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Shear-Wave

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https://www.readbyqxmd.com/read/29150327/diagnostic-accuracy-of-point-shear-wave-elastography-in-the-detection-of-portal-hypertension-in-pediatric-patients
#1
M Burak Özkan, M C Bilgici, E Eren, G Caltepe
PURPOSE: The purpose of this study was to determine the usefulness of point shear wave elastography (p-SWE) of the liver and spleen for the detection of portal hypertension in pediatric patients. MATERIALS AND METHODS: The study consisted of 38 healthy children and 56 pediatric patients with biopsy-proven liver disease who underwent splenic and liver p-SWE. The diagnostic performance of p-SWE in detecting clinically significant portal hypertension was assessed using receiver operating characteristic (ROC) curves...
November 14, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/29147849/heterogeneity-of-passive-elastic-properties-within-the-quadriceps-femoris-muscle-tendon-unit
#2
Brooke K Coombes, Brandon Ziegenfuss, Michael David, Rohitha Badya, Wolbert van den Hoorn, François Hug, Kylie Tucker
PURPOSE: The purpose of this study was to compare regional elastic properties between anterior and posterior regions of the patellar tendon, and individual quadriceps muscles, over a range of knee flexion angles. METHODS: An isokinetic dynamometer passively positioned the non-dominant knee of 19 young, healthy participants, at 25°, 40°, 55°, 70° and 85° flexion. Shear wave velocity (SWV, an index of tissue elasticity) was measured using ultrasound shear wave elastography in a relaxed (passive) state, confirmed by electromyography...
November 17, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29147741/achilles-tendon-elastic-properties-remain-decreased-in-long-term-after-rupture
#3
B Frankewycz, A Penz, J Weber, N P da Silva, F Freimoser, R Bell, M Nerlich, E M Jung, D Docheva, C G Pfeifer
PURPOSE: Rupture of the Achilles tendon results in inferior scar tissue formation. Elastography allows a feasible in vivo investigation of biomechanical properties of the Achilles tendon. The purpose of this study is to investigate the biomechanical properties of healed Achilles tendons in the long term. MATERIALS AND METHODS: Patients who suffered from Achilles tendon rupture were recruited for an elastographic evaluation. Unilateral Achilles tendon ruptures were included and scanned in the mid-substance and calcaneal insertion at least 2 years after rupture using shear wave elastography...
November 16, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29144159/shear-wave-elastography-quantitative-assessment-of-the-male-breast-added-value-to-distinguish-benign-and-malignant-palpable-masses
#4
Amandine Crombe, Gabrielle Hurtevent-Labrot, Maryam Asad-Syed, Jean Palussiere, Gaetan MacGrogan, Michèle Kind, Stéphane Ferron
OBJECTIVE: To evaluate the ability of shear-wave elastography (SWE) to distinguish between benign and malignant palpable masses of the adult male breast. METHODS: Clinical examination, mammography, B-mode and Doppler ultrasound (US) findings and SWE quantitative parameters were compared in 50 benign lesions (including 40 gynecomastias) and 15 malignant lesions (invasive ductal carcinomas) from 65 patients who were consecutively addressed for specialized advice at our comprehensive cancer center...
November 16, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29143363/utility-of-shear-wave-elastography-for-assessing-allograft-fibrosis-in-renal-transplant-recipients-a-pilot-study
#5
Heather M Early, Ellen C Cheang, Jorge M Aguilera, Jonah S W Hirschbein, Ghaneh Fananapazir, Machelle D Wilson, John P McGahan
OBJECTIVES: To evaluate the utility of ultrasound-based shear wave elastography (SWE) as a noninvasive method to accurately detect and potentially stage the severity of renal allograft fibrosis and assess its user reproducibility. METHODS: In this Institutional Review Board-approved, Health Insurance Portability and Accountability Act-compliant prospective study, 70 renal transplant recipients underwent an SWE evaluation of their allograft followed directly by biopsy...
November 16, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29141415/contribution-to-viscosity-from-the-structural-relaxation-via-the-atomic-scale-green-kubo-stress-correlation-function
#6
V A Levashov
We studied the connection between the structural relaxation and viscosity for a binary model of repulsive particles in the supercooled liquid regime. The used approach is based on the decomposition of the macroscopic Green-Kubo stress correlation function into the correlation functions between the atomic level stresses. Previously we used the approach to study an iron-like single component system of particles. The role of vibrational motion has been addressed through the demonstration of the relationship between viscosity and the shear waves propagating over large distances...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29139316/association-of-gastrocnemius-muscle-stiffness-with-passive-ankle-joint-stiffness-and-sex-related-difference-in-the-joint-stiffness
#7
Kintaro Chino, Hideyuki Takashi
Passive ankle joint stiffness is affected by all structures located within and over the joint, and is greater in men than in women. Localized muscle stiffness can be assessed by ultrasound shear wave elastography, and muscle architecture such as fascicle length and pennation angle can be measured by B-mode ultrasonography. Thus, we assessed localized muscle stiffness of the medial gastrocnemius (MG) with consideration of individual variability in the muscle architecture, and examined the association of the muscle stiffness with passive ankle joint stiffness and the sex-related difference in the joint stiffness...
November 15, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29137729/the-shear-wave-elastic-modulus-and-the-increased-nuclear-factor-kappa-b-nf-kb-p65-and-cyclooxygenase-2-cox-2-expression-in-the-area-of-myofascial-trigger-points-activated-in-a-rat-model-by-blunt-trauma-to-the-vastus-medialis
#8
Hengyong Lv, Zhen Li, Tiantian Hu, Yuexiang Wang, Jinpeng Wu, Yingxin Li
We aimed to elucidate the increased inflammatory cytokines expression such as nuclear factor kappa B (NF-kB/p65), cyclooxygenase-2 (COX-2), and voltage-gated calcium channels (VGCC) in the area of activated myofascial trigger points (MTrPs) in a rat model by blunt trauma to the vastus medialis and to evaluate the feasibility of a quantitative analysis of muscle elastic modulus using shear wave elastography (SWE). Twelve 7-week-old male SD rats were divided into normal (NM, n = 6) and model groups (MO, n = 6)...
November 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29128938/liver-fibrosis-noninvasive-assessment-using-supersonic-shear-imaging-and-fib4-index-in-patients-with-non-alcoholic-fatty-liver-disease
#9
Hirohito Takeuchi, Katsutoshi Sugimoto, Hisashi Oshiro, Kunio Iwatsuka, Shin Kono, Yu Yoshimasu, Yoshitaka Kasai, Yoshihiro Furuichi, Kentaro Sakamaki, Takao Itoi
PURPOSE: Shear wave elastography (SWE) has been validated in chronic hepatitis C and B; however, limited data are available in non-alcoholic fatty liver disease (NAFLD). This study aimed to evaluate the accuracy of SWE and FIB4 index for the diagnosis of fibrosis in a cohort of consecutive patients with biopsy-proven NAFLD, and to evaluate the effects of other histologic parameters on SWE measurement. METHODS: Written informed consent was obtained from all patients, and this study was approved by our internal review board and ethics committee...
November 11, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29122316/diagnostic-accuracy-of-2-d-shear-wave-elastography-for-the-non-invasive-staging-of-liver-fibrosis-in-patients-with-elevated-alanine-aminotransferase-levels
#10
Jie Zeng, Zeping Huang, Jieyang Jin, Jian Zheng, Tao Wu, Rongqin Zheng
This study assessed the diagnostic accuracy of 2-D shear wave elastography (2-D-SWE) for the non-invasive staging of liver fibrosis and compared the findings with those for biochemical markers (the aspartate aminotransferase-to-platelet index and fibrosis-4 index) of liver fibrosis in patients with elevated alanine aminotransferase (ALT) levels (>5 × the upper limit of normal). Patients with chronic liver diseases and elevated ALT levels who underwent liver biopsy were consecutively included. Receiver operating characteristic (ROC) curves were constructed to assess overall accuracy and to identify optimal cutoff values...
November 6, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29116341/shear-wave-liver-elastography
#11
Richard G Barr
Chronic liver disease is a substantial world-wide problem. Its major consequence is increasing deposition of fibrous tissue within the liver leading to the development of cirrhosis with its consequences of portal hypertension, hepatic insufficiency, and hepatocellular carcinoma. The stage of liver fibrosis is important to determine prognosis, surveillance, prioritize for treatment, and potential for reversibility. The process of fibrosis is dynamic and regression of fibrosis is possible with treatment of the underlying conditions...
November 7, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/29112910/biomechanical-characterization-of-ex-vivo-human-brain-using-ultrasound-shear-wave-spectroscopy
#12
Emmanuel Nicolas, Samuel Callé, Stéphane Nicolle, David Mitton, Jean-Pierre Remenieras
The characterization of brain tissue is crucial to better understand neurological disorders. Mechanical characterization is an emerging tool in that field. The purpose of this work was to validate a transient ultrasound technique aimed at measuring dispersion of mechanical parameters of the brain tissue. The first part of this work was dedicated to the validation of that technique by comparing it with two proven rheology methods: a rotating plate rheometer, and a viscoelastic spectroscopy apparatus. Experiments were done on tissue mimicking gels...
November 4, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29096427/accurate-measurements-of-liver-stiffness-using-shear-wave-elastography-in-children-and-young-adults-and-the-role-of-the-stability-index
#13
Eun Kyoung Hong, Young Hun Choi, Jung-Eun Cheon, Woo Sun Kim, In-One Kim, Sun Young Kang
Purpose: The purpose of this study was to evaluate the usefulness of the stability index (SI) in liver stiffness measurements using shear wave elastography (SWE) in children. Methods: A total of 29 children and young adults (mean age, 16.1 years; range, 8 to 28 years; 11 boys and 18 girls) who underwent liver stiffness measurements using SWE under free-breathing and breath-holding conditions were included in our study. Ten SWE measurements were acquired in each of four groups: free-breathing and breath-holding, and with and without using the SI...
August 19, 2017: Ultrasonography
https://www.readbyqxmd.com/read/29092577/modified-error-in-constitutive-equations-mece-approach-for-ultrasound-elastography
#14
Susanta Ghosh, Zilong Zou, Olalekan Babaniyi, Wilkins Aquino, Manuel I Diaz, Mahdi Bayat, Mostafa Fatemi
A partial differential equation-constrained optimization approach is presented for reconstructing mechanical properties (e.g., elastic moduli). The proposed method is based on the minimization of an error in constitutive equations functional augmented with a least squares data misfit term referred to as MECE for "modified error in constitutive equations." The main theme of this paper is to demonstrate several key strengths of the proposed method on experimental data. In addition, some illustrative examples are provided where the proposed method is compared with a common shear wave elastography (SWE) approach...
October 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29092551/forward-and-inverse-viscoelastic-wave-scattering-by-irregular-inclusions-for-shear-wave-elastography
#15
Simon Bernard, Guy Cloutier
Inversion methods in shear wave elastography use simplifying assumptions to recover the mechanical properties of soft tissues. Consequently, these methods suffer from artifacts when applied to media containing strong stiffness contrasts, and do not provide a map of the viscosity. In this work, the shear wave field recorded inside and around an inclusion was used to estimate the viscoelastic properties of the inclusion and surrounding medium, based on an inverse problem approach assuming local homogeneity of both media...
October 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29091321/elastogram-quality-assessment-score-in-vibration-controlled-transient-elastography-diagnostic-performance-compared-to-digital-morphometric-analysis-of-liver-biopsy-in-chronic-hepatitis-c
#16
Leandro C Mendes, Paulo A Ferreira, Noelle Miotto, Letícia Zanaga, Eduardo S L Gonçales, Marcelo N Pedro, Maria S Lazarini, Fernando L G Júnior, Raquel S B Stucchi, Alive G Vigani
Vibration controlled transient elastography (VCTE) is widely used for non-invasive fibrosis staging in chronic hepatitis C. However, internal validation is based solely on variability and success rate and lack reproducible quality indicators. We analysed the graphic representation of shear wave propagation in comparison with morphometric results of liver biopsy liver biopsy, eliminating observer variability bias. Individual elastograms were classified according to two morphologic criteria: extension of wave propagation (length of the graphic representation) and shear wave dispersal (level of parallelism displayed in the elastogram)...
November 1, 2017: Journal of Viral Hepatitis
https://www.readbyqxmd.com/read/29089825/prospective-validation-of-intra-and-interobserver-reproducibility-of-a-new-point-shear-wave-elastographic-technique-for-assessing-liver-stiffness-in-patients-with-chronic-liver-disease
#17
Su Joa Ahn, Jeong Min Lee, Won Chang, Sang Min Lee, Hyo-Jin Kang, Hyunkyung Yang, Jeong Hee Yoon, Sae Jin Park, Joon Koo Han
OBJECTIVE: To assess intra- and inter-observer reproducibility of a new point shear wave elastography technique (pSWE, S-Shearwave, Samsung Medison) and compare its accuracy in assessing liver stiffness (LS) with an established pSWE technique (Virtual Touch Quantification, VTQ). MATERIALS AND METHODS: Thirty-three patients were enrolled in this Institutional Review Board-approved prospective study. LS values were measured by VTQ on an Acuson S2000 system (Siemens Healthineer) and S-Shearwave on an RS-80A (Samsung Medison) in the same session, followed by two further S-Shearwave sessions for inter- and intra-observer variation at 8-hour intervals...
November 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29081454/assessment-of-liver-fibrosis-by-ultrasound-elastography-and-contrast-enhanced-ultrasound-a-randomized-prospective-animal-study
#18
Tingting Qiu, Hong Wang, Jinzhen Song, Wenwu Ling, Yujun Shi, Gang Guo, Yan Luo
This study aimed to assess liver fibrosis by contrast-enhanced ultrasound (CEUS) and point shear-wave elastography (pSWE) in rabbits and compare the performance of the two techniques. Eighty rabbits were divided into experimental (n=60) and control group (n=20). In the experimental group, liver fibrosis (F1-F4) was induced by subcutaneous injection of carbon tetrachloride. CEUS and pSWE of the liver was performed for the two groups at a 4-week interval for 40 weeks. The portal vein rise time (PV-RT), time to peak (PV-TTP), mean transit time (PV-MTT) and the maximum signal intensity (PV-Imax) were analyzed with time-intensity curves (TICs)...
October 27, 2017: Experimental Animals
https://www.readbyqxmd.com/read/29077697/assessment-of-liver-fibrosis-using-real-time-shear-wave-elastography-for-patients-with-hepatitis-b-e-antigen-negative-chronic-hepatitis-b-and-alanine-transaminase-2-times-the-upper-limit-of-normal
#19
Jing-Hua Liu, Yu Zou, Wei Chang, Jun Wu, Yu Zou, Yu-Chen Xie, Yong-Ping Lu, Jia Wei
BACKGROUND: We assessed liver fibrosis using real-time shear-wave elastography (SWE) combined with liver biopsy (LB) for patients with hepatitis B e antigen (HBeAg)-negative chronic hepatitis B (CHB) and alanine transaminase < 2 times the upper limit of normal and hepatitis B virus DNA < 2000 IU/ml. METHODS: A total of 107 patients met the inclusion criteria. Real- ime SWE and ultrasoundassisted liver biopsies were consecutively performed. Fibrosis was staged according to the METAVIR scoring system...
September 2017: Revista de Investigación Clínica; Organo del Hospital de Enfermedades de la Nutrición
https://www.readbyqxmd.com/read/29075915/shear-wave-elastography-evaluation-in-pediatric-testicular-microlithiasis-a-comparative-study
#20
Zuhal Bayramoglu, Sedat Giray Kandemirli, Rana Gunoz Comert, Yunus Emre Akpinar, Emine Caliskan, Ravza Yilmaz, Tayfun Mevlut Oktar, Bilal Cetin, Mehmet Cingoz, Ibrahim Adaletli
PURPOSE: The aim of this study was to evaluate the testicular parenchyma in pediatric patients with testicular microlithiasis by shear wave elastography (SWE) and compare the values with normal control subjects. METHODS: Twenty-three patients previously diagnosed with testicular microlithiasis under follow-up for 20 ± 11 months were included in the study group. In the control group, 31 patients with no medical history that could affect testicular tissue were prospectively included...
October 26, 2017: Journal of Medical Ultrasonics
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