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Shear-wave elastography

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https://www.readbyqxmd.com/read/28634626/hepatic-shear-wave-elastography-in-children-under-free-breathing-and-breath-hold-conditions
#1
Caroline Jung, Michael Groth, Kay Uwe Petersen, Anna Hammel, Florian Brinkert, Enke Grabhorn, Sören Alexander Weidemann, Jasmin Busch, Gerhard Adam, Jochen Herrmann
OBJECTIVES: To compare hepatic 2D shear wave elastography (2D SWE) in children between free-breathing and breath-hold conditions, in terms of measurement agreement and time expenditure. METHODS: A cohort of 57 children (12.7±4.3 years) who underwent standardized 2D SWE between May and October 2015 were retrospectively evaluated. Liver elastograms were obtained under free-breathing and breath-hold conditions and time expenditure was measured. Median stiffness, interquartile range (IQR), and IQR/median ratio were calculated based on 12, six, and three elastograms...
June 20, 2017: European Radiology
https://www.readbyqxmd.com/read/28634041/a-machine-learning-algorithm-toward-color-analysis-for-chronic-liver-disease-classification-employing-ultrasound-shear-wave-elastography
#2
Ilias Gatos, Stavros Tsantis, Stavros Spiliopoulos, Dimitris Karnabatidis, Ioannis Theotokas, Pavlos Zoumpoulis, Thanasis Loupas, John D Hazle, George C Kagadis
The purpose of the present study was to employ a computer-aided diagnosis system that classifies chronic liver disease (CLD) using ultrasound shear wave elastography (SWE) imaging, with a stiffness value-clustering and machine-learning algorithm. A clinical data set of 126 patients (56 healthy controls, 70 with CLD) was analyzed. First, an RGB-to-stiffness inverse mapping technique was employed. A five-cluster segmentation was then performed associating corresponding different-color regions with certain stiffness value ranges acquired from the SWE manufacturer-provided color bar...
June 17, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28624924/evaluation-of-hepatic-fibrosis-a-review-from-the-society-of-abdominal-radiology-disease-focus-panel
#3
REVIEW
Jeanne M Horowitz, Sudhakar K Venkatesh, Richard L Ehman, Kartik Jhaveri, Patrick Kamath, Michael A Ohliger, Anthony E Samir, Alvin C Silva, Bachir Taouli, Michael S Torbenson, Michael L Wells, Benjamin Yeh, Frank H Miller
Hepatic fibrosis is potentially reversible; however early diagnosis is necessary for treatment in order to halt progression to cirrhosis and development of complications including portal hypertension and hepatocellular carcinoma. Morphologic signs of cirrhosis on ultrasound (US), computed tomography (CT), and magnetic resonance imaging (MRI) alone are unreliable and are seen with more advanced disease. Newer imaging techniques to diagnose liver fibrosis are reliable and accurate, and include magnetic resonance elastography and US elastography (one-dimensional transient elastography and point shear wave elastography or acoustic radiation force impulse imaging)...
June 17, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28617883/ruling-in-and-ruling-out-significant-fibrosis-and-cirrhosis-in-patients-with-chronic-hepatitis-c-using-a-shear-wave-measurement-method
#4
Giovanna Ferraioli, Laura Maiocchi, Raffaella Lissandrin, Carmine Tinelli, Annalisa De Silvestri, Carlo Filice
AIMS: To prospectively assess the cutoff values of a point shear wave measurement (SWM) method for ruling-in and ruling-out significant fibrosis and cirrhosis using transient elastography (TE) as the reference standard. METHOD: Consecutive patients with chronic hepatitis C were enrolled. Liver stiffness was assessed with the SWM method implemented on the HI VISION Ascendus ultrasound system (Hitachi Ltd, Japan) and with the TE method of the FibroScan® device (Echosens, France)...
June 2017: Journal of Gastrointestinal and Liver Diseases: JGLD
https://www.readbyqxmd.com/read/28614362/effect-of-pathological-heterogeneity-on-shear-wave-elasticity-imaging-in-the-staging-of-deep-venous-thrombosis
#5
Xiaona Liu, Na Li, Chaoyang Wen
BACKGROUND: We aimed to observe the relationship between the pathological components of a deep venous thrombus (DVT), which was divided into three parts, and the findings on quantitative ultrasonic shear wave elastography (SWE) to increase the accuracy of thrombus staging in a rabbit model. METHODS: A flow stenosis-induced vein thrombosis model was used, and the thrombus was divided into three parts (head, body and tail), which were associated with corresponding observation points...
2017: PloS One
https://www.readbyqxmd.com/read/28611483/longitudinal-shear-wave-imaging-for-elasticity-mapping-using-optical-coherence-elastography
#6
Jiang Zhu, Yusi Miao, Li Qi, Yueqiao Qu, Youmin He, Qiang Yang, Zhongping Chen
Shear wave measurements for the determination of tissue elastic properties have been used in clinical diagnosis and soft tissue assessment. A shear wave propagates as a transverse wave where vibration is perpendicular to the wave propagation direction. Previous transverse shear wave measurements could detect the shear modulus in the lateral region of the force; however, they could not provide the elastic information in the axial region of the force. In this study, we report the imaging and quantification of longitudinal shear wave propagation using optical coherence tomography to measure the elastic properties along the force direction...
May 15, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28609299/arterial-waveguide-model-for-shear-wave-elastography-implementation-and-in-vitro-validation
#7
Ali Vaziri Astaneh, Matthew W Urban, Wilkins Aquino, James F Greenleaf, Murthy N Guddati
Arterial stiffness is found to be an early indicator of many cardiovascular diseases. Among various techniques, shear wave elastography has emerged as a promising tool for estimating local arterial stiffness through the observed dispersion of guided waves. In this paper, we develop efficient models for the computational simulation of guided wave dispersion in arterial walls. The models are capable of considering fluid-loaded tubes, immersed in fluid or embedded in a solid, which are encountered in in vitro/ex vivo, and in vivo experiments...
July 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28607322/assessment-of-the-mechanical-properties-of-the-muscle-tendon-unit-by-supersonic-shear-wave-imaging-elastography-a-review
#8
Kelly Mônica Marinho E Lima, José Francisco Silva Costa Júnior, Wagner Coelho de Albuquerque Pereira, Liliam Fernandes de Oliveira
This review aimed to describe the state of the art in muscle-tendon unit (MTU) assessment by supersonic shear wave imaging (SSI) elastography in states of muscle contraction and stretching, during aging, and in response to injury and therapeutic interventions. A consensus exists that MTU elasticity increases during passive stretching or contraction, and decreases after static stretching, electrostimulation, massage, and dry needling. There is currently no agreement regarding changes in the MTU due to aging and injury...
April 15, 2017: Ultrasonography
https://www.readbyqxmd.com/read/28604279/diffusion-and-intravoxel-incoherent-motion-mr-imaging-based-virtual-elastography-a-hypothesis-generating-study-in-the-liver
#9
Denis Le Bihan, Shintaro Ichikawa, Utaroh Motosugi
Purpose To investigate the potential of diffusion magnetic resonance (MR) imaging to provide quantitative estimates of tissue stiffness without using mechanical vibrations in patients with chronic liver diseases and to generate a new elasticity-driven intravoxel incoherent motion (IVIM) contrast. Materials and Methods This retrospective study, conducted from January to April 2016, was approved by an institutional review board that waived the requirement for informed consent. Fifteen subjects were included (13 men and two women; mean age ± standard deviation, 73 years ± 8)...
June 12, 2017: Radiology
https://www.readbyqxmd.com/read/28598786/prevalence-and-risk-factors-for-liver-fibrosis-detected-by-transient-elastography-or-shear-wave-elastography-in-inflammatory-arthritis-a-systematic-review
#10
Azin Rouhi, Glen Hazlewood, Abdel-Aziz Shaheen, Mark G Swain, Claire E H Barber
OBJECTIVES: Emerging technologies for monitoring subclinical liver fibrosis include transient elastography (TE) and shear wave elastography (SWE). A systematic review was conducted to assess the prevalence and report on predictors of liver fibrosis as detected by these technologies in inflammatory arthritis (IA) patients, including rheumatoid arthritis, spondyloarthritis and juvenile idiopathic arthritis. METHODS: MEDLINE, EMBASE and Web of Science were searched from inception to 06/27/2016 using search terms for IA or DMARDs and TE/SWE...
June 5, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28593004/influence-of-subjects-characteristics-and-technical-variables-on-muscle-stiffness-measured-by-shear-wave-elastosonography
#11
Chandra Bortolotto, Luca Lungarotti, Ilaria Fiorina, Michela Zacchino, Ferdinando Draghi, Fabrizio Calliada
PURPOSE: The aim of this study is to quantitatively assess lower limbs muscle elasticity in a court of healthy subjects and to evaluate the influence of technical variables (e.g., diameter of the ROI-region of interest) and examined subjects' characteristics (e.g., sex, levels of physical activity, side evaluated) on muscle stiffness. MATERIALS AND METHODS: 54 healthy subjects (48 men, 6 women) were evaluated for a total of 108 lower limbs. Shear wave elastography was performed with a multifrequency linear probe (15-4 MHz)...
June 2017: Journal of Ultrasound
https://www.readbyqxmd.com/read/28586712/ultrasound-shear-wave-elastography-in-the-assessment-of-passive-biceps-brachii-muscle-stiffness-influences-of-sex-and-elbow-position
#12
Johnson Chen, Michael O'Dell, Wen He, Li-Juan Du, Pai-Chi Li, Jing Gao
OBJECTIVE: To assess differences in biceps brachii muscle (BBM) stiffness as evaluated by ultrasound shear wave elastography (SWE). METHODS: The passive stiffness of the BBM was quantified with shear wave velocity (SWV) measurements obtained from 10 healthy volunteers (5 men and 5 women, mean age 50years, age range 42-63 years) with the elbow at full extension and 30° flexion in this IRB-approved study. Potential differences between two depths within the muscle, two elbow positions, the two arms, and sexes were assessed by using two-tailed t-test...
May 31, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28586172/comparison-of-laboratory-tests-ultrasound-or-mre-to-detect-fibrosis-in-patients-with-non-alcoholic-fatty-liver-disease-a-meta-analysis
#13
Guangqin Xiao, Sixian Zhu, Xiao Xiao, Lunan Yan, Jiayin Yang, Gang Wu
Many noninvasive methods for diagnosing liver fibrosis (LF) have been proposed. To determine the best method for diagnosing LF in nonalcoholic fatty liver disease (NAFLD), we conducted a systemic review and meta-analysis to compare the performance of APRI, FIB-4, BARD score, NAFLD fibrosis score (NFS), FibroScan, shear wave elastography (SWE) and magnetic resonance elastography (MRE) for diagnosing LF in NAFLD. We compared the sensitivity, specificity, positive predictive value, negative predictive value, and AUROC of these noninvasive methods for detecting significant fibrosis (SF), advanced fibrosis (AF), and cirrhosis...
June 6, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28586157/role-of-point-shear-wave-elastography-in-the-determination-of-the-severity-of-fibrosis-in-pediatric-liver-diseases-with-pathologic-correlations
#14
Mehmet Burak Özkan, Meltem Ceyhan Bilgici, Esra Eren, Gonul Caltepe, Gulay Yilmaz, Cengiz Kara, Seda Gun
OBJECTIVES: Our aims in this study were as follows: (1) to determine the cutoff value that can distinguish between advanced liver fibrosis and normal liver tissue for two different elastographic techniques; (2) to determine the cutoff value that can distinguish mild liver fibrosis from normal liver tissue for the techniques; and (3) to assess tissue stiffness in nonalcoholic fatty liver disease (NAFLD). METHODS: Seventy-five patients assessed for liver biopsy on the same day were evaluated by point shear wave elastography...
June 6, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28585229/tomoelastography-of-the-prostate-using-multifrequency-mr-elastography-and-externally-placed-pressurized-air-drivers
#15
Florian Dittmann, Rolf Reiter, Jing Guo, Matthias Haas, Patrick Asbach, Thomas Fischer, Jürgen Braun, Ingolf Sack
PURPOSE: To demonstrate the feasibility of in vivo multifrequency magnetic resonance elastography (MRE) of the prostate using externally placed drivers. METHODS: Three pressurized-air drivers were used to excite shear waves within the prostate at vibration frequencies of 60, 70, and 80 Hz. Full 3D wave fields were acquired by multislice spin-echo echo-planar imaging in conjunction with tomoelastography wave speed recovery for generating full field-of-view stiffness maps...
June 6, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28570101/mr-elastography-demonstrates-unique-regional-brain-stiffness-patterns-in-dementias
#16
Mona ElSheikh, Arvin Arani, Avital Perry, Bradley F Boeve, Fredric B Meyer, Rodolfo Savica, Richard L Ehman, John Huston
OBJECTIVE: The purpose of this study was to investigate age-corrected brain MR elastography (MRE) findings in four dementia cohorts (Alzheimer disease, dementia with Lewy bodies, frontotemporal dementia, and normal pressure hydrocephalus) and determine the potential use as a differentiating biomarker in dementia subtypes. SUBJECTS AND METHODS: Institutional review board approval and written informed consent were obtained to perform MRE on 84 subjects: 20 patients with normal pressure hydrocephalus, eight with Alzheimer disease, five with dementia with Lewy bodies, five with frontotemporal dementia, and 46 cognitively normal control subjects...
June 1, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28569362/can-arfi-elastography-be-used-to-differentiate-parathyroid-from-thyroid-lesions
#17
A Chandramohan, M Therese, D Abhraham, T V Paul, P Jacob Mazhuvanchary
OBJECTIVES: To assess if elasticity score (ES) and shear wave velocity (SWV) measurement obtained using ARFI elastography can differentiate between parathyroid lesions and thyroid nodules. MATERIALS AND METHODS: ARFI elastography was performed on patients with primary hyperparathyroidism or solid thyroid nodules who were being considered for surgery using virtual touch quantification and virtual touch imaging (VTI) software. Only patients with surgical histopathology (47 parathyroid lesions, 38 benign thyroid nodules and 55 malignant thyroid nodules) were included for final analysis...
May 31, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28564643/prevent-pancreatic-fistula-after-pancreatoduodenectomy-possible-role-of-ultrasound-elastography
#18
Mirko D'Onofrio, Giulia Tremolada, Riccardo De Robertis, Stefano Crosara, Valentina Ciaravino, Nicolò Cardobi, Giovanni Marchegiani, Alessandra Pulvirenti, Valentina Allegrini, Roberto Salvia, Claudio Bassi, Roberto Pozzi Mucelli
BACKGROUND: The purpose of the study is to evaluate the utility of acoustic radiation force impulse (ARFI) on pancreatic tissue as a preoperative predictor of postoperative pancreatic fistula (POPF). Studied patients underwent exclusively to pancreaticoduodenectomy (PD) surgery. METHODS: Shear wave velocity of pancreas was measured using ARFI in 71 patients scheduled for PD. An intraoperative pancreas palpation was made by surgeons. A postoperative clinical evaluation to detect occurrence of POPF was performed...
June 1, 2017: Digestive Surgery
https://www.readbyqxmd.com/read/28554540/in%C3%A2-vivo-multiparametric-ultrasound-imaging-of-structural-and-functional-tumor-modifications-during-therapy
#19
Alexandre Dizeux, Thomas Payen, Delphine Le Guillou-Buffello, Eva Comperat, Jean-Luc Gennisson, Mickael Tanter, Michael Oelze, S Lori Bridal
Longitudinal imaging techniques are needed that can meaningfully probe the tumor microenvironment and its spatial heterogeneity. Contrast-enhanced ultrasound, shear wave elastography and quantitative ultrasound are ultrasound-based techniques that provide information on the vascular function and micro-/macroscopic tissue structure. Modifications of the tumor microenvironment induced by cytotoxic and anti-angiogenic molecules in ectopic murine Lewis lung carcinoma tumors were monitored. The most heterogenous structures were found in tumors treated with anti-angiogenic drug that simultaneously accumulated the highest levels of necrosis and fibrosis...
May 26, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28548237/simulation-of-non-linear-transient-elastography-finite-element-model-for-the-propagation-of-shear-waves-in-homogeneous-soft-tissues
#20
W Ye, A Bel-Brunon, S Catheline, A Combescure, M Rochette
In this study, visco-hyperelastic Landau's model which is widely used in acoustical physic field is introduced into a finite element formulation. It is designed to model the non-linear behaviour of finite amplitude shear waves in soft solids, typically, in biological tissues. This law is employed in finite element models based on elastography experiments reported in [1], the simulations results show a good agreement with the experimental studyred: it is observed in both that a plane shear wave generates only odd harmonics and a nonplane wave generates both odd and even harmonics in the spectral domain...
May 26, 2017: International Journal for Numerical Methods in Biomedical Engineering
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