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Elastography

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https://www.readbyqxmd.com/read/30020268/transient-elastography-identifies-the-risk-of-esophageal-varices-and-bleeding-in-patients-with-hepatitis-b-virus-related-liver-cirrhosis
#1
Qingjing Zhu, Weijun Wang, Jinfang Zhao, Afnan Ahmed Mohamed Al-Asbahi, Ying Huang, Fan Du, Jianning Zhou, Yuhu Song, Keshu Xu, Jin Ye, Ling Yang
This study aimed to analyze the diagnostic accuracy of liver stiffness for predicting esophageal variceal grading and the risk of esophageal variceal bleeding (EVB) in cases of cirrhosis. Hematological and biochemical parameters were measured and transient elastography was performed in 88 patients with hepatitis B-related cirrhosis undergoing endoscopy for esophageal varices. Esophageal varices grade was highly correlated with liver stiffness measurement (LSM) and the liver stiffness spleen diameter-to-platelet score in cirrhosis...
July 17, 2018: Ultrasound Quarterly
https://www.readbyqxmd.com/read/30018515/ultrasound-elastography-can-detect-placental-tissue-abnormalities
#2
Tomoya Hasegawa, Naoaki Kuji, Fumiaki Notake, Tetsu Tsukamoto, Toru Sasaki, Motohiro Shimizu, Kazunori Mukaida, Hiroe Ito, Keiichi Isaka, Hirotaka Nishi
Background: In this prospective cohort study, we examined the utility of elastography to evaluate the fetus and placenta. Patients and methods: Pregnant women in their third trimester of pregnancy, by which time the placenta has formed, were included in this study. A total of 111 women underwent ultrasound examinations, including elastography. Elastographic evaluation was performed using two protocols. First, the placental index (PI) was measured, which quantitatively assesses the hardness of tissue...
June 2018: Radiology and Oncology
https://www.readbyqxmd.com/read/30017464/active-versus-local-vibration-warm-up-effects-on-knee-extensors-stiffness-and-neuromuscular-performance-of-healthy-young-males
#3
Robin Souron, Alessandro Zambelli, Loïc Espeit, Thibault Besson, Darryl J Cochrane, Thomas Lapole
OBJECTIVES: To compare the effects of local-vibration and active warm-up on knee extensors muscle stiffness and neuromuscular performance. DESIGN: Experimental crossover study. METHODS: Thirteen participants performed three 15-min warm-up protocols of control (CON), active (ACT) and local-vibration (LV) in separate testing session. Passive stiffness of vastus lateralis (VL) and vastus medialis (VM) by shear wave elastography and neuromuscular performance were assessed before and 2-min after each condition...
July 10, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/30014566/clinical-application-of-magnetic-resonance-elastography-in-chronic-liver-disease
#4
REVIEW
Hayato Abe, Yutaka Midorikawa, Masahiro Okada, Tadatoshi Takayama
Recent evidence highlighted that the accurate assessment of liver fibrosis is important for evaluating the progression of chronic liver disease. During the past decade, many noninvasive methods have been developed to reduce the need for core-needle biopsy in fibrosis staging and to overcome its limitations such as invasiveness, high costs, low reproducibility, and poor patient consent. The diagnostic performance of magnetic resonance elastography (MRE) is promising for use in clinical practice to evaluate not only liver fibrosis, but also survival and major clinical endpoints such as liver decompensation, portal hypertension, development of hepatocellular carcinoma, and surgical outcomes...
July 16, 2018: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/30014488/the-utility-of-mr-elastography-to-differentiate-nodular-regenerative-hyperplasia-from-cirrhosis
#5
Patrick Navin, Moira Hilscher, Christopher Welle, Taofic Mounajjed, Michael Torbenson, Patrick S Kamath, Sudhakar K Venkatesh
Nodular regenerative hyperplasia (NRH) is characterized by diffuse parenchymal nodularity of the liver with small regenerative nodules, leading to possible portal hypertension. Differentiating NRH from cirrhosis on standard imaging is difficult. We evaluated the potential utility of MRI and MR Elastography (MRE) in differentiating NRH and cirrhosis. This article is protected by copyright. All rights reserved.
July 17, 2018: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/30014204/prospective-comparison-of-diffusion-weighted-mri-and-dynamic-gd-eob-dtpa-enhanced-mri-for-detection-and-staging-of-hepatic-fibrosis-in-primary-sclerosing-cholangitis
#6
S Keller, J Sedlacik, T Schuler, R Buchert, M Avanesov, R Zenouzi, A W Lohse, H Kooijman, J Fiehler, C Schramm, J Yamamura
PURPOSE: To assess the diagnostic value of multiparametric magnetic resonance imaging (MRI) including dynamic Gd-EOB-DTPA-enhanced (DCE) and diffusion-weighted (DW) imaging for diagnosis and staging of hepatic fibrosis in primary sclerosing cholangitis (PSC) using transient elastography as a standard reference. MATERIAL AND METHODS: Multiparametric MRI was prospectively performed on a 3.0-Tesla scanner in 47 patients (age 43.9±14.3 years). Transient elastography derived liver stiffness measurements (LSM), DCE-MRI derived parameters (hepatocellular uptake rate (Ki), arterial (Fa), portal venous (Fv) and total (Ft) blood flow, mean transit time (MTT), and extracellular volume (Ve)) and the apparent diffusion coefficient (ADC) were calculated...
July 16, 2018: European Radiology
https://www.readbyqxmd.com/read/30010559/fourier-domain-beamforming-and-structure-based-reconstruction-for-plane-wave-imaging
#7
Tanya Chernyakova, Regev Cohen, Rotem Mulayoff, Yael Sde-Chen, Christophe Fraschini, Jeremy Bercoff, Yonina C Eldar
Ultrafast imaging based on coherent plane-wave compounding is one of the most important recent developments in medical ultrasound. It significantly improves image quality and allows for much faster image acquisition. This technique, however, requires large computational loads motivating methods for sampling and processing rate reduction. In this work we extend the recently proposed frequency domain beamforming (FDBF) framework to plane-wave imaging. Beamforming in frequency yields the same image quality while using fewer samples...
July 16, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30007831/differentiating-malignant-and-benign-lymph-nodes-using-endobronchial-ultrasound-elastography
#8
Ching-Kai Lin, Kai-Lun Yu, Lih-Yu Chang, Hung-Jen Fan, Yueh-Feng Wen, Chao-Chi Ho
BACKGROUND/PURPOSE: Endobronchial ultrasound (EBUS) elastography is a new technique that provides information on tissue compressibility during endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA). The purposes of this study were to evaluate the utility of EBUS elastography in differentiating malignant and benign mediastinal lymph nodes (LNs) and to explore the factors that influence its accuracy. METHODS: A retrospective chart review of patients who underwent EBUS-TBNA from October 2016 to July 2017 was performed...
July 11, 2018: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/30006828/interobserver-variability-and-stiffness-measurements-of-normal-common-extensor-tendon-in-healthy-volunteers-using-shear-wave-elastography
#9
Halit Nahit Şendur, Emetullah Cindil, Mahinur Cerit, Nur Betül Demir, Aylin Billur Şendur, Suna Özhan Oktar
OBJECTIVES: The purposes of our study are to determine the quantitative elasticity values of normal common extensor tendon (CET) and to assess the interobserver variability of stiffness measurements using shear wave elastography (SWE). MATERIALS AND METHODS: A total of 60 CETs of 30 (15 female, 15 male, mean age 30.2 years) healthy volunteers without any symptoms of lateral epicondylitis were examined by two radiologists. Age, sex, height, weight, body mass index (BMI), and dominant hand of all participants were noted...
July 13, 2018: Skeletal Radiology
https://www.readbyqxmd.com/read/30006125/breast-mass-characterization-using-shear-wave-elastography-and-ultrasound
#10
S Hari, S B Paul, R Vidyasagar, E Dhamija, A D Adarsh, S Thulkar, S Mathur, V Sreenivas, S Sharma, A Srivastava, V Seenu, R Prashad
PURPOSE: To evaluate the role of SWE in characterizing breast masses and ascertain whether additional use of SWE to ultrasound for evaluating BI-RADS 3 and 4a masses could help reduce long-term follow-up and unnecessary biopsies of these suspicious breast masses. MATERIALS AND METHODS: This prospective, cross-sectional study was performed between June 2013 and November 2014. All enrolled patients underwent clinical breast examination, ultrasound, SWE and ultrasound-guided core biopsy of the breast mass...
July 10, 2018: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/30003592/some-comments-on-achilles-and-patellar-tendinopathy-display-opposite-changes-in-elastic-properties-a-shear-wave-elastography-study
#11
Qi Zhang, Qianru Li, Yinghui Hua
We read with great interest the article by Coombes and colleagues [1], who utilized shear wave elastography to compare tendon stiffness of healthy subjects with those with Achilles or patellar tendinopathy. The results showed that compared to healthy controls, patients with Achilles and patellar tendinopathy exhibited lower Achilles tendon stiffness and higher patellar tendon stiffness, respectively. One of the limitations Coombes et al. mentioned in the Discussion section was the heterogeneous tendinopathic population, which included participants with insertional Achilles tendinopathy (n=9; 41%) and non-insertional Achilles tendinopathy (n = 19; 87%) [1]...
July 13, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29998836/quantification-of-skin-stiffness-in-patients-with-systemic-sclerosis-using-real-time-shear-wave-elastography-a-preliminary-study
#12
Yujia Yang, Feng Yan, Liyun Wang, Xi Xiang, Yuanjiao Tang, Qiu Li, Lv Xiaoyan
OBJECTIVES: To assess the diagnostic value of shear wave elastography (SWE) quantification in patients with systemic sclerosis (SSc) and healthy controls. METHODS: Skin elastic modulus (E) values and thicknesses were measured at 6 skin sites between the SSc (n=37) and control (n=37) groups. Thickness and E values were converted into T- and E-scores, to allow skin thickness and stiffness of different regions to be quantified based on a single standard. T- and E-scores were compared with the modified Rodnan skin score (mRSS)...
June 11, 2018: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29996345/-diagnostic-value-of-transient-elastography-for-diagnosis-of-idiopathic-non-cirrhotic-portal-hypertension
#13
C Y He, Y Lyu, H Chen, H B Liu, Q H Wang, J H Fan, B H Luo, T L Yu, X L Yuan, J Tie, J Niu, W G Guo, Z X Yin, G H Han
No abstract text is available yet for this article.
April 20, 2018: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/29996201/-correlation-between-fibroscan-apri-detecting-the-degree-of-esophageal-and-gastric-varices-of-liver-cirrhosis
#14
S Wang, W Zhang, F Zhang, Z Qian, L F Wang, L J Ren, S Yang
Objective: To investigate the predictive value of transient elastography (FibroScan), aspartate aminotransferase-to-platelet ratio index (APRI) in the detection of esophagogastric varices in patients with liver cirrhosis. Methods: 236 patients with liver cirrhosis who met the criteria were selected. All patients underwent gastroscopy. According to the degree of esophagogastric varices, patients were divided into four groups: none, mild, moderate, and severe. The patient's liver stiffness (LSM) and aspartate aminotransferase- to-platelet ratio index (APRI) were measured within 3 days of gastroscopy...
May 20, 2018: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/29995773/meta-analysis-of-the-accuracy-of-transient-elastography-in-measuring-liver-stiffness-to-diagnose-esophageal-varices-in-cirrhosis
#15
Fan Cheng, Hongyan Cao, Jinchun Liu, Lijun Jiang, Hongjuan Han, Yanbo Zhang, Dongxing Guo
BACKGROUD: To assess the diagnostic performance of transient elastography (TE) in detecting the presence and size of esophageal varices (EV) in cirrhotic patients. METHODS: We searched PubMed, Web of Science, Wiley Online Library, Science Direct, China National Knowledge Infrastructure, WeiPu, WanFang database, and Baidu Scholar to identify studies that evaluated the diagnostic accuracy of TE in liver stiffness measurement, compared with esophagogastroduodenoscopy (EGD), for the detection of the presence and degree of EV in cirrhosis...
July 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29995500/liver-mr-elastography-at-3-t-agreement-across-pulse-sequences-and-effect-of-liver-r2-on-image-quality
#16
Ely R Felker, Kang-Sun Choi, Kyung Sung, Holden H Wu, Steven S Raman, Bradley D Bolster, Stephan Kannengiesser, Kari Sorge, David S K Lu
OBJECTIVE: The objectives of our study were to compare MR elastography (MRE) based on gradient-recalled echo (GRE) imaging with spin-echo echo-planar imaging (SEEPI) and rapid fractional (RF)-GRE MRE sequences at 3 T in terms of liver stiffness (LS) and image quality and to evaluate the effect of liver R2* on image quality. MATERIALS AND METHODS: Eighty-one patients underwent 3-T liver MRE with GRE, SE-EPI, and RF-GRE sequences performed in variable order in this study...
July 11, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29994706/assessment-of-carotid-artery-plaque-components-with-machine-learning-classification-using-homodyned-k-parametric-maps-and-elastograms
#17
Marie-Helene Roy-Cardinal, Francois Destrempes, Gilles Soulez, Guy Cloutier
Quantitative ultrasound (QUS) imaging methods including elastography, echogenicity analysis and speckle statistical modeling are available from a single ultrasound radiofrequency data acquisition. Since these ultrasound imaging methods provide complementary quantitative tissue information, characterization of carotid artery plaques may gain from their combination. Sixty-six patients with symptomatic (n=26) and asymptomatic (n=40) carotid atherosclerotic plaques were included in the study. Of these, 31 underwent magnetic resonance imaging (MRI) to characterize plaque vulnerability and quantify plaque components...
June 29, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994521/robust-reconstruction-of-elasticity-using-ultrasound-imaging-and-multi-frequency-excitations
#18
Corin F Otesteanu, Sergio J Sanabria, Orcun Goksel
Biomedical parameters of tissue can be important indicators for clinical diagnosis. One such parameter that reflects tissue stiffness is elasticity, the imaging of which is called elastography. In this work, we use displacements from harmonic excitations to solve the inverse problem of elasticity based on a finite element method (FEM) formulation. This leads to iterative solution of nonlinear and nonconvex problems. In this paper we show the importance and selection of viable initializations in numerical simulation studies, and propose techniques for the fusion of multiple initializations for ideal reconstructions of unknown tissue as well as combining information from excitations at multiple frequencies...
May 16, 2018: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/29994473/3-d-single-breath-hold-shear-strain-estimation-for-improved-breast-lesion-detection-and-classification-in-automated-volumetric-ultrasound-scanners
#19
Gijs A G M Hendriks, Chuan Chen, Hendrik H G Hansen, Chris L de Korte
Automated breast volume scanner (ABVS) is an ultrasound imaging modality used in breast cancer screening. It has high sensitivity but limited specificity as it is hard to discriminate between benign and malignant lesions by echogenic properties. Specificity might be improved by shear strain imaging as malignant lesions, firmly-bonded to its host tissue, show different shear patterns compared to benign lesions, often loosely-bonded. Therefore, 3-D quasi-static elastography was implemented in an ABVS-like system...
June 22, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994472/a-model-based-approach-to-investigate-the-effect-of-a-long-bone-fracture-on-ultrasound-strain-elastography
#20
Songyuan Tang, Eric P Sabonghy, Anuj Chaudhry, Peer Shafeeq Shajudeen, Md Tauhidul Islam, Namhee Kim, Fernando J Cabrera, J N Reddy, Ennio Tasciotti, Raffaella Righetti
The mechanical behavior of long bones and fractures has been under investigation for many decades due to its complexity and clinical relevance. In this paper, we report a new subject-specific methodology to predict and analyze the mechanical behavior of the soft tissue at a bone interface with the intent of identifying the presence and location of bone abnormalities with high accuracy, spatial resolution and contrast. The proposed methodology was tested on both intact and fractured rabbit femur samples with finite element-based 3-D simulations, created from actual femur computed tomography (CT) data, and ultrasound elastography experiments...
June 25, 2018: IEEE Transactions on Medical Imaging
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