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https://www.readbyqxmd.com/read/28442120/american-gastroenterological-association-institute-technical-review-on-the-role-of-elastography-in-chronic-liver-diseases
#1
Siddharth Singh, Andrew J Muir, Douglas T Dieterich, Yngve T Falck-Ytter
Chronic liver diseases (CLDs), due to chronic hepatitis C; hepatitis B; nonalcoholic fatty liver diseases (NAFLD); and alcoholic liver disease, are a leading cause of morbidity and mortality globally. Early identification of patients with cirrhosis at high risk of progression to liver-related complications may facilitate timely care and improve outcomes. With risks and misclassification associated with invasive tests, such as liver biopsy, noninvasive imaging modalities for liver fibrosis assessment have gained popularity...
May 2017: Gastroenterology
https://www.readbyqxmd.com/read/28440353/the-safety-and-feasibility-of-diagnostic-acoustic-radiation-force-impulse-elastography-used-for-eyes-a-preliminary-in-vivo-study
#2
Li Zha, Ke Qi Chen, Xiao Zhi Zheng, Jing Wu
AIMS: To assess the safety and feasibility of acoustic radiation force impulse (ARFI) elastography in the eyes of rats. Material and methods: One hundred and twenty-six SD rats were divided into 7 groups. Group 1 was the control group and Group 2 to Group 7 were investigated by ARFI elastography using increased powers of 5%, 10%, 20%, 50%, and 100% and repetitions of 5 or 10. The changes of ocular architecture structures and functions were examined by phthalmoscopic, histopathologic, and light reflex examination, and the expression level of IL-6, IL-8, and TNF-α was determined in days 1, 3, and 7 after ARFI elastography, respectively...
April 22, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28440347/performance-of-2d-swe-ge-for-predicting-different-stages-of-liver-fibrosis-using-transient-elastography-as-the-reference-method
#3
Felix Bende, Ioan Sporea, Roxana Sirli, Alina Popescu, Ruxandra Mare, Bogdan Miutescu, Raluca Lupusoru, Tudor Moga, Corina Pienar
AIM: To evaluate the performance of 2D shear-wave elastography from General Electric (2D-SWE.GE) for the noninvasiveassessment of liver fibrosis and to identify liver stiffness (LS) cut-off values for predicting different stages of fibrosisusing Transient Elastography (TE) as the reference method. MATERIAL AND METHOD: We included 331 consecutive subjectswith or without chronic hepatopathies in whom LS was evaluated in the same session by means of 2 elastographic techniques:TE and 2D-SWE...
April 22, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28436592/diagnostic-value-of-virtual-touch-tissue-imaging-quantification-for-evaluating-median-nerve-stiffness-in-carpal-tunnel-syndrome
#4
Chen Zhang, Miao Li, Jue Jiang, Qi Zhou, Li Xiang, Yajuan Huang, Wenrui Ban, Wei Peng
OBJECTIVES: To measure the shear wave velocity (SWV) of the median nerve by Virtual Touch tissue imaging quantification (VTIQ; Siemens AG, Erlangen, Germany) through the beginning of the carpal tunnel and to determine whether VTIQ could be used to diagnose carpal tunnel syndrome. METHODS: This study recruited 49 consecutive patients (72 wrists) with a definitive diagnosis of carpal tunnel syndrome and 23 healthy volunteers (46 wrists). We measured the median nerve diameter and cross-sectional area by 2-dimensional sonography and the SWV by VTIQ...
April 24, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28435467/ultrasound-elastography-review-of-techniques-and-clinical-applications
#5
REVIEW
Rosa M S Sigrist, Joy Liau, Ahmed El Kaffas, Maria Cristina Chammas, Juergen K Willmann
Elastography-based imaging techniques have received substantial attention in recent years for non-invasive assessment of tissue mechanical properties. These techniques take advantage of changed soft tissue elasticity in various pathologies to yield qualitative and quantitative information that can be used for diagnostic purposes. Measurements are acquired in specialized imaging modes that can detect tissue stiffness in response to an applied mechanical force (compression or shear wave). Ultrasound-based methods are of particular interest due to its many inherent advantages, such as wide availability including at the bedside and relatively low cost...
2017: Theranostics
https://www.readbyqxmd.com/read/28433441/role-of-contrast-enhanced-ultrasound-in-diagnosis-of-thyroid-nodules-in-acoustic-radiation-force-impulse-gray-zone
#6
Jia Zhan, Xue-Hong Diao, Lin Chen, Jia-Mei Jin, Yue Chen
The aim of this study was to evaluate the clinical value of contrast-enhanced ultrasound (CEUS) in the diagnosis of thyroid nodules in the acoustic radiation force impulse (ARFI) "gray zone" (the shear wave velocity is in the range 2.5-3 m/s). ARFI was performed before thyroidectomy in 70 patients with 200 thyroid nodules, and then CEUS was performed in 40 thyroid nodules in the "gray zone." The accuracy of ARFI for the 200 thyroid nodules was 82% (164/200). The accuracy of ARFI for the 40 "gray zone" thyroid nodules was 70% (28/40), whereas the accuracy of CEUS for the "gray zone" thyroid nodules was 90% (36/40)...
April 19, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28431795/shear-wave-liver-elastography-with-a-propagation-map-diagnostic-performance-and-inter-observer-correlation-for-hepatic-fibrosis-in-chronic-hepatitis
#7
Eun Sun Lee, Jong Beum Lee, Hwi Ryong Park, Jeongin Yoo, Ji In Choi, Hyun Woong Lee, Hyung Joon Kim, Byung Ihn Choi, Hyun Jeong Park, Sung Bin Park
The aim of this study was to determine the performance of shear wave elastography (SWE) with a propagation map in the diagnosis of hepatic fibrosis, and to assess its reliability with transient elastography (TE) as the reference standard. Our prospective study included 115 consecutive patients with suspected or alleged chronic hepatitis. Patients underwent SWE by two different operators and TE by sonographers on the same day. The correlation coefficient of the intra-class correlation test between an experienced radiologist and a third-year radiology resident was 0...
April 18, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28428826/the-reliability-of-shear-elastic-modulus-measurement-of-the-ankle-plantar-flexion-muscles-is-higher-at-dorsiflexed-position-of-the-ankle
#8
Junya Saeki, Tome Ikezoe, Masatoshi Nakamura, Satoru Nishishita, Noriaki Ichihashi
BACKGROUND: Excessive stiffness of lower limb muscles is associated with sports injuries. Therefore, the identification of a reliable measurement of the shear elastic modulus of various ankle plantar flexion muscles is required to evaluate lower leg sports injuries. This study investigated the reliable measurement of the shear elastic modulus of the ankle plantar flexion muscles at different ankle positions. METHODS: Twenty-three healthy young men (25.3 ± 3...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/28427015/apparent-anisotropy-of-adhesive-bonds-with-weak-adhesion-and-non-destructive-evaluation-of-interfacial-properties
#9
Emmanuel Siryabe, Mathieu Rénier, Anissa Meziane, Jocelyne Galy, Michel Castaings
The present research attempts to non-destructively characterize mechanical properties, which are representative of the interfacial adhesion and bond line cohesion of adhesively bonded assemblies, using an ultrasonic method. Eight bonded samples made of two aluminium substrates and of an epoxy-based adhesive layer were manufactured: four in which the adhesive is fully cured (100%) and four in which crosslinking is partial (80%). For each level of curing, four different surface treatments were applied to the aluminium substrates before assembling, in order to vary the quality of adhesion...
April 9, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28426437/supersonic-transient-magnetic-resonance-elastography-for-quantitative-assessment-of-tissue-elasticity
#10
Yu Liu, Jingfei Liu, Brett Z Fite, Josquin Foiret, Asaf Ilovitsh, J Kent Leach, Erik Dumont, Charles F Caskey, Katherine W Ferrara
Non-invasive, quantitative methods to assess the properties of biological tissues are needed for many therapeutic and tissue engineering applications. Magnetic resonance elastography (MRE) has historically relied on external vibration to generate periodic shear waves. In order to focally assess a biomaterial or to monitor the response to ablative therapy, the interrogation of a specific region of interest by a focused beam is desirable and transient MRE (t-MRE) techniques have previously been developed to accomplish this goal...
April 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28424923/shear-wave-velocity-of-the-healthy-thyroid-gland-in-children-with-acoustic-radiation-force-impulse-elastography
#11
Meltem Ceyhan Bilgici, Dilek Sağlam, Semra Delibalta, Serap Yücel, Leman Tomak, Muzaffer Elmalı
PURPOSE: Acoustic radiation force impulse imaging is a kind of shear wave elastography that can be used in children for differentiating thyroid pathologies. Possible changes in the healthy thyroid gland in children may create difficulties in the use of shear wave velocities (SWV) in thyroid pathologies. The aim of this study was to define the normal values of SWV for the healthy thyroid gland in children, elucidate the correlation of the SWV values with potential influencing factors, and evaluate intra-operator reproducibility of the SWV...
April 19, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28417472/evaluation-of-liver-kidney-and-spleen-elasticity-in-healthy-newborns-and-infants-using-shear-wave-elastography
#12
Figen Bakirtas Palabiyik, Ercan Inci, Rustu Turkay, Derya Bas
OBJECTIVES: Elasticity measurements of tissues can be valuable in the diagnosis and management of various diseases. The aim of this study was to determine the elasticity values for normal liver, kidney, and spleen of healthy newborns and infants using shear wave elastography (SWE) imaging. METHODS: A total of 50 healthy term newborns and infants (19 girls and 31 boys; mean age 20.1 days, range 1 to 70 days) were examined by an experienced pediatric radiologist using SWE...
April 18, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28416925/shear-wave-sonoelastography-findings-of-testicles-in-chronic-kidney-disease-patients-who-undergo-hemodialysis
#13
Azad Hekimoglu, Idil Gunes Tatar, Onur Ergun, Aynur Turan, Mehmet Deniz Aylı, Baki Hekimoglu
OBJECTIVE: Chronic kidney disease (CKD) is known to cause significant deterioration in the function of the testicles and sexual dysfunction in male patients who undergo hemodialysis. The aim of this study was to show the changes in the testicles that occur as a result of hypogonadism secondary to CKD and to analyze the elasticity of the parenchyma by shear wave sonoelastography. MATERIALS AND METHODS: In our study we included 28 male patients who undergo dialysis three times per week and 25 healthy volunteers...
February 2017: Eurasian Journal of Medicine
https://www.readbyqxmd.com/read/28416793/seismic-anisotropy-of-the-d%C3%A2-layer-induced-by-001-deformation-of-post-perovskite
#14
Xiang Wu, Jung-Fu Lin, Pamela Kaercher, Zhu Mao, Jin Liu, Hans-Rudolf Wenk, Vitali B Prakapenka
Crystallographic preferred orientation (CPO) of post-perovskite (Mg,Fe)SiO3 (pPv) has been believed to be one potential source of the seismic anisotropic layer at the bottom of the lower mantle (D″ layer). However, the natural CPO of pPv remains ambiguous in the D″ layer. Here we have carried out the deformation experiments of pPv-(Mg0.75,Fe0.25)SiO3 using synchrotron radial X-ray diffraction in a membrane-driven laser-heated diamond anvil cell from 135 GPa and 2,500 K to 154 GPa and 3,000 K. Our results show that the intrinsic texture of pPv-(Mg0...
April 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28415376/streamwise-localization-of-traveling-wave-solutions-in-channel-flow
#15
Joshua Barnett, Daniel R Gurevich, Roman O Grigoriev
Channel flow of an incompressible fluid at Reynolds numbers above 2400 possesses a number of different spatially localized solutions that approach laminar flow far upstream and downstream. We use one such relative time-periodic solution, which corresponds to a spatially localized version of a Tollmien-Schlichting wave, to illustrate how the upstream and downstream asymptotics can be computed analytically. In particular, we show that for these spanwise uniform states the asymptotics predict the exponential localization that has been observed for numerically computed solutions of several canonical shear flows but never properly understood theoretically...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415122/p1138cardiac-shear-wave-velocity-in-healthy-individuals
#16
M Strachinaru, M L Geleijnse, J G Bosch, N De Jong, Afw Van Der Steen, B M Van Dalen, H J Vos
Background: The closure of the valves generates shear waves in the heart walls. The propagation velocity of shear waves relates to stiffness. This could potentially be used to estimate the stiffness of the myocardium, with huge potential implications in pathologies characterized by a deterioration of the diastolic properties of the left ventricle. In an earlier phantom study we already validated shear wave tracking with a clinical ultrasound system in cardiac mode. Purpose: In this study we aimed to measure the shear waves velocity in normal individuals...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28414822/2-dimensional-shear-wave-elastography-interobserver-agreement-and-factors-related-to-interobserver-discrepancy
#17
Kibo Yoon, Woo Kyoung Jeong, Yongsoo Kim, Min Yeong Kim, Tae Yeob Kim, Joo Hyun Sohn
PURPOSE: To evaluate the interobserver reproducibility of two-dimensional shear wave elastography (2D-SWE) in measuring liver stiffness (LS) and to investigate factors related to liver 2D-SWE. MATERIALS AND METHODS: A prospective study was conducted between August 2011 and August 2012 in rheumatoid arthritis patients who had been treated with methotrexate. Interobserver reproducibility of 2D-SWE was evaluated, and the relationship between interobserver difference in LS and related factors was analyzed using linear regression analyses...
2017: PloS One
https://www.readbyqxmd.com/read/28414379/efficient-acousto-optic-crystal-tlins-sub-2-sub-acoustic-and-elastic-anisotropy
#18
I Martynyuk-Lototska, I Trach, O Kokhan, R Vlokh
We have studied experimentally the acoustic wave velocities for TlInS<sub>2</sub> crystals and determined all components of their elastic stiffness and compliance tensors. It has been found that TlInS<sub>2</sub> reveals small elastic anisotropy with respect to normal mechanical stresses. The compliance components S<sub>44</sub> and S<sub>55</sub> are very large, thus suggesting that the TlInS<sub>2</sub> crystals are extremely compliant to the shear stresses in the cleavage plane...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28410102/scanned-three-dimensional-intracardiac-arfi-and-swei-for-imaging-radiofrequency-ablation-lesions
#19
Peter Hollender, Lily Kuo, Virginia Chen, Stephanie Eyerly, Patrick Wolf, Gregg Trahey
Radiofrequency ablation (RFA) is used to locally disrupt electrical propagation in myocardium and treat arrhythmias, and direct visualization of ablation lesions by acoustic radiation force methods may benefit RFA procedures. This work compares four imaging modalities, B-Mode, ARFI, STL-SWEI and MTL-SWEI, in their ability to resolve RFA lesions in four ex vivo experiments. Ablation lesions are shown to be marked by at least a local halving of ARFI displacements and doubling of shear wave speeds. In a controlled ablation of ex vivo porcine and canine cardiac tissue, STL-SWEI and ARFI are shown to have similar CNR, better than MTL-SWEI and B-Mode...
April 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28408062/novel-method-for-vessel-cross-sectional-shear-wave-imaging
#20
Qiong He, Guo-Yang Li, Fu-Feng Lee, Qihao Zhang, Yanping Cao, Jianwen Luo
Many studies have investigated the applications of shear wave imaging (SWI) to vascular elastography, mainly on the longitudinal section of vessels. It is important to investigate SWI in the arterial cross section when evaluating anisotropy of the vessel wall or complete plaque composition. Here, we proposed a novel method based on the coordinate transformation and directional filter in the polar coordinate system to achieve vessel cross-sectional shear wave imaging. In particular, ultrasound radiofrequency data were transformed from the Cartesian to the polar coordinate system; the radial displacements were then estimated directly...
April 10, 2017: Ultrasound in Medicine & Biology
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