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low frequency ultrasound

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https://www.readbyqxmd.com/read/28534769/a-systematic-investigation-of-lateral-estimation-using-various-interpolation-approaches-in-conventional-ultrasound-imaging
#1
Zhi Liu, Chengwu Huang, Jianwen Luo
Accurate lateral displacement and strain estimat- ion is critical for some applications of elasticity imaging. Typically, motion estimation in the lateral direction is challenging because of low sampling frequency and lack of phase information in conventional ultrasound imaging. Several approaches have been proposed to improve the performance of lateral estimation, such as lateral interpolation on the RF signals (Interp_RF), lateral interpolation on the cross-correlation function (Interp_CCF) and lateral interpolation on both the RF signals and cross-correlation function (Interp_Both)...
May 17, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28524261/application-of-low-frequency-sonophoresis-and-reduction-of-antibiotics-in-the-aquatic-systems
#2
C Cobo Labarca, J Radinger, V Schöning, R Ariav, R Jung, K D Thompson, W Kloas, K Knopf
A major concern in aquaculture is the use of chemical therapeutics, such as antibiotics, because of their impact on the environment as well as on the fish product. As a potential tool for reducing antibiotic use, we tested the application of low-frequency ultrasound as a method for enhancing antibiotic uptake. Rainbow trout juveniles (Oncorhynchus mykiss) were exposed to two different concentrations of oxytetracycline (OTC), flumequine (FLU) and florfenicol (FLO), administered by bath after the application of ultrasound...
May 19, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28514379/-closed-management-of-pancreatic-necrosis-complicated-by-diffuse-peritonitis
#3
E K Salakhov, A P Vlasov
AIM: To assess an efficiency of closed management of pancreatic necrosis complicated by widespread peritonitis by using of elective laparoscopic sanations with ultrasonic processing of an abdominal cavity and retroperitoneal space. MATERIAL AND METHODS: Treatment of 111 patients with pancreatic necrosis complicated by diffuse peritonitis was analyzed. Closed management was used in 41 patients (main group). Among them there were 12 patients who underwent laparoscopic sanation with ultrasonic cavitation of abdominal cavity, laparoscopic drainage of omental bag, US-assisted puncture drainage of retroperitoneal space and 29 patients after laparotomy followed by laparoscopic lavage and low-frequency ultrasound through retroperitoneal drains which were deployed during lumbotomy or under US control...
2017: Khirurgiia
https://www.readbyqxmd.com/read/28509710/ultrasound-guided-pericardiocentesis-a-novel-parasternal-approach
#4
Adi Osman, Tan Wan Chuan, Jamalludin Ab Rahman, Gabriele Via, Guido Tavazzi
OBJECTIVE: The aim of this study was to evaluate a novel pericardiocentesis technique using an in-plane parasternal medial-to-lateral approach with the use of a high-frequency probe in patients with cardiac tamponade. BACKGROUND: Echocardiography is pivotal in the diagnosis of pericardial effusion and tamponade physiology. Ultrasound guidance for pericardiocentesis is currently considered the standard of care. Several approaches have been described recently, which differ mainly on the site of puncture (subxiphoid, apical, or parasternal)...
May 15, 2017: European Journal of Emergency Medicine: Official Journal of the European Society for Emergency Medicine
https://www.readbyqxmd.com/read/28504325/therapeutic-ultrasound-for-venous-leg-ulcers
#5
REVIEW
Nicky Cullum, Zhenmi Liu
BACKGROUND: Venous leg ulcers are a type of chronic, recurring, complex wound that is more common in people aged over 65 years. Venous ulcers pose a significant burden to patients and healthcare systems. While compression therapy (such as bandages or stockings) is an effective first-line treatment, ultrasound may have a role to play in healing venous ulcers. OBJECTIVES: To determine whether venous leg ulcers treated with ultrasound heal more quickly than those not treated with ultrasound...
May 15, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28504278/high-frequency-linear-rheology-of-hydrogels-probed-by-ultrasound-driven-microbubble-dynamics
#6
Akaki Jamburidze, Marco De Corato, Axel Huerre, Angelo Pommella, Valeria Garbin
Ultrasound-driven microbubble dynamics are central to biomedical applications, from diagnostic imaging to drug delivery and therapy. In therapeutic applications, the bubbles are typically embedded in tissue, and their dynamics are strongly affected by the viscoelastic properties of the soft solid medium. While the behaviour of bubbles in Newtonian fluids is well characterised, a fundamental understanding of the effect on ultrasound-driven bubble dynamics of a soft viscoelastic medium is still being developed...
May 15, 2017: Soft Matter
https://www.readbyqxmd.com/read/28501684/ultrasonic-hyperactivation-of-cellulase-immobilized-on-magnetic-nanoparticles
#7
Mayur Ramrao Ladole, Jayesh Sevantilal Mevada, Aniruddha Bhalchandra Pandit
In the present work, effect of low power, low frequency ultrasound on cellulase immobilized magnetic nanoparticles (cellulase@MNPs) was studied. To gain maximum activity recovery in cellulase@MNPs various parameters viz. ratio of MNPs:cellulase, concentration of glutaraldehyde and cross-linking time were optimized. The influence of ultrasonic power on cellulase@MNPs was studied. Under ultrasonic conditions at 24kHz, 6W power, and 6min of incubation time there was almost 3.6 fold increased in the catalytic activity of immobilized cellulase over the control...
April 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28499816/tumor-ablation-using-low-intensity-ultrasound-and-sound-excitable-drug
#8
Ching-Hsuan Tung, Myung Shin Han, Young Kim, Jianjun Qi, Brian E O'Neill
The cell membrane is a semi-fluid container that defines the boundary of cells, and provides an enclosed environment for vital biological processes. A sound excitable drug (SED) that is non-cytotoxic to cells is developed to disrupt the plasma membrane under gentle ultrasound insonation, 1MHz, 1W/cm(2). The frequency and power density of insonation are within the physical therapy and medical imaging windows; thus the applied ultrasound is safe and not harmful to tissues. The insertion of SEDs into the plasma membrane is not toxic to cells; however, the intruding SEDs weaken the membrane's integrity...
May 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28494102/non-invasive-carotid-artery-elastography-using-multi-element-synthetic-aperture-imaging-phantom-and-in-vivo-evaluation
#9
Rohit Nayak, Giovanni Schifitto, Marvin M Doyley
PURPOSE: Vascular elastography can visualize the strain distribution in the carotid artery, which could be useful in assessing the propensity of advanced plaques to rupture. In our previous studies, we demonstrated that sparse synthetic aperture (SA) imaging can produce high quality vascular strain elastograms. However, the low output power of SA imaging may hamper its clinical utility. In this study, we hypothesize that multi-element defocused emissions can overcome this limitation and improve the quality of the vascular strain elastograms...
May 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28478825/do-flexible-inter-injection-intervals-improve-the-effects-of-botulinum-toxin-a-treatment-in-reducing-impairment-and-disability-in-patients-with-spasticity
#10
Carlo Trompetto, Lucio Marinelli, Laura Mori, Luca Puce, Elisa Pelosin, Carlo Serrati, Francesco Fattapposta, Steno Rinalduzzi, Giovanni Abbruzzese, Antonio Currà
In patients treated with botulinum toxin-A (BoNT-A), toxin-directed antibody formation was related to the dosage and frequency of injections, leading to the empirical adoption of minimum time intervals between injections of 3months or longer. However, recent data suggest that low immunogenicity of current BoNT-A preparations could allow more frequent injections. Our hypothesis is that a short time interval between injections may be safe and effective in reducing upper limb spasticity and related disability...
May 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28472463/genome-wide-association-study-meta-analysis-for-quantitative-ultrasound-parameters-of-bone-identifies-five-novel-loci-for-broadband-ultrasound-attenuation
#11
Benjamin H Mullin, Jing Hua Zhao, Suzanne J Brown, John R B Perry, Jian'an Luan, Hou-Feng Zheng, Claudia Langenberg, Frank Dudbridge, Robert Scott, Nick J Wareham, Tim D Spector, J Brent Richards, John P Walsh, Scott G Wilson
Osteoporosis is a common and debilitating bone disease that is characterised by low bone mineral density, typically assessed using dual-energy X-ray absorptiometry. Quantitative ultrasound (QUS), commonly utilising the two parameters velocity of sound (VOS) and broadband ultrasound attenuation (BUA), is an alternative technology used to assess bone properties at peripheral skeletal sites. The genetic influence on the bone qualities assessed by QUS remains an under-studied area. We performed a comprehensive GWAS including low-frequency variants (MAF ≥0...
May 4, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28464969/utilization-criteria-for-prehospital-ultrasound-in-a-canadian-critical-care-helicopter-emergency-medical-service-determining-who-might-benefit
#12
Domhnall O'Dochartaigh, Matthew Douma, Chris Alexiu, Shell Ryan, Mark MacKenzie
Introduction Prehospital ultrasound (PHUS) assessments by physicians and non-physicians are performed on medical and trauma patients with increasing frequency. Prehospital ultrasound has been shown to be of benefit by supporting interventions. Problem Which patients may benefit from PHUS has not been clearly identified. METHODS: A multi-variable logistic regression analysis was performed on a previously created retrospective dataset of five years of physician- and non-physician-performed ultrasound scans in a Canadian critical care Helicopter Emergency Medical Service (HEMS)...
May 3, 2017: Prehospital and Disaster Medicine
https://www.readbyqxmd.com/read/28452456/polylactic-acid-sealed-polyelectrolyte-multilayer-microchambers-for-entrapment-of-salts-and-small-hydrophilic-molecules-precipitates
#13
Meiyu Gai, Johannes Frueh, Valeriya L Kudryavtseva, Alexey M Yashchenok, Gleb B Sukhorukov
Efficient depot systems for entrapment and storage of small water-soluble molecules are of high demand for wide variety of applications ranging from implant based drug delivery in medicine and catalysis in chemical processes to anticorrosive systems in industry where surface-mediated active component delivery is required on a time and site specific manner. This work reports the fabrication of individually sealed hollow-structured polyelectrolyte multilayer (PEM) microchamber arrays based on layer-by-layer self-assembly as scaffolds and microcontact printing...
May 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28450883/use-of-ultrasonication-to-increase-germination-rates-of-arabidopsis-seeds
#14
Ignacio López-Ribera, Carlos M Vicient
BACKGROUND: Arabidopsis thaliana is widely used as model organism in plant biology. Although not of agronomic significance, it offers important advantages for basic research in genetics and molecular biology including the availability of a large number of mutants and genetically modified lines. However, Arabidopsis seed longevity is limited and seeds stored for more than 10 years usually show a very low capacity for germination. RESULTS: The influence of ultrasonic stimulation was investigated on the germination of A...
2017: Plant Methods
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
#15
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
#16
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
#17
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
#18
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/28427670/estimation-of-the-distribution-of-low-intensity-ultrasound-mechanical-index-as-a-parameter-affecting-the-proliferation-of-spermatogonia-stem-cells-in-vitro
#19
Zeinab Hormozi Moghaddam, Manijhe Mokhtari-Dizaji, Mansoureh Movahedin, Mohammad Ehsan Ravari
Considering the use of physical and mechanical stimulation, such as low-intensity ultrasound for proliferation and differentiation of stem cells, it is essential to understand the physical and acoustical mechanisms of acoustic waves in vitro. Mechanical index is used for quantifying acoustic cavitation and the relationship between acoustic pressure and the frequency. In this study, modeling of the mechanical index was applied to provide treatment protocol and to understand the effective physical processes on reproducibility of stem cells...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427664/ultrasonic-irradiation-of-low-intensity-with-a-mode-of-sweeping-frequency-enhances-the-membrane-permeability-and-cell-growth-rate-of-candida-tropicalis
#20
Guoping Huang, Yingxiu Tang, Ling Sun, Huan Xing, Haile Ma, Ronghai He
Here we report the enhancement of both cellular permeability and cell growth rate of Candida tropicalis after treatment with the ultrasonic irradiation of low intensity using a mode of sweeping frequency (UILS) generated by a self-developed ultrasonic device in our lab. After the ultrasonic treatment, remarkable biomass enhancement of the yeast was observed; the hyphae became significantly longer; the seeped cellular protein and nucleic acid from the yeast increased and the cellular Ca(2+) content became lower...
July 2017: Ultrasonics Sonochemistry
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