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https://www.readbyqxmd.com/read/29331356/assessment-of-diastolic-function-using-ultrasound-elastography
#1
Maryam Vejdani-Jahromi, Jenna Freedman, Young-Joong Kim, Gregg E Trahey, Patrick D Wolf
Shear wave elasticity imaging (SWEI) is a novel ultrasound elastography technique for assessing tissue stiffness. In this study, we investigate the potential of SWEI for providing diastolic functional assessment. In 11 isolated rabbit hearts, pressure-volume (PV) measurements were recorded simultaneously with SWEI recordings from the left ventricle free wall before and after induction of global ischemia. PV-based end diastolic stiffness increased by 100% after ischemia (p <0.05), and SWEI stiffness showed an increase of 103% (p <0...
January 10, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29327169/passive-stiffness-of-monoarticular-lower-leg-muscles-is-influenced-by-knee-joint-angle
#2
Filiz Ateş, Ricardo J Andrade, Sandro R Freitas, François Hug, Lilian Lacourpaille, Raphael Gross, Can A Yucesoy, Antoine Nordez
PURPOSE: While several studies demonstrated the occurrence of intermuscular mechanical interactions, the physiological significance of these interactions remains a matter of debate. The purpose of this study was to quantify the localized changes in the shear modulus of the gastrocnemius lateralis (GL), monoarticular dorsi- and plantar-flexor muscles induced by a change in knee angle. METHOD: Participants underwent slow passive ankle rotations at the following two knee positions: knee flexed at 90° and knee fully extended...
January 11, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29322599/non-invasive-evaluation-of-portal-hypertension-using-shear-wave-elastography-analysis-of-two-algorithms-combining-liver-and-spleen-stiffness-in-191-patients-with-cirrhosis
#3
L Elkrief, M Ronot, F Andrade, M Dioguardi Burgio, T Issoufaly, M Zappa, O Roux, J Bissonnette, A Payancé, D Lebrec, C Francoz, O Soubrane, D Valla, F Durand, V Vilgrain, L Castera, P-E Rautou
BACKGROUND: Two algorithms based on sequential measurements of liver and spleen stiffness using two-dimensional shearwave elastography (2D-SWE) have been recently proposed to estimate clinically significant portal hypertension (hepatic venous pressure gradient [HVPG] ≥10 mm Hg) in patients with cirrhosis, with excellent diagnostic accuracy. AIM: To validate externally these algorithms in a large cohort of patients with cirrhosis. METHODS: One hundred and ninety-one patients with stable cirrhosis (Child-Pugh class A 39%, B 29% and C 31%) who underwent liver and spleen stiffness measurements using 2D-SWE at the time of HVPG measurement were included...
January 11, 2018: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29317276/accuracy-of-the-enhanced-liver-fibrosis-test-vs-fibrotest-elastography-and-indirect-markers-in-detection-of-advanced-fibrosis-in-patients-with-alcoholic-liver-disease
#4
Maja Thiele, Bjørn Stæhr Madsen, Janne Fuglsang Hansen, Sönke Detlefsen, Steen Antonsen, Aleksander Krag
BACKGROUND & AIMS: Alcohol is the leading cause of cirrhosis and liver-related mortality, but we lack serum markers to detect compensated disease. We compared the accuracy of the Enhanced Liver Fibrosis test (ELF), the FibroTest, liver stiffness measurements (made by transient elastography and 2-dimensional shear-wave elastography), and 6 indirect marker tests in detection of advanced liver fibrosis (Kleiner stage ≥F3). METHODS: We performed a prospective study of 10 liver fibrosis markers (patented and not), all performed on the same day...
January 6, 2018: Gastroenterology
https://www.readbyqxmd.com/read/29317043/the-role-of-sonoelastography-in-breast-lesions
#5
Richard G Barr
There is a large body of published material that supports the use of elastography, both strain and shear wave, for characterization of breast lesions. To a lesser extent, elastography can be used in the detection of breast abnormalities. This article reviews the principles of elastography regarding breast imaging, reviews the techniques to perform both strain and shear wave elastography, and reviews the literature and discusses how elastography can be used to improve the characterization of breast lesions to allow for decrease in the number of short-term follow-up examinations and benign biopsies...
February 2018: Seminars in Ultrasound, CT, and MR
https://www.readbyqxmd.com/read/29315789/three-dimensional-shear-wave-elastography-for-differentiating-benign-from-malignant-thyroid-nodules
#6
Chong-Ke Zhao, Shi-Gao Chen, Azra Alizad, Ya-Ping He, Qiao Wang, Dan Wang, Wen-Wen Yue, Kun Zhang, Shen Qu, Qing Wei, Hui-Xiong Xu
OBJECTIVES: To prospectively evaluate the diagnostic performance of 3-dimensional (3D) shear wave elastography (SWE) for assessing thyroid nodules. METHODS: A total of 176 surgically or cytologically confirmed thyroid nodules (63 malignant and 113 benign) in 176 patients who had undergone conventional ultrasound (US), 2-dimensional (2D) SWE, and 3D SWE examinations were included in this study. Quantitative elasticity values (mean elasticity, maximum elasticity, and standard deviation of elasticity of a large region of interest and mean elasticity of a 2-mm region of interest) were measured on 2D and 3D SWE...
January 9, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29301166/normal-range-of-patellar-tendon-elasticity-using-the-sharewave-elastography-technique-an-in-vivo-study-in-normal-volunteers
#7
Alexandre Hardy, Camille Rodaix, Claudio Vergari, Raphael Vialle
In-vivo investigation of tendon mechanical properties in healthy subjects using Shear Wave Elastography (SWE) techniques is a relatively new field of study. This work aims to evaluate the elastic properties of the patellar tendon in various knee range of flexion. Twenty healthy adult subjects were enrolled in the study. Shear wave speed (SWS) in the patellar tendon was measured in three different positions: Knee extended, knee semi-flexed (30°), and knee flexed (90°). Mean shear modulus was 50.9 +- 33.1 kPa in knee extension position, 137...
December 22, 2017: Surgical Technology International
https://www.readbyqxmd.com/read/29286208/diffuse-liver-infiltration-by-lobular-breast-carcinoma-shear-wave-elastography-as-gold-standard-imaging-study
#8
Armando Orlandi, Matteo Garcovich, Mariantonietta di Salvatore, Laura Riccardi, Vincenzo Arena, Maria Alessandra Calegari, Maurizio Pompili, Carlo Barone
No abstract text is available yet for this article.
December 29, 2017: Breast Journal
https://www.readbyqxmd.com/read/29283342/acoustic-radiation-force-induced-creep-recovery-arficr-a-noninvasive-method-to-characterize-tissue-viscoelasticity
#9
Carolina Amador Carrascal, Shigao Chen, Matthew W Urban, James F Greenleaf
Ultrasound shear wave elastography is a promising noninvasive, low cost, and clinically viable tool for liver fibrosis staging. Current shear wave imaging technologies on clinical ultrasound scanners ignore shear wave dispersion and use a single group velocity measured over the shear wave bandwidth to estimate tissue elasticity. The center frequency and bandwidth of shear waves induced by acoustic radiation force depend on the ultrasound push beam (push duration, -number, etc.) and the viscoelasticity of the medium, and therefore are different across scanners from different vendors...
January 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29282263/feasibility-of-2-d-ultrasound-shear-wave-elastography-of-fetal-lungs-in-case-of-threatened-preterm-labour-a-study-protocol
#10
Nicolas Mottet, Sébastien Aubry, Chrystelle Vidal, Guillaume Boiteux, Jean-Patrick Metz, Didier Riethmuller, Lionel Pazart, Rajeev Ramanah
INTRODUCTION: 2-D ultrasound shear wave elastography (SWE) could be considered as a new noninvasive tool for monitoring fetal lung development based on evaluation of mechanical properties during pregnancy. Interesting results are available concerning the use of SWE on developing organs, especially on premature infants and animal models. The main objective in this study is to evaluate the feasibility of 2-D SWE in human fetal lungs between 24 and 34 weeks of gestation (WG). The secondary objective is to modellise fetal lung-to-liver elastography ratio (LLE ratio) and to assess variations between normal lung and lung surfactant-enriched after a corticosteroids course indicated for a threatened preterm labour (TPL)...
December 26, 2017: BMJ Open
https://www.readbyqxmd.com/read/29282062/supraspinatus-muscle-elasticity-measured-with-real-time-shear-wave-ultrasound-elastography-correlates-with-mri-spectroscopic-measured-amount-of-fatty-degeneration
#11
Fabian Gilbert, Detlef Klein, Andreas Max Weng, Herbert Köstler, Benedikt Schmitz, Jonas Schmalzl, Dirk Böhm
BACKGROUND: Fatty Degeneration (FD) of the rotator cuff muscles influences functional and anatomical outcome after rotator cuff repair. The MRI based estimation of fatty degeneration is the gold standard. There is some evidence that Ultrasound elastography (EUS) can detect local differences of tissue stiffness in muscles and tendons. Shear-wave elastography (SWE) was evaluated to determine the extent to which shear wave velocity was associated with measures of fatty degeneration. MRI-spectroscopic fat measurement was used as a reference to quantify the amount of fat in the muscle belly...
December 28, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29277746/bioinspired-bouligand-cellulose-nanocrystal-composites-a-review-of-mechanical-properties
#12
REVIEW
Bharath Natarajan, Jeffrey W Gilman
The twisted plywood, or Bouligand, structure is the most commonly observed microstructural motif in natural materials that possess high mechanical strength and toughness, such as that found in bone and the mantis shrimp dactyl club. These materials are isotropically toughened by a low volume fraction of soft, energy-dissipating polymer and by the Bouligand structure itself, through shear wave filtering and crack twisting, deflection and arrest. Cellulose nanocrystals (CNCs) are excellent candidates for the bottom-up fabrication of these structures, as they naturally self-assemble into 'chiral nematic' films when cast from solutions and possess outstanding mechanical properties...
February 13, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29276802/comparison-of-tissue-stiffness-using-shear-wave-elastography-in-men-with-normal-testicular-tissue-testicular-microlithiasis-and-testicular-cancer
#13
Malene Roland Pedersen, Henrik Møller, Palle Jørn Sloth Osther, Peter Vedsted, René Holst, Søren Rafael Rafaelsen
Objectives: To compare elastography measurements in men with normal testicular tissue, testicular microlithiasis and testicular cancer. Methods: A total of 248 consecutive patients were included. All men provided written informed consent. Testicular stiffness was assessed using shear wave elastography (SWE). Three SWE velocity measurements were assessed in each testicle. The patients were divided into three groups; men with normal testicular tissue (n=130), men with testicular microlithiasis (n=99) and men with testicular cancer (n=19)...
September 2017: Ultrasound International Open
https://www.readbyqxmd.com/read/29275098/breast-lesion-classification-based-on-supersonic-shear-wave-elastography-and-automated-lesion-segmentation-from-b-mode-ultrasound-images
#14
Yanyan Yu, Yang Xiao, Jieyu Cheng, Bernard Chiu
Supersonic shear-wave elastography (SWE) has emerged as a useful imaging modality for breast lesion assessment. Regions of interest (ROIs) were required to be specified for extracting features that characterize malignancy of lesions. Although analyses have been performed in small rectangular ROIs identified manually by expert observers, the results were subject to observer variability and the analysis of small ROIs would potentially miss out important features available in other parts of the lesion. Recent investigations extracted features from the entire lesion segmented by B-mode ultrasound images either manually or semi-automatically, but lesion delineation using existing techniques is time-consuming and prone to variability as intensive user interactions are required...
December 15, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29260258/reproducibility-of-shear-wave-elastography-measuresof-the-achilles-tendon
#15
Catherine Payne, Peter Watt, Mara Cercignani, Nick Webborn
OBJECTIVE: To assess the reproducibility of shear wave elastography (SWE) measures in the Achilles tendon (AT) in vivo. MATERIALS AND METHODS: Shear wave velocity (SWV) of 14 healthy volunteers [7 males, 7 females; mean age 26.5 ± 3.8 years, mean height 171.6 ± 10.9 cm, mean Victorian Institute of Sports Assessment Achilles questionnaire (VISA-A) score 99.4 ± 1.2] was measured with the foot relaxed and fixed at 90°. Data were collected over five consecutive measures and 5 consecutive days...
December 19, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29259380/clinical-value-of-liver-and-spleen-shear-wave-velocity-in-predicting-the-prognosis-of-patients-with-portal-hypertension
#16
Yan Zhang, Da-Feng Mao, Mei-Wu Zhang, Xiao-Xiang Fan
AIM: To explore the relationship of liver and spleen shear wave velocity in patients with liver cirrhosis combined with portal hypertension, and assess the value of liver and spleen shear wave velocity in predicting the prognosis of patients with portal hypertension. METHODS: All 67 patients with liver cirrhosis diagnosed as portal hypertension by hepatic venous pressure gradient in our hospital from June 2014 to December 2014 were enrolled into this study. The baseline information of these patients was recorded...
December 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29249457/assessing-liver-stiffness-by-2-d-shear-wave-elastography-in-a-healthy-cohort
#17
Felix Bende, Anesa Mulabecirovic, Ioan Sporea, Alina Popescu, Roxana Sirli, Odd Helge Gilja, Mette Vesterhus, Roald Flesland Havre
The aim of this study was to assess the normal ranges of liver stiffness measurements (LSMs) in participants with healthy livers, using General Electric 2-D shear wave elastography (2-D-SWE-GE) compared with transient elastography (TE). We included 80 participants with healthy livers and without known liver disease, in whom liver stiffness was evaluated in the same session using two elastographic methods, TE and 2-D-SWE-GE. Reliable LSMs were defined for TE as the median of 10 measurements with a success rate of ≥60% and an interquartile range (IQR) < 30%, and for 2-D-SWE-GE, as the median of 10 measurements acquired in a homogenous area and an IQR < 30%...
February 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29249167/comparison-of-ultrasound-shear-wave-elastography-with-magnetic-resonance-elastography-and-renal-microvascular-flow-in-the-assessment-of-chronic-renal-allograft-dysfunction
#18
Stephan R Marticorena Garcia, Jing Guo, Michael Dürr, Timm Denecke, Bernd Hamm, Ingolf Sack, Thomas Fischer
Background Monitoring of renal allograft function is essential for early identification of dysfunction and improvement of kidney transplant (KTX) outcome. Purpose To non-invasively assess renal stiffness in KTX recipients using ultrasound shear wave elastography (USE) in correlation with multifrequency magnetic resonance elastography (MRE), renal allograft function, and renal microvascular flow determined using a novel ultrasound microvascular imaging technique. Material and Methods This prospective study investigated 25 KTXs (functional KTX [FCT], n = 14; chronic KTX insufficiency [DYS], n = 11) in 20 KTX recipients (mean age = 43 ± 14 years)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/29248161/liver-elastography-what-it-is-how-it-is-done-and-how-it-is-interpreted
#19
V Murad Gutiérrez, J A Romero Enciso
Liver elastography is a noninvasive method for diagnosing fibrosis that has been developed over the last decade in response to the limitations of liver biopsies, blood markers, and traditional imaging modalities. There are different methods of measuring tissue stiffness through ultrasound; thus far, shear wave elastography has proven superior for diagnosing clinically significant liver fibrosis, where early detection modifies the approach to treatment and improves prognosis. This article aims to provide a brief review of the different methods for performing elastography with ultrasound, focusing especially on shear wave elastography and on technical aspects for carrying out the procedure and key points for interpreting the findings...
December 13, 2017: Radiología
https://www.readbyqxmd.com/read/29246767/detection-of-changes-in-cervical-softness-using-shear-wave-speed-in-early-versus-late-pregnancy-an-in-vivo-cross-sectional-study
#20
Lindsey C Carlson, Timothy J Hall, Ivan M Rosado-Mendez, Mark L Palmeri, Helen Feltovich
The aim of this study was to assess the ability of shear wave elasticity imaging (SWEI) to detect changes in cervical softness between early and late pregnancy. Using a cross-sectional study design, shear wave speed (SWS) measurements were obtained from women in the first trimester (5-14 wk of gestation) and compared with estimates from a previous study of women at term (37-41 wk). Two sets of five SWS measurements were made using commercial SWEI applications on an ultrasound system equipped with a prototype catheter transducer (128 elements, 3-mm diameter, 14-mm aperture)...
December 12, 2017: Ultrasound in Medicine & Biology
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