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Shear-wave elastography

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https://www.readbyqxmd.com/read/28922441/evaluation-of-2d-shear-wave-elastography-for-characterisation-of-focal-liver-lesions
#1
Ludmila Gerber, Daniel Fitting, Kajana Srikantharajah, Nina Weiler, Georgia Kyriakidou, Joerg Bojunga, Falko Schulze, Dimitra Bon, Stefan Zeuzem, Mireen Friedrich-Rust
BACKGROUND AND AIM: This is a prospective study for evaluation of 2D-shear wave elastography (2D-SWE) for characterisation and differentiation of benign und malignant focal liver lesions (FLLs). METHODS: The patients referred to our ultrasound unit were prospectively included. B-mode ultrasound and 2D-SWE (Aixplorer® France) were performed for one FLL in each patient. Liver histology and/or contrast-enhanced imaging were used as a reference method. RESULTS: 140 patients with FLL were included...
September 2017: Journal of Gastrointestinal and Liver Diseases: JGLD
https://www.readbyqxmd.com/read/28919161/magnetic-resonance-elastography-of-the-brain-a-comparison-between-pigs-and-humans
#2
Johannes Weickenmeier, Mehmet Kurt, Efe Ozkaya, Max Wintermark, Kim Butts Pauly, Ellen Kuhl
Magnetic resonance elastography holds promise as a non-invasive, easy-to-use, in vivo biomarker for neurodegenerative diseases. Throughout the past decade, pigs have gained increased popularity as large animal models for human neurodegeneration. However, the volume of a pig brain is an order of magnitude smaller than the human brain, its skull is 40% thicker, and its head is about twice as big. This raises the question to which extent established vibration devices, actuation frequencies, and analysis tools for humans translate to large animal studies in pigs...
August 26, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28906009/does-lesion-size-affect-the-value-of-shear-wave-elastography-for-differentiating-between-benign-and-malignant-thyroid-nodules
#3
Fen Wang, Cai Chang, Min Chen, Yi Gao, Ya-Ling Chen, Shi-Chong Zhou, Jia-Wei Li, Wen-Xiang Zhi
OBJECTIVES: We aimed to investigate the diagnostic performance of shear wave elastography (SWE) combined with conventional ultrasonography (US) for differentiating between benign and malignant thyroid nodules of different sizes. METHODS: A total of 445 thyroid nodules from 445 patients were divided into 3 groups based on diameter (group 1, ≤ 10 mm; group 2, 10-20 mm; and group 3, > 20 mm). The mean elasticity index of the whole lesion was automatically calculated, and the threshold for differentiation between benign and malignant nodules was constructed by a receiver operating characteristic curve analysis...
September 14, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28905143/the-value-of-quantitative-shear-wave-elastography-in-differentiating-the-cervical-lymph-nodes-in-patients-with-thyroid-nodules
#4
Jun You, Juan Chen, Feixiang Xiang, Yue Song, Simai Khamis, Chengfa Lu, Qing Lv, Yanrong Zhang, Mingxing Xie
PURPOSE: This study aimed at evaluating the diagnostic performance of quantitative shear wave elastography (SWE) in differentiating metastatic cervical lymph nodes from benign nodes in patients with thyroid nodules. METHODS: One hundred and forty-one cervical lymph nodes from 39 patients with thyroid nodules that were diagnosed as papillary thyroid cancer had been imaged with SWE. The shear elasticity modulus, which indicates the stiffness of the lymph nodes, was measured in terms of maximum shear elasticity modulus (maxSM), minimum shear elasticity modulus (minSM), mean shear elasticity modulus (meanSM), and standard deviation (SD) of the shear elasticity modulus...
September 13, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28900767/quantitative-assessment-of-muscular-stiffness-in-children-with-cerebral-palsy-using-acoustic-radiation-force-impulse-arfi-ultrasound-elastography
#5
Meltem Ceyhan Bilgici, Tumay Bekci, Yasemin Ulus, Hamit Ozyurek, Omer Faruk Aydin, Leman Tomak, Mustafa Bekir Selcuk
PURPOSE: To evaluate the feasibility of quantitative analysis of muscle stiffness in the medial gastrocnemius muscle (GCM) by acoustic radiation force impulse (ARFI) ultrasound elastography in children with spastic cerebral palsy (CP). METHODS: Seventeen children with spastic CP and 25 healthy children participated in the study between the years 2016-2017. The medial GCM in the CP group was assessed using the Modified Ashworth Scale (MAS) by a physiatrist. ARFI was used to measure the shear-wave velocities (SWVs) of the medial GCM...
September 12, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28900566/transversus-abdominis-elasticity-during-various-exercises-a-shear-wave-ultrasound-elastography-study
#6
Kuniaki Hirayama, Ryota Akagi, Yuki Moniwa, Junichi Okada, Hideyuki Takahashi
BACKGROUND: Although the transversus abdominis (TrA) is considered to play a significant role in maintaining trunk stability, there is little information regarding the type of exercise that best facilitates the development of tension in the TrA. Muscle elasticity shows a strong association with muscle tension. Shear wave ultrasound elastography provides a means by which the tension of TrA can be noninvasively estimated, by quantifying it's elasticity. PURPOSE: The purpose of this study was to examine the TrA elasticity during several exercises as measured by shear wave ultrasound elastography, and to determine which of the studied exercises demonstrated the greatest tension...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900522/point-shear-wave-ultrasound-elastography-with-esaote-compared-to-real-time-2d-shear-wave-elastography-with-supersonic-imagine-for-the-quantification-of-liver-stiffness
#7
L Mulazzani, V Salvatore, F Ravaioli, G Allegretti, F Matassoni, R Granata, A Ferrarini, H Stefanescu, Fabio Piscaglia
PURPOSE: Different shear wave elastography (SWE) machines able to quantify liver stiffness (LS) have been recently introduced by various companies. The aim of this study was to investigate the agreement between point SWE with Esaote MyLab Twice (pSWE.ESA) and 2D SWE with Aixplorer SuperSonic (2D SWE.SSI). Moreover, we assessed the correlation of these machines with Fibroscan in a subgroup of patients. METHODS: A total of 81 liver disease patients and 27 subjects without liver disease accessing the ultrasound lab were considered...
September 2017: Journal of Ultrasound
https://www.readbyqxmd.com/read/28899126/impact-of-region-of-interest-roi-size-on-the-diagnostic-performance-of-shear-wave-elastography-in-differentiating-solid-breast-lesions
#8
Jin Hee Moon, Ji-Young Hwang, Jeong Seon Park, Sung Hye Koh, Sun-Young Park
Background Shear wave elastography (SWE) using a region of interest (ROI) can demonstrate the quantitative elasticity of breast lesions. Purpose To prospectively evaluate the impact of two different ROI sizes on the diagnostic performance of SWE for differentiating benign and malignant breast lesions. Material and Methods A total of 154 breast lesions were included. Two types of ROIs were investigated: one involving an approximately 2-mm diameter, small round ROIs placed over the stiffest area of the lesion, as determined by SWE (ROI-S); and another ROI drawn along the margin of the lesion using a touch pen or track ball to encompass the entire lesion (ROI-M)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28891995/performance-study-of-a-torsional-wave-sensor-and-cervical-tissue-characterization
#9
Antonio Callejas, Antonio Gomez, Juan Melchor, Miguel Riveiro, Paloma Massó, Jorge Torres, Modesto T López-López, Guillermo Rus
A novel torsional wave sensor designed to characterize mechanical properties of soft tissues is presented in this work. Elastography is a widely used technique since the 1990s to map tissue stiffness. Moreover, quantitative elastography uses the velocity of shear waves to achieve the shear stiffness. This technique exhibits significant limitations caused by the difficulty of the separation between longitudinal and shear waves and the pressure applied while measuring. To overcome these drawbacks, the proposed torsional wave sensor can isolate a pure shear wave, avoiding the possibility of multiple wave interference...
September 11, 2017: Sensors
https://www.readbyqxmd.com/read/28885209/investigation-of-the-acute-plantar-fasciitis-with-contrast-enhanced-ultrasound-and-shear-wave-elastography-first-results
#10
Franz Josef Putz, Matthias G Hautmann, Miriam Banas, Ernst Michael Jung
BACKGROUND: The plantar fasciitis is a common disease with a high prevalence in public and a frequent cause of heel pain. OBJECTIVE: In our pilot study, we wanted to characterise the feasibility of shear-wave elastography and contrast-enhanced ultrasound (CEUS) in the assessment of the plantar fasciitis. METHODS: 23 cases of painful heels were examined by B-Mode ultrasound, Power Doppler (PD), shear wave elastography and contrast-enhanced ultrasound before anti-inflammatory radiation...
September 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28882058/role-of-acoustic-radiation-force-impulse-and-shear-wave-velocity-in-prediction-of-preterm-birth-a-prospective-study
#11
Arjit Agarwal, Shubhra Agarwal, Shruti Chandak
Background Preterm birth is one of the important causes of neonatal morbidity where we rely on subjective criteria such as modified Bishop's scoring and contemporary sonographic measurement of cervical length. Acoustic radiation force impulse (ARFI) is a technological advancement in elastography that can be employed in prediction of cervical softening and preterm labor. Purpose To evaluate the role of ARFI technique and shear wave velocity (SWV) estimates as a predictor of preterm birth and its comparison with other clinical and sono-elastographic measures...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28871805/acoustic-radiation-force-impulse-elastography-in-determining-the-effects-of-type-1-diabetes-on-pancreas-and-kidney-elasticity-in-children
#12
Dilek Sağlam, Meltem Ceyhan Bilgici, Cengiz Kara, Gülay Can Yılmaz, İlkay Çamlıdağ
OBJECTIVE: The aim of this study is to determine the effects of type 1 diabetes on pancreas and kidney elasticity in children, using acoustic radiation force impulse ultrasound elastography. SUBJECTS AND METHODS: Sixty autoantibody-positive patients with type 1 diabetes (45% girls; mean [± SD] age, 11.7 ± 4.4 years; range, 1.9-19.3 years) admitted to the pediatric endocrinology outpatient clinic and 32 healthy children (50% girls; mean age, 10.2 ± 3.8 years; range, 2...
September 5, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28866442/passive-material-properties-of-stroke-impaired-plantarflexor-and-dorsiflexor-muscles
#13
Kristen L Jakubowski, Ada Terman, Ricardo V C Santana, Sabrina S M Lee
BACKGROUND: Following a stroke, intrinsic muscle properties such as stiffness may be altered, which is accompanied by increased spasticity and contractures. Previously, quantification of muscle stiffness has been based off of indirect measurements. Using shear wave ultrasound elastography, direct measurements of muscle material properties can be made. METHODS: Our aim was to evaluate material properties, specifically passive stiffness, using shear wave ultrasound elastography across a range of muscle lengths, in the medial gastrocnemius and the tibialis anterior in chronic stroke survivors...
August 24, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28863603/modeling-of-the-acoustic-radiation-force-in-elastography
#14
Fabrice Prieur, Oleg A Sapozhnikov
Elastography is a non-invasive imaging technique that can assess in vivo tissue stiffness. In shear wave elastography imaging, the acoustic radiation force (ARF) produced by focused ultrasound generates a local force that produces shear waves. The authors compare three existing formulations for the ARF: its full expression in the second-order approximation and two simplified formulations using a quasi-plane wave and an attenuated plane wave approximation. Analytical expressions for the ARF are derived for the special cases of a concave spherical source and a quasi-Gaussian beam...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28856718/tomoelastography-of-the-native-kidney-regional-variation-and-physiological-effects-on-in-vivo-renal-stiffness
#15
Stephan Rodrigo Marticorena Garcia, Markus Grossmann, Sophia Theresa Lang, Heiko Tzschätzsch, Florian Dittmann, Bernd Hamm, Jürgen Braun, Jing Guo, Ingolf Sack
PURPOSE: To measure normal renal stiffness in adults, taking into account regional variation, hydration, and urinary status. METHODS: Thirty-six healthy volunteers were examined by tomoelastography based on MR elastography at four frequencies, from 40 to 70 Hz and multifrequency shear wave speed recovery. Regional wave speeds were derived for the medulla, cortex (inner cortex and outer cortex), and renal pelvis, and examined for age-related effects. Subgroups were repeatedly examined for reproducibility, amount of prior water drinking, and urinary status...
August 30, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28852205/probiotics-administration-following-sleeve-gastrectomy-surgery-a-randomized-double-blind-trial
#16
S Sherf-Dagan, S Zelber-Sagi, G Zilberman-Schapira, M Webb, A Buch, A Keidar, A Raziel, N Sakran, D Goitein, N Goldenberg, J A Mahdi, M Pevsner-Fischer, N Zmora, M Dori-Bachash, E Segal, E Elinav, O Shibolet
BACKGROUND: Probiotics are commonly used after bariatric surgery; however uncertainty remains regarding their efficacy. Our aim was to compare the effect of probiotics vs. placebo on hepatic, inflammatory and clinical outcomes following laparoscopic sleeve gastrectomy (LSG). METHODS: This randomized, double-blind, placebo-controlled, trial of 6-months treatment with probiotics (Bio-25;Supherb) vs. placebo and 6-months of additional follow-up was conducted among 100 morbidly obese non-alcoholic fatty liver disease (NAFLD) patients who underwent LSG surgery...
August 30, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28845158/2d-shear-wave-elastography-in-the-evaluation-of-parathyroid-lesions-in-patients-with-hyperparathyroidism
#17
Ioana Golu, Ioan Sporea, Lavinia Moleriu, Anca Tudor, Marioara Cornianu, Adrian Vlad, Romulus Timar, Melania Balas, Daniela Amzar, Mihaela Vlad
BACKGROUND AND AIMS: 2D-shear wave elastography (2D-SWE) is a relatively new elastographic technique. The aim of the present study is to determine the values of the elasticity indexes (EI) measured by 2D-SWE in parathyroid benign lesions (adenomas or hyperplasia) and to establish if this investigation is helpful for the preoperative identification of the parathyroid adenoma. MATERIAL AND METHODS: The study groups were represented by 22 patients with primary or tertiary hyperparathyroidism, diagnosed by specific tests, and 43 healthy controls, in whom the thyroid parenchyma was evaluated, in order to compare the EI of the thyroid tissue with those of the parathyroid lesions...
2017: International Journal of Endocrinology
https://www.readbyqxmd.com/read/28844464/non-invasive-assessment-of-liver-fibrosis-with-elastpq-comparison-with-transient-elastography-and-serologic-fibrosis-marker-tests-and-correlation-with-liver-pathology-results
#18
Jeong Eun Lee, Kyung Sook Shin, June-Sik Cho, Sun Kyoung You, Ji Hye Min, Kyung-Hee Kim, In Sang Song, Kwang Sik Cheon
We investigated the feasibility of using ultrasound shear wave elastography point quantification (ElastPQ) for liver fibrosis staging and compared it with other non-invasive tools with respect to efficacy in liver stiffness measurement. A total of 106 patients who underwent liver stiffness measurements, using ElastPQ and biochemical investigations, before parenchymal liver biopsy or surgery were included. Among these, 51 also underwent transient elastography (TE). Correlations of ElastPQ, TE and aspartate aminotransferase-to-platelet ratio index (APRI) with histopathological findings (as the reference standard) were determined using Spearman's correlation coefficient...
August 24, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28841869/measurements-of-the-trapezius-and-erector-spinae-muscles-using-virtual-touch-imaging-quantification-ultrasound-elastography-a-cross-section-study
#19
Anne Heizelmann, Sümeyra Tasdemir, Julian Schmidberger, Tilmann Gräter, Wolfgang Kratzer, Beate Grüner
BACKGROUND: This study uses virtual touch imaging quantification (VTIQ) technology for the first time to conduct measurements of the trapezius and erector spinae muscles in a large study population. The significance of various influencing factors, such as age and sex, are also examined. METHOD: The study population comprised 278 subjects. The Siemens Acuson S3000 and VTIQ technology were used for measurements of the trapezius and erector spinae muscles (Siemens Healthcare, Erlangen, Germany)...
August 25, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28841556/viscoelasticity-mapping-by-identification-of-local-shear-wave-dynamics
#20
Ruud Jg van Sloun, Rogier R Wildeboer, Hessel Wijkstra, Massimo Mischi
Estimation of soft tissue elasticity is of interest in several clinical applications. For instance, tumors and fibrotic lesions are notoriously stiff compared to benign tissue. A fully quantitative measure of lesion stiffness can be obtained by shear wave elastography. This method uses an acoustic radiation force to produce laterally propagating shear waves that can be tracked to obtain the velocity, which in turn is related to the Young's modulus. However, not only elasticity, but also viscosity plays an important role in the propagation process of shear waves...
August 23, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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