keyword
MENU ▼
Read by QxMD icon Read
search

Shear-Wave

keyword
https://www.readbyqxmd.com/read/28231589/ultrasound-elastography-in-diffuse-and-focal-parotid-gland-lesions
#1
Naglaa Mansour, Benedikt Hofauer, Andreas Knopf
In Europe, ultrasound (US) is the diagnostic gold standard for the visualisation of parotid gland disorders. While high-resolution B-mode US reliably visualises focal lesions, its diagnostic capacity to distinguish tumour entities or to characterise diffuse lesions remains poor. Strain elastography (SE) and shear wave elastography (SWE) are novel imaging techniques that provide additional information about tissue elasticity. SE analyses the strain or displacement in response to force or compression and, therefore, shows the relative tissue elasticity within a selected region of interest (ROI)...
February 24, 2017: ORL; Journal for Oto-rhino-laryngology and its related Specialties
https://www.readbyqxmd.com/read/28231488/the-value-of-elastpq-for-the-evaluation-of-liver-stiffness-in-patients-with-b-and-c-chronic-hepatopathies
#2
Ruxandra Mare, Ioan Sporea, Raluca Lupuşoru, Roxana Şirli, Alina Popescu, Mirela Danila, Corina Pienar
: The aim of this study was to evaluate the diagnostic performance of a point shear wave elastography using ARFI technique - ElastPQ, in patients with B and C chronic hepatopathies, using Transient Elastography (TE) as the reference method, since it is a validated method for liver fibrosis assessment. SUBJECTS AND METHODS: the study included 228 consecutive subjects with chronic hepatopathies (26% HBV, 74% HCV) from whom 51% had liver cirrhosis. Liver stiffness (LS) was evaluated in the same session by means of 2 elastographic methods: TE (FibroScan, EchoSens) and ElastPQ (Affinity, Philips) techniques...
February 9, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28227120/tissue-characterization-using-simultaneous-estimation-of-backscatter-coefficient-and-elastic-shear-modulus
#3
Julien Rouyer, Gabriela Torres, Matthew W Urban, Roberto Lavarello, Julien Rouyer, Gabriela Torres, Matthew W Urban, Roberto Lavarello, Gabriela Torres, Matthew W Urban, Julien Rouyer, Roberto Lavarello
Tissue characterization using quantitative ultrasound (QUS) parameters has received significant attention in recent years due to its potential to improve the detection and diagnosis of diseased states. However, the vast majority of studies in QUS tissue typing have used parameters derived from either longitudinal or shear waves in isolation, thereby discarding potentially useful complementary information these parameters may carry. In this study, the simultaneous estimation of backscatter coefficients (derived from longitudinal waves) and shear modulus (derived from shear waves) was implemented on data from a clinical scanner...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227118/shear-wave-elastography-using-wigner-ville-distribution-a-simulated-multilayer-media-study
#4
Pooya Sobhe Bidari, Javad Alirezaie, Jahan Tavakkoli, Pooya Sobhe Bidari, Javad Alirezaie, Jahan Tavakkoli, Javad Alirezaie, Jahan Tavakkoli
Shear Wave Elastography (SWE) is a quantitative ultrasound-based imaging modality for distinguishing normal and abnormal tissue types by estimating the local viscoelastic properties of the tissue. These properties have been estimated in many studies by propagating ultrasound shear wave within the tissue and estimating parameters such as speed of wave. Vast majority of the proposed techniques are based on the cross-correlation of consecutive ultrasound images. In this study, we propose a new method of wave detection based on time-frequency (TF) analysis of the ultrasound signal...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227117/altered-viscoelastic-properties-of-stroke-affected-muscles-estimated-using-ultrasound-shear-waves-preliminary-data
#5
Ghulam Rasool, Allison B Wang, William Z Rymer, Sabrina S M Lee, Ghulam Rasool, Allison B Wang, William Z Rymer, Sabrina S M Lee, Ghulam Rasool, Sabrina S M Lee, Allison B Wang, William Z Rymer
As a result of a brain injury such as stroke, the skeletal muscles may undergo numerous structural and functional alterations. These abnormal changes are linked to muscle weakness, joint contracture, and abnormal muscle tone and eventually, result in motor impairment. A subset of these alterations affects passive muscle stiffness, i.e., viscoelastic properties. However, in vivo estimation of changes in viscoelastic properties is a challenging task. Here, we used the shear wave velocity, estimated through ultrasound SuperSonic imaging (SSI), as a surrogate for viscoelastic properties...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226720/comparison-of-viscoelastic-property-characterization-of-plastisol-phantoms-with-magnetic-resonance-elastography-and-high-frequency-rheometry
#6
P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier, P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier, P M Lefebvre, E Brusseau, S Nicolle, D Grenier, S A Lambert
This study aims at evaluating Magnetic Resonance Elastography (MRE) as a reliable technique for the characterization of viscoelastic properties of soft tissues. Three phantoms with different concentrations of plastisol and softener were prepared in order to mechanically mimic a broad panel of healthy and pathological soft tissues. Once placed in a MRI device, each sample was excited by a homemade external driver, inducing shear waves within the medium. The storage (G') and loss (G") moduli of each phantom were then reconstructed from MRE acquisitions over a frequency range from 300 to 1,000 Hz, by applying a 2D Helmholtz inversion algorithm...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222500/conventional-us-combined-with-acoustic-radiation-force-impulse-imaging-arfi-for%C3%A2-prediction-of-triple-negative-breast-cancer-and-the-risk-of-lymphatic-metastasis
#7
Huan Pu, Li-Xia Zhao, Ming-Hua Yao, Guang Xu, Hui Liu, Huixiong Xu, Rong Wu
PURPOSE: To evaluate the combination of conventional ultrasound (US) and acoustic radiation force impulse imaging (ARFI) in predicting triple-negative breast cancer and the likelihood of lymphatic metastasis. MATERIALS AND METHODS: In total 178 women presenting from May 2013 to September 2015 with pathologically proven triple-negative (n = 60) or hormone receptor (HR)-positive/human epidermal growth factor receptor 2 (HER2)-negative breast cancer (n = 118) were reviewed...
February 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28218798/shear-wave-elastography-imaging-for-the-features-of-symptomatic-carotid-plaques-a-feasibility-study
#8
Zhe Lou, Jun Yang, Li Tang, Youhe Jin, Jinsong Zhang, Chao Liu, Qiaobei Li
OBJECTIVES: Shear wave elastography (SWE) was performed to evaluate the Young's modulus of carotid plaques in patients presenting with cerebrovascular incidents, to estimate the clinical value and feasibility of this approach. METHODS: Sixty-one patients (mean age, 65 years; 45 men) underwent common duplex ultrasonic examination and SWE evaluation. The patients were divided into the symptomatic and asymptomatic groups based on the presence of unilateral focal neurological symptoms...
February 20, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28214750/propagation-of-thickness-shear-waves-in-a-periodically-corrugated-quartz-crystal-plate-and-its-application-exploration-in-acoustic-wave-filters
#9
Peng Li, Li Cheng
The propagation of thickness shear waves in a periodically corrugated quartz crystal plate is investigated in the present paper using a power series expansion technique. In the proposed simulation model, an equivalent continuity of shear stress moment is introduced as an approximation to handle sectional interfaces with abrupt thickness changes. The Bloch theory is applied to simulate the band structures for three different thickness variation patterns. It is shown that the power series expansion method exhibits good convergence and accuracy, in agreement with results by finite element method (FEM)...
February 7, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28214021/arfi-elastography-changes-after-direct-acting-antiviral-treatment-in-transplanted-livers-with-relapse-of-hepatitis-c-virus-infection
#10
M Alfageme Zubillaga, T Fontanilla Echeveste, I Pérez González, A Royuela Vicente, A M Duca, R M Ruiz Peralbo, C González Hernando
OBJECTIVE: To evaluate the changes in the values obtained in acoustic radiation force impulse (ARFI) elastography of the liver after antiviral treatment in patients with liver transplants and hepatitis C virus (HVC) infection recurring after transplantation. MATERIAL AND METHODS: We studied 15 patients infected with HVC who had received liver transplants where an HVC infection recurring in the graft within one year after the transplant was treated with direct-acting antivirals...
February 14, 2017: Radiología
https://www.readbyqxmd.com/read/28211807/two-dimensional-shear-wave-elastography-of-breast-lesions-comparison-of-two-different-systems
#11
Wei-Wei Ren, Xiao-Long Li, Ya-Ping He, Dan-Dan Li, Dan Wang, Chong-Ke Zhao, Xiao-Wan Bo, Bo-Ji Liu, Wen-Wen Yue, Hui-Xiong Xu
OBJECTIVE: To evaluate the diagnostic performance of two different shear wave elastography (SWE) techniques in distinguishing malignant breast lesions from benign ones. MATERIALS AND METHODS: From March 2016 to May 2016, a total of 153 breast lesions (mean diameter, 16.8 mm±10.5; range 4.1-90.0 mm) in 153 patients (mean age, 46.4 years±15.1; age range 20-86 years) were separately performed by two different SWE techniques (i.e. T-SWE, Aplio500, Toshiba Medical System, Tochigi, Japan; and S-SWE, the Aixplorer US system, SuperSonic Imagine, Provence, France)...
February 17, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28211803/comparison-of-two-different-2d-shear-wave-speed-imaging-techniques-for-diagnosis-of-thyroid-nodules-the-first-initial-experience
#12
Ya-Ping He, Hui-Xiong Xu, Xiao-Long Li, Dan-Dan Li, Xiao-Wan Bo, Chong-Ke Zhao, Bo-Ji Liu, Dan Wang, Hui-Xiong Xu
OBJECTIVE: The aim of this study was to compare the diagnostic performance of two different 2D shear wave speed imaging techniques of Virtual Touch Tissue Imaging & Quantification (VTIQ) and Toshiba shear wave elastography (T-SWE) in predicting malignant thyroid nodules (TNs). MATERIALS AND METHODS: 75 TNs in 75 patients which were subject to both VTIQ and T-SWE examinations were enrolled and analyzed. Shear wave speed (SWS) values on VTIQ and T-SWE were computed (SWS_max, min, mean and median)...
February 17, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28211802/evaluation-of-the-severity-of-capsular-contracture-using-elastography-after-breast-implant-reconstruction
#13
Yoshihiro Sowa, Isao Yokota, Sizu Itsukage, Katsuhiko Nakatsukasa, Katsuhiko Sakaguchi, Tetsuya Taguchi, Toshiaki Numajiri
BACKGROUND: Capsular contracture around implants is a common complication after breast reconstruction. Strain elastography (STE) and shear-wave elastography (SWE) are noninvasive imaging techniques that can measure tissue stiffness and thickness of the capsule. OBJECTIVE: The purposes of the study were to compare STE and SWE for measurement of capsular contracture after breast implant reconstruction using intra-class correlation coefficients (ICCs) and to investigate the correlation of these data with the Baker score, which is the most frequently used clinical staging scale for capsule contracture...
February 17, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28208973/shear-wave-elastography-features-of-primary-non-hodgkin-s-lymphoma-of-the-breast-a-case-report-and-literature-review
#14
Youdong Kim, Kyung Hee Ko, Hae Kyoung Jung, Hyun Ju Lee
Lymphoma is a rare malignancy of the breast, comprising approximately 0.04 to 0.5% of breast malignancies. Because the clinical findings of breast lymphoma are nonspecific and similar to those of breast carcinoma, it is important to distinguish breast lymphoma from other breast disease on the basis of radiologic findings. Elastography is an interesting imaging tool that reflects the tissue stiffness, increasingly being used in the evaluation of breast tumours. However, only a limited number of studies have focused on the elastographic findings of breast lymphoma...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28207961/muscle-stiffness-of-posterior-lower-leg-in-runners-with-a-history-of-medial-tibial-stress-syndrome
#15
Junya Saeki, Masatoshi Nakamura, Sayaka Nakao, Kosuke Fujita, Ko Yanase, Noriaki Ichihashi
Previous history of medial tibial stress syndrome (MTSS) is a risk factor for MTSS relapse, which suggests that there might be some physical factors that are related to MTSS development in runners with a history of MTSS. The relationship between MTSS and muscle stiffness can be assessed in a cross-sectional study that measures muscle stiffness in subjects with a history of MTSS, who do not have pain at the time of measurement, and in those without a history of MTSS. The purpose of this study was to compare the shear elastic modulus, which is an index of muscle stiffness, of all posterior lower leg muscles of subjects with a history of MTSS and those with no history and investigate which muscles could be related to MTSS...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28192849/shear-wave-elastography-of-the-liver-review-on-normal-values
#16
Yi Dong, Roxana Sirli, Giovanna Ferraioli, Ioan Sporea, Liliana Chiorean, Xinwu Cui, Mei Fan, Wen-Ping Wang, Odd Helge Gilja, Paul S Sidhu, Christoph F Dietrich
Shear wave elastography (SWE) has been developed to non-invasively estimate liver stiffness. Different techniques are available and they are described in detail in the EFSUMB guidelines on elastography. However, there are only a few published studies investigating normal ranges in healthy subjects by comparing different equipment and analysing influencing factors. In the present review, we summarize the impact factors on liver stiffness measurement (LSM) using SWE, report its reproducibility, and define normal range tables of LSM in healthy subjects for clinical practice according to the published literature...
February 2017: Zeitschrift Für Gastroenterologie
https://www.readbyqxmd.com/read/28188109/quantitative-evaluation-of-masseter-muscle-stiffness-in-patients-with-temporomandibular-disorders-using-shear-wave-elastography
#17
Makiko Takashima, Yoshiaki Arai, Atsushi Kawamura, Takafumi Hayashi, Ritsuo Takagi
PURPOSE: The aim of this study was to quantify masseter muscle stiffness in patients with masticatory myofascial pain. METHODS: Stiffness was measured using shear wave elastography, which expresses stiffness as shear wave velocity (Vs). A phantom study was conducted to confirm the reliability of the measuring device. The study participants were 26 females with bilateral masseter muscle pain who were classified into either Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) group Ia (myofascial pain; n=13) or RDC/TMD group Ib (myofascial pain with limited opening; n=13)...
February 7, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28187927/value-of-shear-wave-elastography-in-the-diagnosis-of-gouty-and-non-gouty-arthritis
#18
Yuanjiao Tang, Feng Yan, Yujia Yang, Xi Xiang, Liyun Wang, Lingyan Zhang, Li Qiu
Our aim was to analyze the diagnostic performance of shear wave elastography (SWE) in the diagnosis of gouty arthritis (GA) and non-gouty arthritis (non-GA). Thirty-nine patients in the GA group and 55 patients in the non-GA group were included in the study. Based on the echo intensity of the joint lesions, the GA group was subdivided into hypo-echoic GA, slightly hyper-echoic GA and hyper-echoic GA subgroups. Quantitative SWE features were evaluated and receiver operating characteristic analysis was performed...
February 7, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28180197/added-value-of-two-dimensional-shear-wave-elastography-to-ultrasonography-for-staging-common-femoral-vein-thrombi
#19
Fu-Shun Pan, Wen-Shuo Tian, Jia Luo, Ming Liu, Jin-Yu Liang, Ming Xu, Yan-Ling Zheng, Xiao-Yan Xie
: prove the performance for staging common femoral vein thrombi (CFVT). MATERIAL AND METHODS: A total of 194 consecutive patients with CFVT who underwent US and 2D-SWE were enrolled. These patients were categorized into three groups according to CFVT duration: Stage A (≤14 days), Stage B (14 days to 6 months), and Stage C (≥6 months). The diagnostic performance was assessed by the area under the receiver operating characteristic curve (AUC). RESULTS: Among all US features, CFV diameter ratio of thrombosed leg to contralateral leg (CFVD_ratio) showed the highest AUC in predicting Stage A and Stage C (0...
January 31, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28180195/evaluation-of-the-optic-nerve-using-strain-and-shear-wave-elastography-in-patients-with-multiple-sclerosis-and-healthy-subjects
#20
Mikail İnal, Sinan Tan, Erhan M Yumusak, Mehmet Hamdi Şahan, Murat Alpua, Kemal Örnek
AIMS: Our aim was to evaluate the elasticity features of the optic nerve using strain (SE) and shear wave elastography (SWE) in multiple sclerosis (MS) patients in comparison with healthy subjects. MATERIAL AND METHODS: One hundred and seven optic nerves from 54 MS patients and 118 optic nerves from 59 healthy subjects were examined prospectively by SE and SWE. Optic nerves were divided into three types in accordance to the elasticity designs, as follows: type 1 predominantly blue (hardest tissue); type 2 predominantly blue/green (hard tissue); and type 3 predominantly green (intermediate tissue)...
January 31, 2017: Medical Ultrasonography
keyword
keyword
26198
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"