our aim was to evaluate material properties, specifically passive stiffness, using shear wave ultrasound elastography across a range of muscle lengths, in the medial gastrocnemius and the tibialis anterior in chronic stroke survivors...
August 24, 2017: Clinical Biomechanics
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