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Shear-wave elastography

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https://www.readbyqxmd.com/read/29776820/mechanical-interaction-between-neighboring-muscles-in-human-upper-limb-evidence-for-epimuscular-myofascial-force-transmission-in-humans
#1
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
https://www.readbyqxmd.com/read/29775815/simultaneous-magnetic-resonance-and-optical-elastography-acquisitions-comparison-of-displacement-images-and-shear-modulus-estimations-using-a-single-vibration-source
#2
Spencer T Brinker, Steven P Kearney, Thomas J Royston, Dieter Klatt
The mechanical properties of tissue are sensitive to pathological changes, which is the basis for using dynamic elastography as a diagnostic tool. The purpose of this study is a concurrent cross-modality comparison of two dynamic elastography methods, Magnetic Resonance Elastography (MRE) and Scanning Laser Doppler Vibrometry (SLDV) using a single vibration source method. Cylindrical soft tissue mimicking specimens of Plastisol and Ecoflex are stimulated with 60, 100, 150, and 250 Hz sinusoidal vibration during imaging...
May 8, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29774454/analysis-of-three-ultrasound-elastography-techniques-for-grading-liver-fibrosis-in-patients-with-chronic-hepatitis-b
#3
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
https://www.readbyqxmd.com/read/29765694/development-of-an-intravascular-ultrasound-elastography-based-on-a-dual-element-transducer
#4
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
https://www.readbyqxmd.com/read/29762599/coaxial-excitation-longitudinal-shear-wave-measurement-for-quantitative-elasticity-assessment-using-phase-resolved-optical-coherence-elastography
#5
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
https://www.readbyqxmd.com/read/29761535/diagnostic-performance-of-shear-wave-elastography-in-patients-with-autoimmune-liver-disease
#6
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
https://www.readbyqxmd.com/read/29761275/quantitative-transrectal-shear-wave-elastography-undergoing-salvage-extraperitoneal-laparoscopic-radical-prostatectomy-following-failed-radiotherapy
#7
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
https://www.readbyqxmd.com/read/29751202/diagnostic-performances-of-shear-wave-elastography-and-b-mode-ultrasound-to-differentiate-benign-and-malignant-breast-lesions-the-emphasis-on-the-cutoff-value-of-qualitative-and-quantitative-parameters
#8
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
https://www.readbyqxmd.com/read/29745983/muscle-hardness-and-masticatory-myofascial-pain-assessment-and-clinical-relevance
#9
REVIEW
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
https://www.readbyqxmd.com/read/29745753/does-acoustic-radiation-force-elastography-improve-the-diagnostic-capability-of-ultrasound-in-the-preoperative-characterization-of-masses-of-the-parotid-gland
#10
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
https://www.readbyqxmd.com/read/29743056/elasticity-standard-values-of-the-achilles-tendon-assessed-with-acoustic-radiation-force-impulse-elastography-on-healthy-volunteers-a-cross-section-study
#11
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
https://www.readbyqxmd.com/read/29740972/a-2d-finite-element-model-for-shear-wave-propagation-in-biological-soft-tissues-application-to-magnetic-resonance-elastography
#12
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
https://www.readbyqxmd.com/read/29740826/can-point-shear-wave-elastography-differentiate-focal-nodular-hyperplasia-from-hepatocellular-adenoma
#13
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
https://www.readbyqxmd.com/read/29736835/value-of-two-dimensional-shear-wave-elastography-for-assessing-acute-liver-congestion-in-a-bama-mini-pig-model
#14
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
https://www.readbyqxmd.com/read/29735314/on-patient-related-factors-and-their-impact-on-ultrasound-based-shear-wave-elastography-of-the-liver
#15
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
https://www.readbyqxmd.com/read/29732595/noninvasive-measurement-of-sciatic-nerve-stiffness-in-patients-with-chronic-low-back-related-leg-pain-using-shear-wave-elastography
#16
Tiago Neto, Sandro R Freitas, Ricardo J Andrade, João R Vaz, Bruno Mendes, Telmo Firmino, Paula M Bruno, Antoine Nordez, Raúl Oliveira
OBJECTIVES: The purpose of this study was to determine whether sciatic nerve stiffness is altered in people with chronic low back-related leg pain by using shear wave elastography. METHODS: In this cross-sectional study, the sciatic nerve shear wave velocity (ie, an index of stiffness) was measured in both legs of 16 participants (8 with unilateral low back-related leg pain and 8 healthy controls). Sciatic stiffness was measured during a passive ankle dorsiflexion motion performed at 2°/s in an isokinetic dynamometer...
May 6, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29732594/transvaginal-ultrasound-shear-wave-elastography-for-the-evaluation-of-benign-uterine-pathologies-a-prospective-pilot-study
#17
Man Zhang, Ashish P Wasnik, William R Masch, Jonathan M Rubin, Ruth C Carlos, Elisabeth H Quint, Katherine E Maturen
OBJECTIVES: This study evaluated the diagnostic performance of transvaginal ultrasound (TVUS) shear wave elastography (SWE) for evaluating uterine adenomyosis and leiomyomas. METHODS: Institutional Review Board approval was obtained for prospective enrollment of 34 premenopausal women with pelvic pain and/or bleeding between January 2015 and June 2016. TVUS SWE was performed with regions of interest in multiple uterine segments and shear wave velocities(SWVs) were recorded...
May 6, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29730686/evaluation-of-tendinosis-of-the-long-head-of-the-biceps-tendon-by-strain-and-shear-wave-elastography
#18
Mehmet Hamdi Sahan, Mikail Inal, Veysel Burulday, Turgut Kultur
AIM: To investigate strain (SE) and shear wave elastography (SWE) characteristics of the long head of the biceps tendon (LHBT) tendinosis in comparison with magnetic resonance imaging (MRI) findings. MATERIAL AND METHODS: Twenty patients with a MRI diagnosis of tendinosis and twenty healthy subjects with normal LHBT in MRI were prospectively examined by SE and SWE. SE color mapping was divided into four types in accordance with elasticity designs: type I predominantly blue (hardest tissue), type II predominantly blue-green (hard tissue), type III predominantly green (intermediate tissue), type IV predominantly green-yellow-red (soft tissue)...
May 2, 2018: Medical Ultrasonography
https://www.readbyqxmd.com/read/29730683/effects-of-passive-muscle-stiffness-measured-by-shear-wave-elastography-muscle-thickness-and-body-mass-index-on-athletic-performance-in-adolescent-female-basketball-players
#19
Orkun Akkoc, Emine Caliskan, Zuhal Bayramoglu
AIMS: Athletic performance in basketball comprises the contributions of anaerobic and aerobic performance. The aim was to investigate the effects of passive muscle stiffness, using shear wave elastography (SWE), as well as muscle thickness, and body mass index (BMI), on both aerobic and anaerobic performances in adolescent female basketball players.Material and methods: Anaerobic and aerobic (VO2max) performance was assessed using the vertical jump and shuttle run tests, respectively, in 24 volunteer adolescent female basketball players...
May 2, 2018: Medical Ultrasonography
https://www.readbyqxmd.com/read/29730678/reliability-of-testicular-stiffness-quantification-using-shear-wave-elastography-in-predicting-male-fertility-a-preliminary-prospective-study
#20
Alpaslan Yavuz, Adem Yokus, Kerem Taken, Abdussamet Batur, Mesut Ozgokce, Harun Arslan
AIMS: To evaluate the reliability of testicular stiffness quantification using shear wave elastography in predicting the fertility potential of males and for the pre-diagnosis of disorders based upon sperm quantification. MATERIAL AND METHODS: One hundred males between the ages of 19-49 years (mean age of 28.77±6.11), ninety of whom with complaints of infertility, were enrolled in this prospective study. Scrotal grey-scale, Doppler ultrasound (US), and mean testicular shear wave velocity quantifications (SWVQs) were performed...
May 2, 2018: Medical Ultrasonography
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