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Yasuhide Yoshitake, Daiki Uchida, Kosuke Hirata, Dean L Mayfield, Hiroaki Kanehisa
To confirm the existence of epimuscular myofascial force transmission in humans, this study examined if manipulating joint angle to stretch the muscle can alter the shear modulus of a resting adjacent muscle, and whether there are regional differences in this response. The biceps brachii (BB: manipulated muscle) and the brachialis (BRA: resting adjacent muscle) were deemed suitable for this study because they are neighboring, yet have independent tendons that insert onto different bones. In order to manipulate the muscle length of BB only, the forearm was passively set at supination, neutral, and pronation positions...
May 3, 2018: Journal of Biomechanics
Xinping Ren, Shujun Xia, Zhongxin Ni, Weiwei Zhan, Jianqiao Zhou
BACKGROUND: Evaluation of liver fibrosis is important to assess prognosis and guide the treatment for chronic hepatitis B. OBJECTIVE: To analyze and compare transient, point, and two-dimensional (2D) shear wave elastography techniques in grading the liver fibrosis. METHODS: Based on the severity of liver inflammation and fibrosis (Scheuer criteria), 158 patients with chronic hepatitis B were assigned into group 1 (either G or S classification < 2) or group 2 (either G or S classification ≥ 2)...
May 17, 2018: La Radiologia Medica
Erwei Nie, Jiao Yu, Debaditya Dutta, Yanying Zhu
BACKGROUND: Liver trauma is an important source of morbidity and mortality worldwide. A timely detection and precise evaluation of traumatic liver injury and the bleeding site is necessary. There is a need to develop better imaging modalities of hepatic injuries to increase the sensitivity of ultrasonic imaging techniques for sites of hemorrhage caused by cracks. In this study, we conduct an in silico simulation of liver crack detection and delineation using an ultrasonic shear wave imaging (USWI) based method...
May 16, 2018: BMC Medical Imaging
Cho-Chiang Shih, Pei-Yu Chen, Teng Ma, Qifa Zhou, K Kirk Shung, Chih-Chung Huang
The ability to measure the elastic properties of plaques and vessels would be useful in clinical diagnoses, particularly for detecting a vulnerable plaque. This study demonstrates the feasibility of the combination of intravascular ultrasound (IVUS) and acoustic radiation force elasticity imaging for detecting the distribution of stiffness within atherosclerotic arteries ex vivo . A dual-frequency IVUS transducer with two elements was used to induce the propagation of the shear wave (by the 8.5 MHz pushing element) which could be simultaneously monitored by the 31 MHz imaging element...
April 2018: Royal Society Open Science
Jiang Zhu, Junxiao Yu, Yueqiao Qu, Youmin He, Yan Li, Qiang Yang, Tiancheng Huo, Xingdao He, Zhongping Chen
Optical coherence elastography (OCE) is an emerging imaging modality for the assessment of mechanical properties in soft tissues. Transverse shear wave measurements using OCE can quantify the elastic moduli perpendicular to the force direction, however, missing the elastic information along the force direction. In this study, we developed coaxial excitation longitudinal shear wave measurements for quantification of elastic moduli along the force direction using M-scans. Incorporating Rayleigh wave measurements using non-coaxial lateral scans into longitudinal shear wave measurements, directionally dependent elastic properties can be quantified along the force direction and perpendicular to the force direction...
May 15, 2018: Optics Letters
Changtian Li, Manish Dhyani, Atul K Bhan, Joseph R Grajo, Daniel S Pratt, Michael S Gee, Anthony E Samir
OBJECTIVES: To assess performance of shear wave elastography for evaluation of fibrosis and the histologic stage in patients with autoimmune liver disease (ALD) and to validate previously established advanced fibrosis cutoff values in this cohort. METHODS: Shear wave elastography was performed on patients with ALD with an Aixplorer ultrasound system (SuperSonic Imagine, Aix-en-Provence, France) using an SC6-1 transducer. The median estimated tissue Young modulus was calculated from sets of 8 to 10 elastograms...
May 15, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Cheng Wei, Magdalena Szewczyk-Bieda, Paddy Nibblok, E Brown, Stephen Lang, Ghulam Nabi
BACKGROUND: To evaluate pre-surgical quantitative transrectal shear wave elastography (SWE) in the detection and characterisation of radioresistant prostate cancer. METHODS: Twelve men with recurrent prostate cancer following external beam radiotherapy were included in a prospective protocol-driven study. All underwent MR imaging and quantitative shear wave elastographic assessment of recurrent disease prior to salvage laparoscopic radical prostatectomy procedures...
May 14, 2018: Surgical Endoscopy
Peng Xie, Mengke Wang, Yanrong Guo, Huiying Wen, Xin Chen, Siping Chen, Haoming Lin
During the past two decades, tissue elasticity has been extensively studied and has been used in clinical disease diagnosis. But biological soft tissues are viscoelastic in nature. Therefore, they should be simultaneously characterized in terms of elasticity and viscosity. In addition, the mechanical properties of soft tissues are temperature dependent. However, how the temperature influences the shear wave dispersion and the viscoelasticity of soft tissue are still unclear. The aim of this study is to compare viscoelasticity of fat emulsion phantom with different temperature using acoustic radiation force elasticity imaging method...
April 27, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
Rik Noorlandt, Pauline P Kruiver, Marco P E de Kleine, Marios Karaoulis, Ger de Lange, Antonio Di Matteo, Julius von Ketelhodt, Elmer Ruigrok, Benjamin Edwards, Adrian Rodriguez-Marek, Julian J Bommer, Jan van Elk, Dirk Doornhof
The seismic hazard and risk analysis for the onshore Groningen gas field requires information about local soil properties, in particular shear-wave velocity ( V S ). A fieldwork campaign was conducted at 18 surface accelerograph stations of the monitoring network. The subsurface in the region consists of unconsolidated sediments and is heterogeneous in composition and properties. A range of different methods was applied to acquire in situ V S values to a target depth of at least 30 m. The techniques include seismic cone penetration tests (SCPT) with varying source offsets, multichannel analysis of surface waves (MASW) on Rayleigh waves with different processing approaches, microtremor array, cross-hole tomography and suspension P-S logging...
2018: Journal of Seismology
Jerome Boursier, Christophe Cassinotto, Gilles Hunault, Sarah Shili, Jerome Lebigot, Bruno Lapuyade, Adrien Lannes, Jean-Baptiste Hiriart, Victoire Cartier, Brigitte Le Bail, Sophie Michalak, Amaury Mouries, Frederic Oberti, Faiza Chermak, Isabelle Fouchard-Hubert, Paul Cales, Christophe Aube, Victor de Ledinghen
BACKGROUND & AIMS: Virtual Touch Quantification (VTQ) evaluates liver fibrosis in patients with chronic liver diseases by measuring shear wave speed in the liver. We aimed to determine the reliability criteria of VTQ examination. METHODS: We performed a prospective study of 1094 patients with chronic liver disease from November 2009 through October 2016 at Angers University Hospital, and between April 2010 and May 2015 at Bordeaux University Hospital, in France...
May 9, 2018: Clinical Gastroenterology and Hepatology
Eun Jee Song, Yu-Mee Sohn, Mirinae Seo
PURPOSE: To investigate the most effective cutoff values for shear-wave elastography (SWE) for differentiating benign and malignant breast lesions and to evaluate the diagnostic performance of quantitative and qualitative SWE in combination with B-mode ultrasound (US). METHODS: 209 breast lesions from 200 patients were evaluated with B-mode US and SWE. Pathologic results determined by US-guided core needle biopsy or surgical excisions were used as a reference standard...
May 4, 2018: Clinical Imaging
Yuri M Costa, Yoshiko Ariji, Dyna Mara A O Ferreira, Leonardo R Bonjardim, Paulo César R Conti, Eiichiro Ariji, Peter Svensson
BACKGROUND: The impression of increased muscle hardness in painful muscles is commonly reported in the clinical practice but may be difficult to assess. Therefore, the aim of this review is to present and discuss relevant aspects regarding the assessment of muscle hardness and its association with myofascial temporomandibular disorder (TMD) pain. METHODS: A non-systematic search for studies of muscle hardness assessment in patients with pain-related TMDs was carried out in PubMed, Cochrane Library, Embase and Google Scholar...
May 10, 2018: Journal of Oral Rehabilitation
Pamela Zengel, Florian Notter, Dirk Andre Clevert
OBJECTIVES: Ultrasound is the method of choice for preoperative evaluation of tumors of the parotid glands. However, existing methods do not allow for clear differentiation between the most common benign tumors and malignant tumors. The aim of our study was to evaluate if acoustic radiation force, Virtual Touch Quantification (VTQ) elastography helps to improve the preoperative evaluation of parotid masses. METHODS: We investigated the parenchyma of 102 parotid glands, fourteen lymph nodes of healthy volunteers and 51 tumors of the parotid gland via ultrasound, color Doppler ultrasound and VTQ...
May 10, 2018: Dento Maxillo Facial Radiology
Jonas Wakker, Wolfgang Kratzer, Tilmann Graeter, Julian Schmidberger
BACKGROUND: To determine normal values for acoustic radiation force impulse (ARFI) shear wave elastography of the Achilles tendon. METHODS: Using the VTIQ mode with the Acuson S3000™ (Siemens Healthcare, Erlangen, Germany), we measured the shear wave velocity (SWV) in m/s and the diameter in mm of both Achilles tendons in 182 healthy volunteers. The tendon was displayed in a sagittal view with a relaxed tendon. The parameters were tested for correlations with the anthropometric data of the subjects, between the genders and different age groups, as well as information obtained from the history, such as smoking and sporting activities...
May 9, 2018: BMC Musculoskeletal Disorders
M Bilasse, S Chatelin, G Altmeyer, A Marouf, J Vappou, I Charpentier
Dynamic elastography is a virtual palpation tool that aims at investigating the mechanical response of biological soft tissues in vivo. The objective of this study is to develop a finite element model (FEM) with low computational cost for reproducing realistically wave propagation for magnetic resonance elastography (MRE) in heterogeneous soft tissues. Based on the first-order shear deformation theory (FSDT) for moderately thick structures, this model is developed and validated through comparison with analytical formulations of wave propagating in heterogeneous, viscoelastic infinite medium...
May 8, 2018: International Journal for Numerical Methods in Biomedical Engineering
Pavel Taimr, Anne Julia Klompenhouwer, Maarten G J Thomeer, Bettina E Hansen, Jan N M Ijzermans, Robert A de Man, Robert J de Knegt
PURPOSE: Focal nodular hyperplasia (FNH) and hepatocellular adenoma (HCA) are liver tumors that require different management. We assessed the potential of point shear wave elastography (pSWE) to differentiate FNH from HCA and the interobserver and intraobserver reliability of pSWE in the examination of these lesions and of native liver tissue (NLT). METHODS: The study included 88 patients (65 FNH, 23 HCA). pSWE was performed by two experienced liver sonographers (observers 1 [O1] and 2 [O2]) and acquired within the lesion of interest and NLT...
May 8, 2018: Journal of Clinical Ultrasound: JCU
Li-Ting Xie, Dan-Xia Xu, Guo Tian, Li-Yun Zhong, Qi-Yu Zhao, Qing-Hong Ke, Tian-An Jiang
BACKGROUND: To date, liver congestion is one of the most significant clinical diseases. However, few studies have profoundly investigated the development, pathology, and prognosis of the important problems associated with acute hepatic congestion. AIMS: To explore the value of noninvasive two-dimensional shear wave elastography (2D-SWE) for assessing acute liver congestion in an animal model. METHODS: Six healthy Bama mini-pigs were used for this research and randomly divided into the experimental group and control group...
May 8, 2018: Digestive Diseases and Sciences
Marie Byenfeldt, Anders Elvin, Per Fransson
The aim of the study was to investigate patient-related factors associated with either reliable or poorly reliable measurement results of ultrasound-based shear wave elastography (SWE) of the liver. A total of 188 patients were analyzed prospectively with binary logistic regression using the interquartile range/median as cutoff to define two groups based on reliable and poorly reliable SWE results. SWE results correlated significantly with liver biopsy. Factors associated with reliable SWE results (i.e., no negative impact on measurements) were age, sex, cirrhosis, antiviral and/or cardiovascular medication, smoking habits and body mass index...
May 4, 2018: Ultrasound in Medicine & Biology
Ned C Rouze, Yufeng Deng, Courtney A Trutna, Mark L Palmeri, Kathryn R Nightingale
Recent investigations of viscoelastic properties of materials have been performed by observing shear wave propagation following localized, impulsive excitations, and Fourier decomposing the shear wave signal to parameterize the frequency-dependent phase velocity using a material model. This paper describes a new method to characterize viscoelastic materials using group shear wave speeds , , and determined from the shear wave displacement, velocity, and acceleration signals, respectively. Materials are modeled using a two-parameter linear attenuation model with phase velocity and dispersion slope at a reference frequency of 200 Hz...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
David Rosen, Jingfeng Jiang
Our primary objective of this work was to design and test a new time-of-flight (TOF) method that allows measurements of shear wave speed (SWS) following impulsive excitation in soft tissues. Particularly, under the assumption of the local plane shear wave, this work named the Fourier-domain shift matching (FDSM) method, estimates SWS by aligning a series of shear waveforms either temporally or spatially using a solution space deduced by characteristic curves of the well-known 1-D wave equation. The proposed SWS estimation method was tested using computer-simulated data, and tissue-mimicking phantom and ex vivo tissue experiments...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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