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ultrasound elastography

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https://www.readbyqxmd.com/read/28435467/ultrasound-elastography-review-of-techniques-and-clinical-applications
#1
REVIEW
Rosa M S Sigrist, Joy Liau, Ahmed El Kaffas, Maria Cristina Chammas, Juergen K Willmann
Elastography-based imaging techniques have received substantial attention in recent years for non-invasive assessment of tissue mechanical properties. These techniques take advantage of changed soft tissue elasticity in various pathologies to yield qualitative and quantitative information that can be used for diagnostic purposes. Measurements are acquired in specialized imaging modes that can detect tissue stiffness in response to an applied mechanical force (compression or shear wave). Ultrasound-based methods are of particular interest due to its many inherent advantages, such as wide availability including at the bedside and relatively low cost...
2017: Theranostics
https://www.readbyqxmd.com/read/28433440/spatial-compounding-technique-to-obtain-rotation-elastogram-a-feasibility-study
#2
AliArshad Kothawala, Sowmiya Chandramoorthi, N Ravi Kiran Reddy, Arun Kumar Thittai
The perception of stiffness and slipperiness of a breast mass on palpation is used by physicians to assess the level of suspicion of a lesion as being malignant or benign. However, most current ultrasound elastography imaging methods provide only stiffness-related information. There is no existing approach that provides information about the local rigid body rotation undergone by only a loosely bonded, asymmetrically oriented lesion subjected to a small quasi-static compression. The inherent poor lateral resolution in ultrasound imaging poses a limitation in estimating the local rigid body rotation...
April 19, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28426437/supersonic-transient-magnetic-resonance-elastography-for-quantitative-assessment-of-tissue-elasticity
#3
Yu Liu, Jingfei Liu, Brett Z Fite, Josquin Foiret, Asaf Ilovitsh, J Kent Leach, Erik Dumont, Charles F Caskey, Katherine W Ferrara
Non-invasive, quantitative methods to assess the properties of biological tissues are needed for many therapeutic and tissue engineering applications. Magnetic resonance elastography (MRE) has historically relied on external vibration to generate periodic shear waves. In order to focally assess a biomaterial or to monitor the response to ablative therapy, the interrogation of a specific region of interest by a focused beam is desirable and transient MRE (t-MRE) techniques have previously been developed to accomplish this goal...
April 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28419634/contrast-enhanced-ultrasound-and-elastography-imaging-of-the-neonatal-brain-a-review
#4
REVIEW
Christopher Bailey, Thierry A G M Huisman, Robert M de Jong, Misun Hwang
Neonates presenting with neurologic symptoms require rapid, noninvasive imaging with high spatial resolution and tissue contrast. Magnetic resonance imaging (MRI) is currently the most sensitive and specific imaging modality for evaluation of neurological pathology. This modality does come with several challenges in the neonatal population, namely, the need to transport a possibly critically sick neonate to the MRI suite and the necessity of the neonate to remain still for a significant length of time, occasionally requiring sedation...
April 17, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28417472/evaluation-of-liver-kidney-and-spleen-elasticity-in-healthy-newborns-and-infants-using-shear-wave-elastography
#5
Figen Bakirtas Palabiyik, Ercan Inci, Rustu Turkay, Derya Bas
OBJECTIVES: Elasticity measurements of tissues can be valuable in the diagnosis and management of various diseases. The aim of this study was to determine the elasticity values for normal liver, kidney, and spleen of healthy newborns and infants using shear wave elastography (SWE) imaging. METHODS: A total of 50 healthy term newborns and infants (19 girls and 31 boys; mean age 20.1 days, range 1 to 70 days) were examined by an experienced pediatric radiologist using SWE...
April 18, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28415140/imaging-modalities-for-characterising-focal-pancreatic-lesions
#6
REVIEW
Lawrence Mj Best, Vishal Rawji, Stephen P Pereira, Brian R Davidson, Kurinchi Selvan Gurusamy
BACKGROUND: Increasing numbers of incidental pancreatic lesions are being detected each year. Accurate characterisation of pancreatic lesions into benign, precancerous, and cancer masses is crucial in deciding whether to use treatment or surveillance. Distinguishing benign lesions from precancerous and cancerous lesions can prevent patients from undergoing unnecessary major surgery. Despite the importance of accurately classifying pancreatic lesions, there is no clear algorithm for management of focal pancreatic lesions...
April 17, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28413350/mechanics-of-ultrasound-elastography
#7
REVIEW
Guo-Yang Li, Yanping Cao
Ultrasound elastography enables in vivo measurement of the mechanical properties of living soft tissues in a non-destructive and non-invasive manner and has attracted considerable interest for clinical use in recent years. Continuum mechanics plays an essential role in understanding and improving ultrasound-based elastography methods and is the main focus of this review. In particular, the mechanics theories involved in both static and dynamic elastography methods are surveyed. They may help understand the challenges in and opportunities for the practical applications of various ultrasound elastography methods to characterize the linear elastic, viscoelastic, anisotropic elastic and hyperelastic properties of both bulk and thin-walled soft materials, especially the in vivo characterization of biological soft tissues...
March 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28410100/estimation-of-strain-elastography-from-ultrasound-radio-frequency-data-by-utilizing-analytic-gradient-of-the-similarity-metric
#8
Mona Omidyeganeh, Yiming Xiao, M Omair Ahmad, Hassan Rivaz
Most strain imaging techniques follow a pipeline strategy: in the first step tissue displacement is estimated from radio-frequency (RF) frames, and in the second step, a spatial derivative operation is applied. There are two main issues that arise from this framework. First, the gradient operation amplifies noise, and therefore, smoothing techniques have to be adopted. Second, strain estimation does not exploit the original RF data. It rather relies solely on the noisy displacement field. In this paper, a novel technique is proposed that utilizes both the displacement field and the RF frames to accurately obtain the strain estimates...
April 6, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28408062/novel-method-for-vessel-cross-sectional-shear-wave-imaging
#9
Qiong He, Guo-Yang Li, Fu-Feng Lee, Qihao Zhang, Yanping Cao, Jianwen Luo
Many studies have investigated the applications of shear wave imaging (SWI) to vascular elastography, mainly on the longitudinal section of vessels. It is important to investigate SWI in the arterial cross section when evaluating anisotropy of the vessel wall or complete plaque composition. Here, we proposed a novel method based on the coordinate transformation and directional filter in the polar coordinate system to achieve vessel cross-sectional shear wave imaging. In particular, ultrasound radiofrequency data were transformed from the Cartesian to the polar coordinate system; the radial displacements were then estimated directly...
April 10, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28407655/efsumb-guidelines-and-recommendations-on-the-clinical-use-of-liver-ultrasound-elastography-update-2017-long-version
#10
Christoph F Dietrich, Jeffrey Bamber, Annalisa Berzigotti, Simona Bota, Vito Cantisani, Laurent Castera, David Cosgrove, Giovanna Ferraioli, Mireen Friedrich-Rust, Odd Helge Gilja, Ruediger Stephan Goertz, Thomas Karlas, Robert de Knegt, Victor de Ledinghen, Fabio Piscaglia, Bogdan Procopet, Adrian Saftoiu, Paul S Sidhu, Ioan Sporea, Maja Thiele
We present here the first update of the 2013 EFSUMB (European Federation of Societies for Ultrasound in Medicine and Biology) Guidelines and Recommendations on the clinical use of elastography, focused on the assessment of diffuse liver disease. The first part (long version) of these Guidelines and Recommendations deals with the basic principles of elastography and provides an update of how the technology has changed. The practical advantages and disadvantages associated with each of the techniques are described, and guidance is provided regarding optimization of scanning technique, image display, image interpretation, reporting of data and some of the known image artefacts...
April 13, 2017: Ultraschall in der Medizin
https://www.readbyqxmd.com/read/28407654/efsumb-guidelines-and-recommendations-on-the-clinical-use-of-liver-ultrasound-elastography-update-2017-short-version
#11
Christoph F Dietrich, Jeffrey Bamber, Annalisa Berzigotti, Simona Bota, Vito Cantisani, Laurent Castera, David Cosgrove, Giovanna Ferraioli, Mireen Friedrich-Rust, Odd Helge Gilja, Ruediger Stephan Goertz, Thomas Karlas, Robert de Knegt, Victor de Ledinghen, Fabio Piscaglia, Bogdan Procopet, Adrian Saftoiu, Paul S Sidhu, Ioan Sporea, Maja Thiele
We present here the first update of the 2013 EFSUMB (European Federation of Societies for Ultrasound in Medicine and Biology) Guidelines and Recommendations on the clinical use of elastography with a focus on the assessment of diffuse liver disease. The short version provides clinical information about the practical use of elastography equipment and interpretation of results in the assessment of diffuse liver disease and analyzes the main findings based on published studies, stressing the evidence from meta-analyses...
April 13, 2017: Ultraschall in der Medizin
https://www.readbyqxmd.com/read/28407305/female-striated-urogenital-sphincter-contraction-measured-by-shear-wave-elastography-during-pelvic-floor-muscle-activation-proof-of-concept-and-validation
#12
Rafeef Aljuraifani, Ryan E Stafford, François Hug, Paul W Hodges
AIMS: Investigation of the function of the striated urogenital sphincter (SUS) is challenging because it is difficult to access and requires invasive measures. Ultrasound shear wave elastography (SWE) is a non-invasive real-time technique used to estimate tissue stiffness. As muscle stiffness can be used as an estimate of muscle force, SWE provides an opportunity to study contraction of the peri-urethral musculature. Validation of SWE to study SUS during functional tasks, such as pelvic floor muscle contractions, is required prior to application in clinical populations...
April 13, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28396861/non-invasive-investigations-for-the-diagnosis-of-fontan-associated-liver-disease-in-pediatric-and-adult-fontan-patients
#13
Amyna Fidai, Frederic Dallaire, Nanette Alvarez, Yvonne Balon, Robin Clegg, Michael Connelly, Frank Dicke, Deborah Fruitman, Joyce Harder, Kimberley Myers, David J Patton, Tim Prieur, Erika Vorhies, Robert P Myers, Steven R Martin, Steven C Greenway
Fontan-associated liver disease (FALD) is a serious complication related to the chronically elevated venous pressure and low cardiac output of this abnormal circulation. However, diagnostic markers for this condition are limited. We hypothesized that specific tests for fibrosis developed for other chronic liver diseases would identify a higher prevalence of FALD than ultrasound and standard laboratory tests and that identified abnormalities would correlate with time post-Fontan. In this cross-sectional study, we assessed 19 children (average age 8...
2017: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28392000/swave-imaging-of-placental-elasticity-and-viscosity-proof-of-concept
#14
Jeffrey M Abeysekera, Manyou Ma, Mehran Pesteie, Jefferson Terry, Denise Pugash, Jennifer A Hutcheon, Chantal Mayer, Lutz Lampe, Septimiu Salcudean, Robert Rohling
The placenta is the interface between the fetus and the mother and is vital for fetal development. Ultrasound elastography provides a non-invasive way to examine in vivo the stiffness of the placenta; increased stiffness has previously been linked to fetal growth restriction. This study used a previously developed dynamic elastography method, called shear wave absolute vibro-elastography, to study 61 post-delivery clinically normal placentas. The shear wave speeds in the placenta were recorded under five different low-frequency mechanical excitations...
April 6, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28383564/development-of-a-simple-noninvasive-model-to-predict-significant-fibrosis-in-patients-with-chronic-hepatitis-b-combination-of-ultrasound-elastography-serum-biomarkers-and-individual-characteristics
#15
Xin Chen, Huiying Wen, Xinyu Zhang, Changfeng Dong, Haoming Lin, Yanrong Guo, Lingbo Shan, Simin Yao, Min Yang, Xiaohua Le, Yingxia Liu
OBJECTIVES: The accurate assessment of liver fibrosis is clinically important in patients with chronic hepatitis B (CHB). Blood tests and elastography are now widely used for the noninvasive diagnosis of liver fibrosis in CHB patients. The aim of this study was to develop a new and more accurate predictive model, which combines elastography data, serum biomarkers, and individual characteristics, to discriminate between CHB patients with and without significant liver fibrosis. METHODS: Two noninvasive methods, specifically, an ultrasound elastography technique termed acoustic radiation force impulse imaging (ARFI) and a blood test, were used to assess a cohort of 345 patients (estimation group, 218 patients; validation group, 127 patients) with CHB...
April 6, 2017: Clinical and Translational Gastroenterology
https://www.readbyqxmd.com/read/28370257/assessment-of-biopsy-proven-liver-fibrosis-by-2d-shear-wave-elastography-an-individual-patient-data-based-meta-analysis
#16
Eva Herrmann, Victor de Lédinghen, Christophe Cassinotto, Winnie C-W Chu, Vivian Y-F Leung, Giovanna Ferraioli, Carlo Filice, Laurent Castera, Valérie Vilgrain, Maxime Ronot, Jérôme Dumortier, Aymeric Guibal, Stanislas Pol, Jonel Trebicka, Christian Jansen, Christian Strassburg, Rongqin Zheng, Jian Zheng, Sven Francque, Thomas Vanwolleghem, Luisa Vonghia, Emanuel K Manesis, Pavlos Zoumpoulis, Ioan Sporea, Maja Thiele, Aleksander Krag, Claude Cohen-Bacrie, Aline Criton, Joel Gay, Thomas Deffieux, Mireen Friedrich-Rust
BACKGROUND AND AIMS: 2D shear wave elastography (2D-SWE) has proven to be efficient for the evaluation of liver fibrosis in small to moderate size clinical trials. We aimed at running a larger scale meta-analysis of individual data. METHODS: Centers which have worked with Aixplorer ultrasound equipment were contacted to share their data. Retrospective statistical analysis used direct and paired receiver operating characteristic (ROC) and area under the ROC curve (AUROC) analysis accounting for random effects...
March 31, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28366710/ultrasound-shear-wave-elastography-a-novel-method-to-evaluate-bladder-pressure
#17
Renea M Sturm, Elizabeth B Yerkes, Jennifer L Nicholas, Devon Snow-Lisy, Dawn Diaz Saldano, P Lacy Gandor, Christopher G Halline, Ilina Rosoklija, Karen Rychlik, Emilie K Johnson, Earl Y Cheng
PURPOSE: Children with bladder dysfunction leading to increased storage pressure are at risk for renal deterioration. The current gold standard evaluation is urodynamics, an invasive test requiring catheterization. The aim of this study was to evaluate ultrasound shear wave elastography (SWE) as a novel means to assess bladder biomechanical properties associated with elevated bladder pressure. METHODS: Concurrent SWE and urodynamics were performed. Ultrasound SWE images were obtained of the anterior and posterior wall when empty, at 25, 50, 75, 100% expected bladder capacity (EBC) and end fill volume...
March 30, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28365330/differences-in-liver-stiffness-values-obtained-with-new-ultrasound-elastography-machines-and-fibroscan-a-comparative-study
#18
Fabio Piscaglia, Veronica Salvatore, Lorenzo Mulazzani, Vito Cantisani, Antonio Colecchia, Roberto Di Donato, Cristina Felicani, Alessia Ferrarini, Nesrine Gamal, Valentina Grasso, Giovanni Marasco, Elena Mazzotta, Federico Ravaioli, Giacomo Ruggieri, Ilaria Serio, Joules Fabrice Sitouok Nkamgho, Carla Serra, Davide Festi, Cosima Schiavone, Luigi Bolondi
BACKGROUND AND AIMS: Whether Fibroscan thresholds can be immediately adopted for none, some or all other shear wave elastography techniques has not been tested. The aim of the present study was to test the concordance of the findings obtained from 7 of the most recent ultrasound elastography machines with respect to Fibroscan. METHODS: Sixteen hepatitis C virus-related patients with fibrosis ≥2 and having reliable results at Fibroscan were investigated in two intercostal spaces using 7 different elastography machines...
March 10, 2017: Digestive and Liver Disease
https://www.readbyqxmd.com/read/28358677/ultrafast-synthetic-transmit-aperture-imaging-usta-using-hadamard-encoded-virtual-sources-with-overlapping-sub-apertures
#19
Ping Gong, Pengfei Song, Shigao Chen
The development of ultrafast ultrasound imaging offers great opportunities to improve imaging technologies such as shear wave elastography and ultrafast Doppler imaging. In Ultrafast imaging, there are trade-offs among image signal-to-noise ratio (SNR), resolution, and post-compounded frame rate. Various approaches have been proposed to solve this trade-off such as multiplane wave imaging or the attempts of implementing synthetic transmit aperture imaging. In this paper, we propose an Ultrafast Synthetic Transmit Aperture (USTA) imaging technique using Hadamard-encoded virtual sources with overlapping sub-apertures to enhance both image SNR and resolution without sacrificing frame rate...
March 24, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28344811/the-role-of-imaging-in-the-diagnosis-of-primary-prostate-cancer
#20
Hugh Harvey, Nandita M deSouza
Ultrasound and magnetic resonance imaging (MRI) are key imaging modalities in prostate cancer diagnosis. MRI offers a range of intrinsic contrast mechanisms (T2, diffusion-weighted imaging (DWI), MR spectroscopy (MRS)) and extrinsic contrast-generating options based on tumour vascular state following injection of weakly paramagnetic agents such as gadolinium. Together these parameters are referred to as multiparametric (mp)MRI and are used for detecting and guiding biopsy and staging prostate cancer. Although sensitivity of mpMRI is <75% for disease detection, specificity is >90% and a standardised reporting system together with MR-guided targeted biopsy is the optimal diagnostic pathway...
December 2016: Journal of Clinical Urology
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