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Shear wave

Maud Creze, Antoine Nordez, Marc Soubeyrand, Laurence Rocher, Xavier Maître, Marie-France Bellin
Imaging plays an important role in the diagnosis and therapeutic response evaluation of muscular diseases. However, one important limitation is its incapacity to assess the in vivo biomechanical properties of the muscles. The emerging shear wave sonoelastography technique offers a quantifiable spatial representation of the viscoelastic characteristics of skeletal muscle. Elastography is a non-invasive tool used to analyze the physiologic and biomechanical properties of muscles in healthy and pathologic conditions...
December 9, 2017: Skeletal Radiology
Maha Hasab-Allah, Rabab Mamoun Salama, Mohamed Saeed Marie, Ahmed Alsaeed Mohammed Mandur, Heba Omar
No abstract text is available yet for this article.
December 8, 2017: Expert Review of Gastroenterology & Hepatology
J Squire, M W Kunz, E Quataert, A A Schekochihin
This corrects the article DOI: 10.1103/PhysRevLett.119.155101.
October 27, 2017: Physical Review Letters
A Manacorda, A Puglisi
We derive the hydrodynamic equations with fluctuating currents for the density, momentum, and energy fields for an active system in the dilute limit. In our model, nonoverdamped self-propelled particles (such as grains or birds) move on a lattice, interacting by means of aligning dissipative forces and excluded volume repulsion. Our macroscopic equations, in a specific case, reproduce a transition line from a disordered phase to a swarming phase and a linear dispersion law accounting for underdamped wave propagation...
November 17, 2017: Physical Review Letters
So Hyun Park, Seung Soo Lee, Ji-Youn Sung, Kiyong Na, Hyoung Jung Kim, So Yeon Kim, Beom Jin Park, Jae Ho Byun
OBJECTIVES: To determine the feasibility of acoustic radiation force impulse (ARFI) elastography in the evaluation of hepatic sinusoidal obstruction syndrome (SOS) in rat models. METHODS: Rat SOS models of various severities were created by monocrotaline gavage (n = 40) or by intraperitoneal injection of 5-fluorouracil, leucovorin and oxaliplatin (FOLFOX) (n = 16). Liver shear-wave velocity (SWV) was measured using ARFI elastography. Liver samples were analysed for the SOS score, steatosis, lobular inflammation and fibrosis...
December 7, 2017: European Radiology
Zhenyan Guo, Qun Yuan, Jia Wang, Chao Zuo, Lei Chen
Due to its advantages of nonintrusiveness, wide measurement range, and insensitivity to variation, Moiré deflectometry is a powerful tool for quantitative measurement of a flow field's physical parameters such as density and temperature. Moiré volume computed tomography (MVCT), combining the moiré deflectometry and volume optical computed tomography (VOCT), can realize real three-dimensional parameters reconstruction, in which the radial derivatives extraction of the projected phase is of great importance...
November 20, 2017: Applied Optics
Carla Müller Ramos-Tonello, Bruno Freitas Trevizo, Raphaela Farias Rodrigues, Ana Paula Rodrigues Magalhães, Adilson Yoshio Furuse, Paulo Noronha Lisboa-Filho, Americo Sheitiro Tabata, Ana Flávia Sanches Borges
OBJECTIVES.: Sandblasting is a common method to try to improve the Y-TZP/veneer bond strength of dental prostheses, however, it may put stress on zirconia surfaces and could accelerate the t→m phase transformation. Y-TZP sandblasting before sintering could be an alternative to improve surface roughness and bonding strength of veneering ceramic. The aim of this study was to analyze the effect of Y-TZP pre-sintering sandblasting on surface roughness, phase transformation, and the Y-TZP/veneer shear bond strength...
November 2017: Journal of Applied Oral Science: Revista FOB
Rodrigo Menezes Jales, Maira Teixeira Dória, Kátia Piton Serra, Mila Meneguelli Miranda, Carlos Alberto Menossi, Klaus Schumacher, Luis Otávio Sarian
OBJECTIVES: To prospectively investigate the diagnostic accuracy and clinical consequences of power Doppler morphologic criteria and shear wave elastography (SWE) as complementary imaging methods for evaluation of suspected local breast cancer recurrence in the ipsilateral breast or chest wall. METHODS: Thirty-two breast masses with a suspicion of local breast cancer recurrence on B-mode ultrasonography underwent complementary power Doppler and SWE evaluations. Power Doppler morphologic criteria were classified as avascular, hypovascular, or hypervascular...
December 4, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Chandra Bortolotto, Elena Turpini, Paolo Felisaz, Daniele Fresilli, Ilaria Fiorina, Maria Vittoria Raciti, Elena Belloni, Olivia Bottinelli, Vito Cantisani, Fabrizio Calliada
Purpose: Peripheral nerves frequently travel close to the bone surface and are, therefore, prone to elastosonographic "bone-proximity" hardening artifacts. The impact of these artifacts on quantitative measurements of median nerve stiffness performed by shear wave elastosonography has not been explored. Our aim was to assess normal median nerve stiffness values at various locations. Materials and methods: Thirty-six healthy volunteers (24 women and 12 men) aged between 25 and 40 years were evaluated...
December 2017: Journal of Ultrasound
Carla Serra, Fernando Rizzello, Chiara Pratico', Cristina Felicani, Erica Fiorini, Ramona Brugnera, Elena Mazzotta, Francesca Giunchi, Michelangelo Fiorentino, Antonietta D'Errico, Antonio Maria Morselli-Labate, Marianna Mastroroberto, Massimo Campieri, Gilberto Poggioli, Paolo Gionchetti
Purpose: The distinction between active inflammation and fibrosis of the bowel wall is essential for therapeutic decisions in stricturing Crohn's disease. We aimed to assess whether real-time elastography (RTE) with strain ratio measurement could be useful in differentiating fibrotic from inflamed bowel strictures and to evaluate the possible relationship between US techniques and the histology of the stenotic bowel wall. Materials and methods: Bowel ultrasonography (including RTE, color-Doppler and CEUS examination) was prospectively evaluated in 26 patients with symptomatic stricturing Crohn's disease, before surgery...
December 2017: Journal of Ultrasound
Ruo-Kun Li, Xin-Pin Ren, Fu-Hua Yan, Jin-Wei Qiang, Hui-Min Lin, Tao Wang, Hong-Fei Zhao, Wei-Bo Chen
PURPOSE: To compare the results of T1ρ MR imaging and 2D real-time shear-wave elastography (SWE) for liver fibrosis detection and staging. METHODS: Twenty-nine rabbit models of CCl4-induced liver fibrosis were established and six untreated rabbits served as controls. T1ρ MR imaging and 2D real-time SWE examination were performed at 2, 4, 6, 8, 10, and 12 weeks. T1ρ values and liver stiffness (LS) values were measured. Fibrosis was staged according to the METAVIR scoring system...
December 2, 2017: Abdominal Radiology
Abdulrahman M Alfuraih, Philip O'Connor, Ai Lyn Tan, Elizabeth Hensor, Paul Emery, Richard J Wakefield
AIMS: The reliability and agreement between shear wave elastography (SWE) systems using different acquisition methods in muscles is not yet established. The objectives were to determine the reliability of a new SWE system on normal resting muscles using different acquisition methods and to compare its performance to an established state-of-the-art system.Material and methods: Small, medium and large ROI sizes in addition to longitudinal, oblique and transverse orientations over five different locations within the rectus femoris muscle were tested using the new system...
November 29, 2017: Medical Ultrasonography
Ahmet Veysel Polat, Mesut Ozturk, Behic Akyuz, Cetin Celenk, Mehmet Kefeli, Cafer Polat
AIMS: The aim of this study was to prospectively assess the feasibility of the Virtual Touch tissue imaging quantification (VTIQ) method of shear wave elastography (SWE) for the discrimination of parathyroid lesions and to compare the lesions' stiffness with that of cervical lymph nodes. MATERIALS AND METHODS: SWE using VTIQ was performed on 66 patients with 87 histopathologically proven parathyroid lesions (54 parathyroid adenomas and 33 parathyroid hyperplasia) and 29 patients with 31 inflammatory cervical lymph nodes...
November 29, 2017: Medical Ultrasonography
Hyun Joo Shin, Yong Seung Lee, Haesung Yoon, Myung-Joon Kim, Sang Won Han, Ha Yan Kim, Jinae Lee, Mi-Jung Lee
AIMS: To evaluate the differences and changes of testicular volume and elasticity in normal (NL) testes and undescended testes (UDTs) of children using shear wave elastography (SWE). MATERIALS AND METHODS: Testicular ultrasound images from children younger than 60 months old were retrospectively reviewed. Testicular volumes and elasticities were compared between the UDT group and NL group. In patients with unilateral UDT (uUDT), we also compared the values between uUDT and contralateral grossly normal (CGN) testis groups...
November 29, 2017: Medical Ultrasonography
Lilian Grass, Nora Szekely, Abdulsattar Alrajab, Thi Thanh Tam Bui-Ta, Georg Friedrich Hoffmann, Elke Wühl, Jens-Peter Schenk
AIMS: To evaluate the applicability of point shear wave elastography (pSWE) for measuring renal parenchymal stiffness in healthy children and adolescents and to establish norm values for shear wave speed (SWS) using two ARFI methods and ultrasound probes. MATERIAL AND METHODS: We prospectively investigated 264 children (43.9% males). pSWE (Virtual TouchTM Quantification and Virtual TouchTM Imaging Quantification (VTQ and VTIQ; Siemens, Germany)) was performed in the renal cortex of 528 healthy kidneys using a 1-6 MHz convex and a 4-9 MHz linear ultrasound probe in ventrolateral and dorsal examinations...
November 29, 2017: Medical Ultrasonography
Gregor Seliger, Katharina Chaoui, Christian Kunze, Yasmina Dridi, Klaus-Vitold Jenderka, Andreas Wienke, Michael Tchirikov
AIMS: The elastic properties of circumscribed tissues (e.g., tendons, lymph nodes, prostates, brain tumors) are of considerable clinical interest. The purpose of this study was thus to compare the Intra-/Inter-observer variation and accuracy in vitro of point shear wave elastography (pSWE) with that of 2D-SWE and to assess 2D-SWE's precision with variable ROI (vROI) incircumscribed objects. MATERIAL AND METHODS: Round targets (Elasticity QA Phantom Model 049) were examined for varying degrees of stiffness (8, 14, 45, and 80 kPa) and diameters (20/10 mm)...
November 29, 2017: Medical Ultrasonography
Cedo M Bagi, Kristin Edwards, Edwin Berryman
Metabolic syndrome and osteoporosis share similar risk factors. Also, patients with diabetes have a higher risk of osteoporosis and fracture. Liver manifestations, such as non-alcoholic steatohepatitis (NASH), of metabolic syndrome are further aggravated in diabetics and often lead to liver failure. Our objective was to create a rat model of human metabolic syndrome and determine the long-term impact of early-onset T1D on bone structure and strength in obese growing rats. Male rats were given either standard chow and RO water (Controls) or a high-fat, high-cholesterol diet and sugar water containing 55% fructose and 45% glucose (HFD)...
December 1, 2017: Calcified Tissue International
Stanislav Glubokovskikh, Boris Gurevich
Explicit expressions for bounds on the effective bulk and shear moduli of mixture of an elastic solid and Newtonian fluid are derived. Since in frequency domain the shear modulus of the Newtonian fluid is complex valued, the effective mixture moduli are, in general, also complex valued and, hence, the bounds are curves in the complex plane. From the general expressions for bounds of effective moduli of viscoelastic mixtures, it is shown that effective bulk and shear moduli of such mixtures must lie between the real axis and a semicircle in the upper half-plane connecting formal lower and upper Hashin-Shtrikman bounds of the mixture of the solid and inviscid fluid of the same compressibility as the Newtonian fluid...
November 2017: Journal of the Acoustical Society of America
Nicolás Benech, Javier Brum, Gustavo Grinspan, Sofía Aguiar, Carlos A Negreira
In dynamic elastography, the goal is to estimate the Young's modulus from audio-frequency wave propagation in soft-tissues. Within this frequency range, the shear wavelength is centimeter-sized while the compressional wavelength is meter-sized. Thus, the experimental data are usually collected in the near-field of the source. Near-field effects have been widely studied for bulk wave propagation. However, the near- and transient-fields of surface and guided waves have received less attention. In this work, the transient surface displacement field in soft-solid elastic plates in vacuum is analyzed...
November 2017: Journal of the Acoustical Society of America
J H Lopes, J P Leão-Neto, G T Silva
Analytical expressions of the absorption, scattering, and elastic radiation force efficiency factors are derived for the longitudinal plane wave scattering by a small viscoelastic particle in a lossless solid matrix. The particle is assumed to be much smaller than the incident wavelength, i.e., the so-called long-wavelength (Rayleigh) approximation. The efficiencies are dimensionless quantities that represent the absorbed and scattering powers and the elastic radiation force on the particle. In the quadrupole approximation, they are expressed in terms of contrast functions (bulk and shear moduli, and density) between the particle and solid matrix...
November 2017: Journal of the Acoustical Society of America
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