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https://www.readbyqxmd.com/read/27935546/shear-wave-elastography-of-the-testes-in%C3%A2-a%C3%A2-healthy-study-collective-differences-in%C3%A2-standard-values-between-arfi-and%C3%A2-vtiq%C3%A2-techniques
#1
J Marcon, M Trottmann, J Rübenthaler, C G Stief, M F Reiser, D A Clevert
INTRODUCTION: Shear wave elastography (SWE) is a recent technique in the assessment of tissue elasticity. Different elastography techniques have been described over the years.Acoustic Radiation Force Impulse Imaging (ARFI) uses mechanical excitation of tissue to create detectable shear waves, a higher shear wave velocity being associated with an increased tissue stiffness.The Virtual Touch Tissue Imaging Quantification (VTIQ) method uses a mechanical push pulse as well, additionally creating a colour-coded map, in which tissue stiffness can be measured on the stored map on the ultrasound device after measurement...
December 8, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27933438/acoustic-radiation-force-impulse-arfi-elastography-in-the-evaluation-of-renal-parenchymal-stiffness-in-patients-with-ureteropelvic-junction-obstruction
#2
Hatice Arioz Habibi, Rumeysa Yasemin Cicek, Sedat Giray Kandemirli, Emel Ure, Ayse Kalyoncu Ucar, Mine Aslan, Salim Caliskan, Ibrahim Adaletli
PURPOSE: To investigate the role of acoustic radiation force impulse (ARFI) elastography in the detection of renal parenchymal damage in kidneys with and without ureteropelvic junction obstruction (UPJO). METHODS: Twenty-five pediatric patients with a diagnosis of UPJO who underwent surgery and 15 pediatric patients with conservatively managed UPJO were prospectively evaluated with ARFI elastography. Sixteen healthy volunteers constituted the control group. Shear wave velocity (SWV) measurements in the upper, mid, and lower poles of the affected kidney were performed...
December 8, 2016: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/27928468/sonoelastography-in-the-musculoskeletal-system-current-role-and-future-directions
#3
REVIEW
Naomi Winn, Radhesh Lalam, Victor Cassar-Pullicino
Ultrasound is an essential modality within musculoskeletal imaging, with the recent addition of elastography. The elastic properties of tissues are different from the acoustic impedance used to create B mode imaging and the flow properties used within Doppler imaging, hence elastography provides a different form of tissue assessment. The current role of ultrasound elastography in the musculoskeletal system will be reviewed, in particular with reference to muscles, tendons, ligaments, joints and soft tissue tumours...
November 28, 2016: World Journal of Radiology
https://www.readbyqxmd.com/read/27925679/value-of-shear-wave-elastography-versus-contrast-enhanced-sonography-for-differentiating-benign-and-malignant-superficial-lymphadenopathy-unexplained-by-conventional-sonography
#4
Shi Tan, Li-Ying Miao, Li-Gang Cui, Peng-Fei Sun, Lin-Xue Qian
OBJECTIVES: This study aimed to compare the efficacy of shear wave elastography (SWE) and contrast-enhanced sonography in the differential diagnosis of superficial lymphadenopathy with abnormal imaging findings, which could not be otherwise confirmed by conventional sonography. METHODS: Forty-two enlarged superficial lymph nodes in 42 patients who met the screening criteria for this study were evaluated by both contrast-enhanced sonography and SWE. All lymph nodes underwent both methods using biopsy pathologic findings as a reference standard...
November 30, 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27925644/evaluation-of-renal-parenchyma-elasticity-with-acoustic-radiation-force-impulse-quantification-in-nutcracker-syndrome-and-comparisons-with-grayscale-doppler-sonography-and-laboratory-findings
#5
Tumay Bekci, Meltem Ceyhan Bilgici, Gurkan Genc, Demet Tekcan, Ahmet Veysel Polat, Leman Tomak
OBJECTIVES: We sought to evaluate renal parenchymal elasticity with Virtual Touch quantification of acoustic radiation force impulse imaging in nutcracker syndrome and to compare shear-wave velocity (SWV) values with grayscale Doppler sonography and laboratory findings. METHODS: Thirty-eight healthy volunteers and forty-three nutcracker syndrome patients were enrolled in this prospective study. SWV values for both kidneys in nutcracker syndrome patients and healthy volunteers were evaluated...
November 30, 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27919522/quantitative-assessment-of-healthy-skin-elasticity-reliability-and-feasibility-of-shear-wave-elastography
#6
Xi Xiang, Feng Yan, Yujia Yang, Yuanjiao Tang, Liyun Wang, Jia Zeng, Li Qiu
The goal of this study was to investigate the reliability and feasibility of shear wave elastography by assessing the elasticity of the healthy skin of 40 volunteers. Young's moduli for bilateral fingers, forearms, anterior chest (sternum), and anterior abdomen were determined with both transverse and longitudinal sectional measurements. Reliability of measurements was evaluated using intra- and inter-class correlation coefficients with two observers. Our results revealed that the elastic modulus values of the skin between symmetric parts of fingers and forearms did not statistically different...
December 2, 2016: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/27914401/examining-the-effects-of-microstructure-on-geoacoustic-parameters-in-fine-grained-sediments
#7
Megan S Ballard, Kevin M Lee
This paper presents a set of controlled laboratory experiments designed to develop a basis for understanding the relationship between microscopic and macroscopic properties of fine-grained sediments. Two samples of kaolinite platelets were selected for this study, and effects of sediment microstructure on geoacoustic properties are deduced from a comparison of the measured properties. To provide additional interpretation of the acoustic measurements, compressional and shear wave properties are compared to predicted values from sediment-acoustic models...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914388/ultrasonic-method-to-characterize-shear-wave-propagation-in-micellar-fluids
#8
Carolina Amador, Bruno L Otilio, Randall R Kinnick, Matthew W Urban
Viscoelastic micellar fluid characteristics have been measured with mechanically generated shear waves and showed good agreement to shear oscillatory methods. In this paper, shear waves in wormlike micellar fluids using ultrasound were successfully generated and detected. Micellar fluids of different concentrations (100, 200, 300, and 400 mM) were studied with ultrasound-based and conventional rheology methods. The measured micellar fluid complex modulus from oscillatory shear tests between 0.001 and 15.91 Hz was characterized with an extended Maxwell fluid model...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914201/shear-wave-ultrasound-elastographic-evaluation-of-the-rotator-cuff-tendon
#9
Stephanie W Hou, Alexander N Merkle, James S Babb, Robert McCabe, Soterios Gyftopoulos, Ronald S Adler
OBJECTIVES: (1) Assess the association between the B-mode morphologic appearance and elasticity in the rotator cuff tendon using shear wave elastography (SWE). (2) Assess the association between SWE and symptoms. METHODS: Institutional Review Board approval and informed consent were obtained. A retrospective review identified 21 studies in 19 eligible patients for whom SWE was performed during routine sonographic evaluations for shoulder pain. Evaluations were compared with 55 studies from 16 asymptomatic volunteers and 6 patients with asymptomatic contralateral shoulders...
December 3, 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27914180/burned-out-testis-tumors-in-asymptomatic-infertile-men-multiparametric-sonography-and-mri-findings
#10
Laurence Rocher, Ludivine Glas, Marie France Bellin, Sophie Ferlicot, Vincent Izard, Gerard Benoit, Laurence Albiges, Karim Fizazi, Jean-Michel Correas
Multiparametric testicular ultrasound and magnetic resonance imaging (MRI) findings were analyzed in a series of 10 infertile asymptomatic men presenting with pathologically confirmed burned-out testicular tumors. Color/power Doppler ultrasound (CDUS), shear wave elastography (SWE), contrast-enhanced ultrasonography (CEUS), and MRI were performed on 10, 5, 6, and 7 patients, respectively. All lesions appeared as a hypoechoic and hypovascular nodular area at CDUS, SWE, CEUS CDUS, and CEUS (if performed). Shear wave elastography showed a stiffer nodular area compared with the surrounding/contralateral tissues (13 versus 2 kPa); MRI revealed a well-delineated nodular area in hypointense signal on T2, a high apparent diffusion coefficient value, and a lack of enhancement...
December 3, 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27914177/virtual-touch-tissue-imaging-and-quantification-in-the-evaluation-of-thyroid-nodules
#11
Hang Zhou, Xian-Li Zhou, Hui-Xiong Xu, Dan-Dan Li, Bo-Ji Liu, Yi-Feng Zhang, Jun-Mei Xu, Xiao-Wan Bo, Xiao-Long Li, Le-Hang Guo, Shen Qu
OBJECTIVES: To investigate the diagnostic performance of a 2-dimensional shear wave elastographic technique (Virtual Touch tissue imaging and quantification [VTIQ]; Siemens Medical Solutions, Mountain View, CA) for predicting thyroid malignancy. METHODS: A total of 302 thyroid nodules underwent conventional sonography and VTIQ before fine-needle aspiration examination or surgery. Compared with histopathologic or cytologic results in combination with follow-up, the diagnostic performance of various shear wave speed (SWS) indices (minimum [SWSmin ], maximum [SWSmax ], and mean [SWSmean ]) on VTIQ as well as conventional sonographic features for predicting thyroid malignancy was evaluated in all of the nodules...
December 3, 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27913924/shear-wave-elastography-reveals-different-degrees-of-passive-and-active-stiffness-of-the-neck-extensor-muscles
#12
Angela V Dieterich, Ricardo J Andrade, Guillaume Le Sant, Deborah Falla, Frank Petzke, François Hug, Antoine Nordez
PURPOSE: The neck extensor muscles contribute to spinal support and posture while performing head and neck motion. Muscle stiffness relates to passive elasticity (support) and active tensioning (posture and movement) of muscle. It was hypothesized that support and motion requirements are reflected in the distribution of stiffness between superficial and deep neck extensor muscles. METHODS: In ten healthy participants, shear modulus (stiffness) of five neck extensor muscles was determined in prone at rest and during isometric head lift at three intensities using shear wave elastography...
December 2, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27913343/a-frequency-shift-method-to-measure-shear-wave-attenuation-in-soft-tissues
#13
Simon Bernard, Siavash Kazemirad, Guy Cloutier
In vivo quantification of shear wave attenuation in soft tissues may help to better understand human tissue rheology and lead to new diagnostic strategies. Attenuation is difficult to measure in acoustic radiation force elastography because the shear wave amplitude decreases due to a combination of diffraction and viscous attenuation. Diffraction correction requires assuming a cylindrical wavefront and an isotropic propagation medium, which may not be the case in some applications. In this study, the frequency shift method, used in ultrasound imaging and seismology, was adapted for shear wave attenuation measurement in elastography...
December 1, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27913341/quantification-of-shear-wave-scattering-from-far-surface-defects-via-ultrasonic-wavefield-measurements
#14
Alexander J Dawson, Jennifer E Michaels, Joseph W Kummer, Thomas E Michaels
Nondestructive evaluation methods rely on prior knowledge of the expected interaction of ultrasonic waves with defects to inform detection and characterization decisions. Wavefield imaging, which refers to the measurement of signals originating from a spatially fixed source on a two-dimensional rectilinear grid, can be applied to visualize the effect of a subsurface scatterer on surface-measured wave motion. Here, obliquely-incident shear waves are directed at the far surface of a plate containing a through-hole using the well-known angle-beam ultrasonic inspection method...
December 1, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27913340/efficient-3d-reconstruction-in-ultrasound-elastography-via-a-sparse-iteration-based-on-markov-random-fields
#15
Atul Ingle, Tomy Varghese, William Sethares
Percutaneous needle-based liver ablation procedures are becoming increasingly common for treatment of small isolated tumors in hepatocellular carcinoma patients who are not candidates for surgery. Rapid three dimensional visualization of liver ablations has potential clinical value because it can enable interventional radiologists to plan and execute needle-based ablation procedures with real time feedback. Ensuring the right volume of tissue is ablated is desirable to avoid recurrence of tumors from residual untreated cancerous cells...
November 29, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27908029/in-situ-measurements-of-sediment-acoustic-properties-in-currituck-sound-and-comparison-to-models
#16
Kevin M Lee, Megan S Ballard, Andrew R McNeese, Thomas G Muir, Preston S Wilson, R Daniel Costley, Kent K Hathaway
In situ measurements of compressional and shear wave speed and attenuation were collected 30 cm below the water-sediment interface in Currituck Sound, North Carolina at two field locations having distinctly different sediment types: medium-to-fine-grained sand and fine-grained sand with approximately 10% mud content. Shear wave measurements were performed with bimorph transducers to generate and receive horizontally polarized shear waves in the 300 Hz to 1 kHz band, and compressional wave measurements were performed using hydrophones operated in the 5 kHz to 100 kHz band...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27906671/risk-stratification-of-thyroid-nodules-with-bethesda-category-iii-results-on-fine-needle-aspiration-cytology-the-additional-value-of-acoustic-radiation-force-impulse-elastography
#17
Chong-Ke Zhao, Hui-Xiong Xu, Jun-Mei Xu, Cheng-Yu Sun, Wei Chen, Bo-Ji Liu, Xiao-Wan Bo, Dan Wang, Shen Qu
To assess the value of conventional ultrasound, conventional strain elastography (CSE) and acoustic radiation force impulse (ARFI) elastography in differentiating likelihood of malignancy for Bethesda category III thyroid nodules. 103 thyroid nodules with Bethesda category III results on fine-needle aspiration cytology (FNAC) in 103 patients were included and all were pathologically confirmed after surgery. Conventional ultrasound, CSE and ARFI elastography including ARFI imaging and point shear wave speed (SWS) measurement were performed...
November 29, 2016: Oncotarget
https://www.readbyqxmd.com/read/27903789/a-color-doppler-shear-wave-imaging-phase-reconstruction-method-using-four-color-flow-images
#18
Naoki Sunaguchi, Yoshiki Yamakoshi, Takahito Nakajima
This study investigates shear wave phase map reconstruction using a limited number of color flow images (CFIs) acquired with a color Doppler ultrasound imaging instrument. We propose an efficient reconstruction method to considerably reduce the number of CFIs required for reconstruction and compare this method with Fourier analysis-based color Doppler shear wave imaging. The proposed method uses a two-step phase reconstruction process, including an initial phase map derived from four CFIs using an advanced iterative algorithm of optical interferometry...
November 30, 2016: Ultrasonic Imaging
https://www.readbyqxmd.com/read/27902782/correction-shear-wave-elastography-assessments-of-quadriceps-stiffness-changes-prior-to-during-and-after-prolonged-exercise-a-longitudinal-study-during-an-extreme-mountain-ultra-marathon
#19
Pierre Andonian, Magalie Viallon, Caroline Le Goff, Charles de Bourguignon, Charline Tourel, Jérome Morel, Guido Giardini, Laurent Gergelé, Grégoire P Millet, Pierre Croisille
[This corrects the article DOI: 10.1371/journal.pone.0161855.].
2016: PloS One
https://www.readbyqxmd.com/read/27900958/renal-shear-wave-velocity-and-estimated-glomerular-filtration-rate-in-children-with-chronic-kidney-disease
#20
Costanza Bruno, Milena Brugnara, Rocco Micciolo, Mariangela Cecchetto, Michele Zuffante, Alessandra Bucci, Marco Zaffanello
A shear wave velocity (SWV) value obtained by the acoustic radiation force impulse technique depends on tissue elasticity. We investigated the relationship between SWV values and the estimated glomerular filtration rate (eGFR) in children with chronic kidney disease. A total of 29 patients were enrolled in the study. There were 18 primary and 11 secondary cases of vesicoureteral reflux. eGFR was calculated using Schwartz's formulas (2012). Partial eGFR for each kidney was assessed by multiplying the eGFR by the percentage of renal function measured by means of renal (99m)Tc-dimercaptosuccinic acid scintigraphy...
November 2016: Saudi Journal of Kidney Diseases and Transplantation
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