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high frequency ultrasound

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https://www.readbyqxmd.com/read/28440041/ultrasound-assisted-versus-conventional-catheter-directed-thrombolysis-for-acute-ilio-femoral-deep-vein-thrombosis-one-year-follow-up-data-of-a-randomized-controlled-trial
#1
Rolf P Engelberger, Anna Stuck, David Spirk, Torsten Willenberg, Axel Haine, Daniel Périard, Iris Baumgartner, Nils Kucher
BACKGROUND: In patients with acute ilio-femoral deep vein thrombosis (IFDVT), catheter-directed thrombolysis (CDT) aims to prevent the post-thrombotic syndrome (PTS). Adding intravascular high-frequency, low-power ultrasound energy to CDT does not seem to improve the immediate thrombolysis results but its impact on clinical outcomes at 12 months is not known. PATIENTS/METHODS: In this randomized-controlled trial, 48 patients (mean age 50±21 years, 52% women) with acute IFDVT were randomized to conventional CDT (n=24) or ultrasound-assisted CDT (USAT; n=24)...
April 25, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28436918/an-integrated-and-highly-sensitive-ultrafast-acoustoelectric-imaging-system-for-biomedical-applications
#2
Beatrice Berthon, Pierre-Marc Dansette, Mickael Tanter, Mathieu Pernot, Jean Provost
PURPOSE: Direct imaging of cardiac electrical activation is crucial to better understand and diagnose diseases linked to arrhythmias. This work presents an Ultrafast Acoustoelectric Imaging (UAI) system for direct and non-invasive ultrafast mapping of propagating current densities. MATERIALS AND METHODS: Acoustoelectric imaging is based on the acoustoelectric effect, the modulation of the medium's electrical impedance by a propagating ultrasonic wave. UAI triggers this effect with plane wave emissions to image current densities...
April 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28434880/ultrasound-assisted-extraction-of-rare-earth-elements-from-carbonatite-rocks
#3
Lisarb O Diehl, Thais L Gatiboni, Paola A Mello, Edson I Muller, Fabio A Duarte, Erico M M Flores
In view of the increasing demand for rare-earth elements (REE) in many areas of high technology, alternative methods for the extraction of these elements have been developed. In this work, a process based on the use of ultrasound for the extraction of REE from carbonatite (an igneous rock) is proposed to avoid the use of concentrated reagents, high temperature and excessive extraction time. In this pioneer work for REE extraction from carbonatite rocks in a preliminary investigation, ultrasonic baths, cup horn systems or ultrasound probes operating at different frequencies and power were evaluated...
April 12, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28433437/optimal-ultrasound-exposure-conditions-for-maximizing-c2c12-muscle-cell-proliferation-and-differentiation
#4
Alice Rita Salgarella, Andrea Cafarelli, Leonardo Ricotti, Lorenzo Capineri, Paolo Dario, Arianna Menciassi
Described here is an in vitro systematic investigation of the effects on C2C12 myoblasts of exposure to finely controlled and repeatable low-intensity pulsed ultrasound of different frequencies (500 kHz, 1 MHz, 3 MHz and 5 MHz) and different intensities (250, 500 and 1000 mW/cm(2)). An in-house stimulation system and an ultrasound-transparent cell culture well minimized reflections and attenuations, allowing precise control of ultrasound delivery. Results indicated that a 3 MHz stimulation at 1 W/cm(2) intensity maximized cell proliferation in comparison with the other exposure conditions and untreated controls...
April 19, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28427667/membrane-cleaning-with-ultrasonically-driven-bubbles
#5
Fabian Reuter, Sonja Lauterborn, Robert Mettin, Werner Lauterborn
A laboratory filtration plant for drinking water treatment is constructed to study the conditions for purely mechanical in situ cleaning of fouled polymeric membranes by the application of ultrasound. The filtration is done by suction of water with defined constant contamination through a membrane module, a stack of five pairs of flat-sheet ultrafiltration membranes. The short cleaning cycle to remove the cake layer from the membranes includes backwashing, the application of ultrasound and air flushing. A special geometry for sound irradiation of the membranes parallel to their surfaces is chosen...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427629/development-of-a-novel-folate-modified-nanobubbles-with-improved-targeting-ability-to-tumor-cells
#6
Sujuan Duan, Lu Guo, Dandan Shi, Mengmeng Shang, Dong Meng, Jie Li
Conjugation of folate (FOL) to nanobubbles could enhance the selective targeting to tumors expressing high levels of folate receptor (FR). To further improve the selective targeting ability of FOL-modified nanobubbles, a novel FOL-targeted nanobubble ((FOL)2-NB) with increasing FOL content (accomplished by linking two FOL molecules per DSPE-PEG2000 chain) was synthesized, through the methods of mechanical shaking and low-speed centrifugation based on lipid-stabilized perfluoropropane. The bubble size and distribution range were measured by dynamic light scattering (DLS)...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28420906/comparison-of-ultrasound-and-ultrasound-plus-nerve-stimulator-guidance-axillary-plexus-block
#7
Gokhan Demirelli, Semih Baskan, Isil Karabeyoglu, Ismail Aytac, Dilsen Hatice Ornek, Alper Erdogmus, Mustafa Baydar
OBJECTIVE: To evaluate the characteristics of axillary plexus blockade applied using ultrasound only and using ultrasound together with nerve stimulator in patients undergoing planned forearm, wrist or hand surgery. METHODS: This randomised, prospective, double-blinded, single-centre study was conducted at Ankara Numune Training and Research Hospital, Ankara, Turkey, from November 2014 to August 2015, and comprised patients undergoing forearm, wrist or hand surgery...
April 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28420236/human-hepatocarcinoma-cell-targeting-by-glypican-3-ligand-peptide-functionalized-silica-nanoparticles-implications-for-ultrasound-molecular-imaging
#8
Marco Di Paola, Alessandra Quarta, Francesco Conversano, Enzo Antonio Sbenaglia, Simona Bettini, Ludovico Valli, Giuseppe Gigli, Sergio Casciaro
Silica nanoparticles (SiNPs) are widely studied nanomaterials for their potential employment in advanced biomedical applications, such as selective molecular imaging and targeted drug delivery. SiNPs are generally low cost and highly biocompatible, can be easily functionalized with a wide variety of functional ligands, and have been demonstrated to be effective in enhancing ultrasound contrast at clinical diagnostic frequencies. Therefore, SiNPs might be used as contrast agents in echographic imaging. In this work, we have developed a SiNPs-based system for the in vitro molecular imaging of hepatocellular carcinoma cells that express high levels of glypican-3 protein (GPC-3) on their surface...
April 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28416391/ultrasound-guided-out-of-plane-versus-in-plane-transpectoral-left-axillary-vein-cannulation
#9
Madan Mohan Maddali, Nishant Ram Arora, Nilay Chatterjee
OBJECTIVE: The primary objective was to compare the frequency of first-attempt successful axillary vein cannulation by the Seldinger technique using out-of-plane ultrasound guidance versus in-plane imaging. Between the two ultrasound imaging planes, this study also compared the number of attempts that were necessary for the cannulation of the left axillary vein along with the number of needle redirections that had to be done for final cannulation of the vein. Incidence of complications and the number of times the procedure was abandoned also were compared between the two imaging planes...
February 15, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28406160/morphological-detection-and-functional-assessment-of-regenerated-nerve-after-neural-prosthesis-with-a-pgla-nerve-conduit
#10
Dong Gao, Jun-Jian Jiang, Shi-Hui Gu, Jiu-Zhou Lu, Lei Xu
This study aimed to observe the morphological characteristics of a PGLA [poly(glycolide-co-L-lactide)] nerve conduit and regenerated nerve bundle in the human body using high-frequency ultrasound and examine functional recovery of the regenerated nerve using functional magnetic resonance imaging (fMRI) after neural prosthesis with a PGLA nerve conduit. Thirty-nine patients underwent high-frequency ultrasound, and one patient with superficial radial nerve injury (27-mm defect) underwent fMRI at one, three, and six postoperative months...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28399067/role-of-the-corneal-epithelium-measurements-in-keratorefractive-surgery
#11
Marcella Q Salomão, Ana Luisa Hofling-Lima, Bernardo T Lopes, Ana Laura C Canedo, Daniel G Dawson, Rui Carneiro-Freitas, Renato Ambrósio
PURPOSE OF REVIEW: Refractive surgery has stimulated considerable progress in corneal and anterior segment imaging, and optical characterization of the eye. From front surface corneal topography, we evolved to three-dimensional corneal tomography with limbus to limbus characterization of the front and back corneal surfaces and pachymetric mapping. Corneal anatomical evaluation has further evolved to layered or segmental tomography with the ability to characterize corneal epithelial thickness profile and the elevation of stromal front surface...
April 8, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28395890/frequency-of-nonalcoholic-fatty-liver-disease-and-subclinical-atherosclerosis-among-young-mexican-americans
#12
Clarence Gill, Kristina P Vatcheva, Jen-Jung Pan, Beverly Smulevitz, David D McPherson, Michael Fallon, Joseph B McCormick, Susan P Fisher-Hoch, Susan T Laing
Nonalcoholic fatty liver disease (NAFLD) is considered as the hepatic manifestation of the metabolic syndrome, whose criteria are risk factors for atherosclerotic cardiovascular disease. We aimed to evaluate the prevalence of NAFLD, its association with subclinical atherosclerosis, and factors that may account for this association in Mexican Americans. In a population-based cross-sectional sample drawn from the Cameron County Hispanic Cohort in Texas, carotid intima media thickness (cIMT), an indicator of subclinical atherosclerosis, was measured...
March 16, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28391195/development-of-a-low-complexity-cost-effective-digital-beamformer-architecture-for-high-frequency-ultrasound-imaging
#13
Changhan Yoon, Hyung Ham Kim, K K Shung
This paper presents a low-complexity, cost-effective digital beamformer architecture for a high-frequency ultrasound imaging system. The proposed beamformer uses a look-up-table (LUT) and linear interpolation methods for computing the dynamic receive focusing delays and a post-filtering technique to minimize hardware complexity. In the post-filtering technique, channel radio-frequency (RF) data having the same fractional delay (i.e., 16f0 resolution) are aggregated prior to interpolation. Thus, only four polyphase structure filters are required in the developed beamformer...
April 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28386036/silent-brain-infarctions-and-leukoaraiosis-in-patients-with-retinal-ischemia-a-prospective-single-center-observational-study
#14
Amir Golsari, Diana Bittersohl, Bastian Cheng, Pia Griem, Christoph Beck, Andrea Hassenstein, Max Nedelmann, Tim Magnus, Jens Fiehler, Christian Gerloff, Götz Thomalla
BACKGROUND AND PURPOSE: We aimed to determine the incidence of co-occurring cerebral ischemia, extent of cerebral small vessel disease, and vascular risk profile of patients with acute retinal ischemia. METHODS: RETIS (Frequency of Acute Silent Brain Infarction and Systematic Evaluation of Stroke Risk in Retinal Ischemia) was a single-center, prospective, observational study comprising ophthalmologic examination, brain magnetic resonance imaging, and extensive diagnostic work-up of vascular risk factors and stroke cause...
April 6, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28382132/monitoring-of-blood-vessel-density-using-contrast-enhanced-high-frequency-ultrasound-may-facilitate-early-diagnosis-of-lymph-node-metastasis
#15
Takuma Sato, Tomoaki Takemura, Tomoki Ouchi, Shiro Mori, Maya Sakamoto, Yoichi Arai, Tetsuya Kodama
Time-dependent alterations in the ultrasonography characteristics of lymph nodes during early-stage metastasis have not been compared with those of tumor-draining lymph nodes that do not develop tumor; this is partly due to the absence of an appropriate experimental model. In a previous study of lymph nodes with experimental early-stage metastasis, we used contrast-enhanced high-frequency ultrasound to demonstrate that an increase in lymph node blood vessel density preceded any changes in lymph node volume...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28377036/regression-patterns-of-iris-melanoma-after-palladium-103-103-pd-plaque-brachytherapy
#16
Sonal S Chaugule, Paul T Finger
PURPOSE: To evaluate the patterns of regression of iris melanoma after treatment with palladium-103 ((103)Pd) plaque brachytherapy. DESIGN: Retrospective, nonrandomized, interventional case series. PARTICIPANTS: Fifty patients with primary malignant melanoma of the iris. METHODS: Palladium-103 plaque brachytherapy. MAIN OUTCOME MEASURES: Changes in tumor size, pigmentation, and vascularity; incidence of iris neovascularization; and radiation-related complications...
April 1, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28375081/high-frequency-ultrasound-features-and-pathological-characteristics-of-medullary-thyroid-carcinoma
#17
Hua Wang, Mengmeng Liu, Jianqiu Yang, Yimin Song
To study high-frequency ultrasound features and pathological characteristics of medullary thyroid carcinoma (medullary thyroid carcinoma, MTC) with the purpose to improve the diagnostic accuracy of this disease. The clinical data of 20 cases of patients with MTC confirmed by the clinical surgery were retrospectively analyzed. And the high-frequency ultrasound features were analyzed and compared with the pathological characteristics. There were 16 cases with tumor invasion into one side of the thyroid gland; 17 cases with tumor in the middle-upper pole of the thyroid gland...
November 2016: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28372796/a-nonlinear-model-of-cell-interaction-with-an-acoustic-field
#18
A D Miller, A Subramanian, H J Viljoen
A theoretical and experimental nonlinear analysis of cellular response/displacement to ultrasound excitations is presented. Linear cell models can predict the resonant frequency (fR∼5MHz), but only a nonlinear analysis can reveal the amount of mechanical energy that couples into the cell and the bifurcation behavior of the cell when it is excited near resonance. The cell dynamics is described by the nonlinear viscoelastic constitutive behavior of the cytoplasm, nucleus and their respective membranes, in the presence of a fluid with an oscillating pressure field...
March 14, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28372130/the-relation-between-tongue-shape-and-pitch-in-clarinet-playing-using-ultrasound-measurements
#19
Steven M Lulich, Sherman Charles, Benjamin Lulich
Tongue shapes during clarinet performances of chromatic scale, portamento and pitch bending exercises were imaged using an ultrasound machine while audio and video were recorded synchronously. Analysis of the data from four participants revealed that tongue position varies non-monotically with note frequency in the lowest register (up to ≈ 440 Hz) and then descends monotonically as note frequencies rise through the upper registers. The descent of the tongue results in an expansion of the vocal tract's posterior oral cavity, resulting in a vocal tract input impedance maximum tuned to high frequency...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28372123/numerical-study-of-a-confocal-ultrasonic-setup-for-cavitation-creation
#20
Maxime Lafond, Fabrice Prieur, Françoise Chavrier, Jean-Louis Mestas, Cyril Lafon
Acoustic cavitation has found a wide range of applications in the last few decades. For potential applications involving cavitation, the acoustic characteristics of a confocal ultrasonic setup are studied: two high-intensity focused ultrasound transducers are mounted so that their focal points overlap. A mathematical simulator is developed that takes into account nonlinear propagation, absorption, and diffraction. Each one of these physical effects is solved in the frequency domain for successive planes. Comparing the confocal setup with equivalent single transducer setups, it is shown that, with the confocal configuration, nonlinear distortion of the waveform is reduced, resulting in a greater peak rarefactional pressure and a lower peak positive pressure...
March 2017: Journal of the Acoustical Society of America
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