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ultrasound elastography

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https://www.readbyqxmd.com/read/28644804/global-time-delay-estimation-in-ultrasound-elastography
#1
Hoda S Hashemi, Hassan Rivaz
A critical step in quasi-static ultrasound elastography is estimation of time-delay between two frames of radiofrequency (RF) data that are obtained while the tissue is undergoing deformation. This paper presents a novel technique for timedelay estimation (TDE) of all samples of RF data simultaneously, thereby exploiting all the information in RF data for TDE. A nonlinear cost function that incorporates similarity of RF data intensity and prior information of displacement continuity is formulated. Optimization of this function involves searching for TDE of all samples of the RF data, rendering the optimization intractable with conventional techniques given that the number of variables can be approximately one million...
June 21, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28639927/carotid-artery-plaque-vulnerability-assessment-using-noninvasive-ultrasound-elastography-validation-with-mri
#2
Marie-Hélène Roy Cardinal, Maarten H G Heusinkveld, Zhao Qin, Richard G P Lopata, Cyrille Naim, Gilles Soulez, Guy Cloutier
OBJECTIVE: Vulnerable and nonvulnerable carotid artery plaques have different tissue morphology and composition that may affect plaque biomechanics. The objective of this study is to evaluate plaque vulnerability with the use of ultrasound noninvasive vascular elastography (NIVE). MATERIALS AND METHODS: Thirty-one patients (mean [± SD] age, 69 ± 7 years) with stenosis of the internal carotid artery of 50% or greater were enrolled in this cross-sectional study...
July 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28639099/erratum-to-intravascular-ultrasound-elastography-analysis-of-the-elastic-mechanical-properties-of-atherosclerotic-plaque
#3
Zhaohuan Li, Lin Wang, Xiaobo Hu, Pengfei Zhang, Yifei Chen, Xinxin Liu, Mingjun Xu, Haijun Su, Mei Zhang
No abstract text is available yet for this article.
June 21, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28634041/a-machine-learning-algorithm-toward-color-analysis-for-chronic-liver-disease-classification-employing-ultrasound-shear-wave-elastography
#4
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
#5
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/28624301/ultrasound-elastography-with-imaging-overcoming-emerging-technology-reimbursement%C3%A2-challenges
#6
Courtney C Moreno, Nikhar Kinger, Pardeep K Mittal, James Spivey, Deborah A Baumgarten, Richard Duszak
No abstract text is available yet for this article.
June 14, 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/28618301/noninvasive-measurement-of-wave-speed-of-porcine-cornea-in-ex-vivo-porcine-eyes-for-various-intraocular-pressures
#7
Boran Zhou, Arthur J Sit, Xiaoming Zhang
The objective of this study was to extend an ultrasound surface wave elastography (USWE) technique for noninvasive measurement of ocular tissue elastic properties. In particular, we aim to establish the relationship between the wave speed of cornea and the intraocular pressure (IOP). Normal ranges of IOP are between 12 and 22mmHg. Ex vivo porcine eye balls were used in this research. The porcine eye ball was supported by the gelatin phantom in a testing container. Some water was pour into the container for the ultrasound measurement...
June 7, 2017: Ultrasonics
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
#8
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/28603783/the-future-of-liver-elastography-in-the-field-of-hepatology
#9
EDITORIAL
Ioan Sporea
Ultrasound-based liver elastography is being increasingly used in clinical practice to help clinicians assess prognosis and recommend the most appropriate treatment in hepatology patients. In coming years liver elastography will probably be increasingly used as part of "point of care" ultrasonography.
April 2017: Ultrasound International Open
https://www.readbyqxmd.com/read/28599685/diagnostic-accuracy-of-sonoelastography-in-the-non-invasive-diagnosis-of-malignant-breast-cancer-compared-to-histopathology-as-a-gold-standard
#10
Hina Rehman, Saleem Raza, Sadaf Aziz, Asad Maqbool Ahmad, Sadia Tahir
OBJECTIVE: To observe the diagnostic accuracy of elastography in detecting malignant breast lesion taking strain ratio of 4.8 and histopathology as gold standard. STUDY DESIGN: Descriptive cross-sectional study. PLACE AND DURATION OF STUDY: Department of Diagnostic Radiology, from March to September 2015. METHODOLOGY: Atotal of 137 patients aged 20 to 60 years with clinically palpable breast lump of any size for at least one month duration were included in this study...
May 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28596561/a-risk-model-based-on-ultrasound-ultrasound-elastography-and-histologic-parameters-for-predicting-axillary-lymph-node-metastasis-in-breast-invasive-ductal-carcinoma
#11
Xiao-Long Li, Hui-Xiong Xu, Dan-Dan Li, Ya-Ping He, Wen-Wen Yue, Jun-Mei Xu, Bo-Ji Liu, Li-Ping Sun, Lin Fang
To develop a risk model for predicting axillary lymph node metastasis (LNM) in patients with breast invasive ductal carcinoma (IDCs) using ultrasound (US), US elastography of virtual touch tissue imaging (VTI) and virtual touch tissue imaging & quantification (VTIQ), and histologic parameters. This study included 162 breast IDCs in 162 patients. Univariate and multivariate analyses were used to identify the risk factors and a risk model was created. The results found that 64 (39.5%) of 162 patients had axillary LNMs...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28595851/delineation-of-post-procedure-ablation-regions-with-electrode-displacement-elastography-with-a-comparison-to-acoustic-radiation-force-impulse-imaging
#12
Wenjun Yang, Tomy Varghese, Timothy Ziemlewicz, Marci Alexander, Meghan Lubner, James Louis Hinshaw, Shane Wells, Fred T Lee
We compared a quasi-static ultrasound elastography technique, referred to as electrode displacement elastography (EDE), with acoustic radiation force impulse imaging (ARFI) for monitoring microwave ablation (MWA) procedures on patients diagnosed with liver neoplasms. Forty-nine patients recruited to this study underwent EDE and ARFI with a Siemens Acuson S2000 system after an MWA procedure. On the basis of visualization results from two observers, the ablated region in ARFI images was recognizable on 20 patients on average in conjunction with B-mode imaging, whereas delineable ablation boundaries could be generated on 4 patients on average...
June 5, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28593005/real-time-elastography-in-crohn-s-disease-feasibility-in-daily-clinical-practice
#13
Andrea Giannetti, Marco Matergi, Marco Biscontri, Francesco Tedone, Lucia Falconi, Luca Franci
Ultrasound (US) is the first-line investigation in patients with abdominal symptoms and it has a role in the diagnosis and monitoring of inflammatory bowel diseases. Strain elastography (SE) is a US method for estimating tissue elasticity. This method is still not routinely used in clinical practice, although it is suggested by the EFSUMB Guidelines for the characterization of intestinal stenosis in Crohn's disease. The purpose of this Pictorial Essay is to confirm the feasibility of elastography in Crohn's disease in clinical practice by comparing elastography images with corresponding endoscopic or radiological images...
June 2017: Journal of Ultrasound
https://www.readbyqxmd.com/read/28592025/-comparison-of-two-quantitative-methods-of-endobronchial-ultrasound-real-time-elastography-for-evaluating-intrathoracic-lymph-nodes
#14
X W Mao, J Y Yang, X X Zheng, L Wang, L Zhu, Y Li, H K Xiong, J Y Sun
Objective: To compare the clinical value of two quantitative methods in analyzing endobronchial ultrasound real-time elastography (EBUS-RTE) images for evaluating intrathoracic lymph nodes. Methods: From January 2014 to April 2014, EBUS-RTE examination was performed in patients who received EBUS-TBNA examination in Shanghai Chest Hospital. Each intrathoracic lymph node had a selected EBUS-RTE image. Stiff area ratio and mean hue value of region of interest (ROI) in each image were calculated respectively. The final diagnosis of lymph node was based on the pathologic/microbiologic results of EBUS-TBNA, pathologic/microbiologic results of other examinations and clinical following-up...
June 12, 2017: Chinese Journal of Tuberculosis and Respiratory Diseases
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
#15
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
#16
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/28585511/three-dimensional-ultrasound-elasticity-imaging-on-an-automated-breast-volume-scanning-system
#17
Yuqi Wang, Haidy G Nasief, Sarah Kohn, Andy Milkowski, Tom Clary, Stephen Barnes, Paul E Barbone, Timothy J Hall
Ultrasound elasticity imaging has demonstrated utility in breast imaging, but it is typically performed with handheld transducers and two-dimensional imaging. Two-dimensional (2D) elastography images tissue stiffness of only a plane and hence suffers from errors due to out-of-plane motion, whereas three-dimensional (3D) data acquisition and motion tracking can be used to track out-of-plane motion that is lost in 2D elastography systems. A commercially available automated breast volume scanning system that acquires 3D ultrasound data with precisely controlled elevational movement of the 1D array ultrasound transducer was employed in this study...
June 1, 2017: Ultrasonic Imaging
https://www.readbyqxmd.com/read/28583530/increased-stiffness-of-the-remnant-right-lobe-liver-after-left-lobectomy-or-lateral-segmentectomy-in-donors-of-living-donor-liver-transplantation
#18
H-K Wang, Y-C Lai, Y-H Lin, H-J Chiou, Y-H Chou
BACKGROUND: Liver stiffness is associated with the degree of fibrosis along with other factors. Abrupt change of liver perfusion after hepatectomy is one such factor. In this study, we performed ultrasound elastography to explore the stiffness of the right lobe liver before and after hepatectomy in donors who underwent resection of left lobe or lateral segment of liver. METHODS: A total of 32 left lobe liver donors (18 male and 14 female; age range, 21-55 years; mean age, 35...
June 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28578837/coffee-and-herbal-tea-consumption-is-associated-with-lower-liver-stiffness-in-the-general-population-the-rotterdam-study
#19
Louise J M Alferink, Juliana Fittipaldi, Jessica C Kiefte-de Jong, Pavel Taimr, Bettina E Hansen, Herold J Metselaar, Josje D Schoufour, M Arfan Ikram, Harry L A Janssen, Oscar H Franco, Sarwa Darwish Murad
BACKGROUND & AIMS: Coffee and tea have been proposed to limit the progression of liver fibrosis in established liver disease, but it is unknown if this is also true for subclinical fibrosis. We therefore aimed to evaluate whether coffee and tea consumption are associated with liver stiffness in the general population. METHODS: The Rotterdam Study is an ongoing prospective population-based cohort. We included participants who underwent transient elastography, ultrasound and completed a food frequency questionnaire...
May 21, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28564643/prevent-pancreatic-fistula-after-pancreatoduodenectomy-possible-role-of-ultrasound-elastography
#20
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
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