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high frequency ultrasound

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https://www.readbyqxmd.com/read/29155779/a-novel-use-of-three-dimensional-high-frequency-ultrasonography-for-early-pregnancy-characterization-in-the-mouse
#1
Mary C Peavey, Corey L Reynolds, Maria M Szwarc, William E Gibbons, Cecilia T Valdes, Francesco J DeMayo, John P Lydon
High-frequency ultrasonography (HFUS) is a common method to non-invasively monitor the real-time development of the human fetus in utero. The mouse is routinely used as an in vivo model to study embryo implantation and pregnancy progression. Unfortunately, such murine studies require pregnancy interruption to enable follow-up phenotypic analysis. To address this issue, we used three-dimensional (3-D) reconstruction of HFUS imaging data for early detection and characterization of murine embryo implantation sites and their individual developmental progression in utero...
October 24, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29153914/determination-of-orientin-in-trollius-chinensis-using-ultrasound-assisted-extraction-and-high-performance-liquid-chromatography-several-often-overlooked-sample-preparation-parameters-in-an-ultrasonic-bath
#2
Mengxia Wei, Lei Yang
The erratic pressure intensities and cavitation exhibited in an ultrasonic bath pose various during practical application. To achieve the most efficient experimental design, this manuscript aims to discover violently sites that are subject to the effect of slight changes in position on cavitation and ultrasound intensity distributed in the ultrasonic bath. In addition, optimization several often over-looked ultrasound parameters and experimental conditions, are intended to place the reaction vessel properly and operate under suitable experimental conditions to obtain the maximum yield of target analyte...
November 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29150363/development-of-a-3-french-dual-frequency-intravascular-ultrasound-catheter
#3
Chelsea E Munding, Emmanuel Chérin, Isaac Jourard, Jill J Weyers, David E Goertz, Brian K Courtney, F Stuart Foster
Coronary plaque morphology, including plaque size and fibrous cap thickness, is thought to contribute to the risk of plaque rupture and future cardiac events. Dual-frequency intravascular ultrasound has been proposed as a possible technique to visualize both large-scale features and superficial detail of coronary plaque; however, it has not been found to be feasible within the constraints of a clinically functional intravascular ultrasound catheter. In this study, we describe the design and fabrication of a dual-frequency catheter using a bidirectional transducer stack with center frequencies of approximately 30 and 80 MHz...
November 14, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29140981/wavelet-brain-angiography-suggests-arteriovenous-pulse-wave-phase-locking
#4
William E Butler
When a stroke volume of arterial blood arrives to the brain, the total blood volume in the bony cranium must remain constant as the proportions of arterial and venous blood vary, and by the end of the cardiac cycle an equivalent volume of venous blood must have been ejected. I hypothesize the brain to support this process by an extraluminally mediated exchange of information between its arterial and venous circulations. To test this I introduce wavelet angiography methods to resolve single moving vascular pulse waves (PWs) in the brain while simultaneously measuring brain pulse motion...
2017: PloS One
https://www.readbyqxmd.com/read/29140326/photoacoustic-endomicroscopy-based-on-a-mems-scanning-mirror
#5
Heng Guo, Chaolong Song, Huikai Xie, Lei Xi
In this Letter, we present a high-resolution photoacoustic endomicroscopy probe based on a microelectromechanical systems (MEMS) scanning mirror. The built-in optical assembly consists of a 0.7 mm graded-index (GRIN) lens for light focusing and a ϕ1  mm MEMS mirror to reflect and scan the beam. A miniaturized unfocused ultrasound transducer with a center frequency of 10 MHz is used for photoacoustic detection. Sharp blades, carbon fibers, and black tapes were utilized to evaluate the performance of the system...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29137778/the-use-of-ultrasound-to-reduce-internal-concentration-polarization-in-forward-osmosis
#6
Yongjun Choi, Tae-Mun Hwang, Sanghyun Jeong, Sangho Lee
Unlike reverse osmosis (RO) that is dominated by the hydraulic pressure differential, forward osmosis (FO) uses the osmotic pressure gradient as the driving force between a dilute feed solution and a concentrated draw solution across a membrane. High pressure is not required in FO, which means that FO can be used as an alternative to RO as an energy-saving separation process in desalination technology. However, a major limiting factor of the FO process is the internal concentration polarization (ICP). Because of the stagnant environment inside the porous supporting layer of a FO membrane, it is difficult to mitigate the ICP by simply increasing the shear stress or promoting turbulence...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137770/numerical-investigation-of-the-inertial-cavitation-threshold-under-multi-frequency-ultrasound
#7
Dingjie Suo, Bala Govind, Shengqi Zhang, Yun Jing
Through the introduction of multi-frequency sonication in High Intensity Focused Ultrasound (HIFU), enhancement of efficiency has been noted in several applications including thrombolysis, tissue ablation, sonochemistry, and sonoluminescence. One key experimental observation is that multi-frequency ultrasound can help lower the inertial cavitation threshold, thereby improving the power efficiency. However, this has not been well corroborated by the theory. In this paper, a numerical investigation on the inertial cavitation threshold of microbubbles (MBs) under multi-frequency ultrasound irradiation is conducted...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137760/a-novel-high-performance-nano-chemosensor-for-copper-ii-ion-based-on-an-ultrasound-assisted-synthesized-diphenylamine-based-schiff-base-design-fabrication-and-density-functional-theory-calculations
#8
Zohreh Parsaee, Pouya Haratipour, Milad Janghorban Lariche, Arash Vojood
A novel high selective colorimetric chemosensor was introduced based on a nano diphenyl-based Schiff base (H2L), 2,2'-((1E,1'E)-(((hexylazanediyl)bis(4,1-phenylene))bis(methanylylidene))bis(azanylylidene))bis(4-methylphenol) that synthesized using sonochemical method. H2L was characterized by FT-IR, MS, TGA, (1)H NMR, (13)C NMR, SEM and elemental analysis techniques, then fabricated as the portable strips for sensing copper (II) ions in aqueous media. The binding interaction between H2L and various metal ions was investigated by UV-Vis spectroscopic that showed favorable coordination toward Cu(2+) ion...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137756/the-effects-and-mechanism-of-phycocyanin-removal-from-water-by-high-frequency-ultrasound-treatment
#9
Cheng Liu, Zhen Cao, Siyuan He, Zhehao Sun, Wei Chen
The effects and mechanism of phycocyanin removal from water by high-frequency ultrasound treatment were studied. The efficiency of sonication treatment in removing proteins derived from algal cells was investigated, and the factors influencing the process, including the effects of coagulation, were also studied. In addition, sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), the three-dimensional fluorescence spectrum, and mass spectrum were used to illustrate the removal mechanism. The results indicated that phycocyanin can be degraded to the point where it is barely detectable in water samples after 180min of high-frequency sonication...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137734/ultrasound-irradiation-promoted-enzymatic-alcoholysis-for-synthesis-of-monoglyceryl-phenolic-acids-in-a-solvent-free-system
#10
Chunfang Xu, Haiping Zhang, Jie Shi, Mingming Zheng, Xia Xiang, Fenghong Huang, Junyong Xiao
Monoglyceryl phenolic acids (MPAs) were known as the natural hydrophilic antioxidants which could be used in different fields such as food, pharmaceutical, cosmetic etc. A novel enzymatic route of MPAs synthesis by the alcoholysis of phenolic acid ethyl esters with glycerol under ultrasound irradiation in solvent free system was developed. Optimization of reaction parameters shows that a high conversion of above 97.4% can be obtained under the following conditions: phenolic acid ethyl esters to glycerol molar ratio of 1:10, with 6% catalyst (Novozym 435), at 60°C and 200rpm, with ultrasound input of 250W, at 20kHz frequency...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137731/combined-effects-of-phase-shift-and-power-distribution-on-efficiency-of-dual-high-frequency-sonochemistry
#11
Nicholas B Waldo, Chad D Vecitis
In an effort to increase the efficiency of sonochemical reactors, this study investigates a single-source, dual-high-frequency ultrasound reactor. Experiments were conducted with a variety of piezoelectric crystals and reactor components, and for each reactor design a range of power distributions and phase shifts between the two frequencies were evaluated. Certain dual-frequency configurations produced up to a threefold increase in sonochemical efficiency, while others yeilded no improvement over a single frequency...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29128864/association-of-%C3%AE-2-hs-glycoprotein-with-neurogenic-heterotopic-ossification-in-patients-with-spinal-cord-injury
#12
Liwei Dong, Guodong Dong, Jianye Cao, Jing Zhang
BACKGROUND The aim of this study was to explore the relationship between the α2-HS glycoprotein concentrations in serum and the occurrence of neurogenic heterotopic ossification (NHO) in patients with spinal cord injury (SCI). MATERIAL AND METHODS During the period between January 2011 and January 2012, 75 patients (67 male) with paraplegia caused by spinal cord injury were enrolled. The patients were divided into 2 groups in accordance with the occurrence of heterotopic ossification based on the results high-frequency ultrasound on the bilateral hip joint...
November 12, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29127505/high-resolution-ultrasonography-of-the-normal-extratemporal-facial-nerve
#13
Hannes Wegscheider, Gerd Fabian Volk, Orlando Guntinas-Lichius, Bernhard Moriggl
The technical advances in sonography of the past decade have supported the rapid improvement of high-resolution imaging, which enables the quick visualization of peripheral nerves at relatively limited costs. Recently, the possibility of visualizing the extratemporal facial nerve (FN) has been considered. This manuscript describes the first systematic evaluation in cadavers, of a novel ultrasonographic approach with this specific aim. Eight cadaveric hemifaces were evaluated by means of high-frequency ultrasound with two linear (13 and 22 MHz) and a convex transducer (6...
November 10, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29127239/a-novel-method-for-quantitative-myocardial-contrast-echocardiography-in-mice
#14
Erika Alvarez, Nancy D Dalton, Yusu Gu, Dan Smith, Alice Luong, Masahiko Hoshijima, Kirk L Peterson, Joshua Rychak
The small size of the mouse heart frequently imparts technical challenges when applying conventional in vivo imaging methods for assessing heart function. Here we describe the use of high frequency ultrasound imaging in conjunction with a size-tuned blood pool contrast agent for quantitatively assessing myocardial perfusion in living mice. A perflurocarbon microbubble formulation exhibiting a narrow size distribution was developed, and echogenicity assessed at 18 MHz in vitro. Adult mice were subjected to permanent ligation of the left anterior descending artery...
November 10, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29126034/electrolytic-and-electro-irradiated-technologies-for-the-removal-of-chloramphenicol-in-synthetic-urine-with-diamond-anodes
#15
Salvador Cotillas, Engracia Lacasa, Cristina Sáez, Pablo Cañizares, Manuel A Rodrigo
Hospital effluents are a major source for the occurrence of pharmaceuticals in the environment. In this work, the treatment of synthetic urine polluted with chloramphenicol is studied by using three different conductive-diamond electrochemical oxidation technologies: electrolysis (single electrolysis), photoelectrolysis and high-frequency ultrasound sonoelectrolysis. These technologies were evaluated at 10 and 100 mA cm(-2). Results shows that not only chloramphenicol but also other organics contained in urine are completely mineralized by electrolysis...
November 1, 2017: Water Research
https://www.readbyqxmd.com/read/29121226/optical-frequency-domain-imaging-vs-intravascular-ultrasound-in-percutaneous-coronary-intervention-opinion-trial-one-year-angiographic-and-clinical-results
#16
Takashi Kubo, Toshiro Shinke, Takayuki Okamura, Kiyoshi Hibi, Gaku Nakazawa, Yoshihiro Morino, Junya Shite, Tetsuya Fusazaki, Hiromasa Otake, Ken Kozuma, Tetsuya Ioji, Hideaki Kaneda, Takeshi Serikawa, Toru Kataoka, Hisayuki Okada, Takashi Akasaka
Aims: Optical frequency domain imaging (OFDI) is a recently developed, light-based, high-resolution intravascular imaging technique. Intravascular ultrasound (IVUS) is a widely used, conventional imaging technique for guiding percutaneous coronary intervention (PCI). We aimed to demonstrate the non-inferiority of OFDI-guided PCI compared with IVUS-guided PCI in terms of clinical outcomes. Methods and results: We did a prospective, multicentre, randomized (ratio 1:1), active-controlled, non-inferiority study to compare head-to-head OFDI vs...
November 7, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29113126/a-robust-high-accuracy-ultrasound-indoor-positioning-system-based-on-a-wireless-sensor-network
#17
Jun Qi, Guo-Ping Liu
This paper describes the development and implementation of a robust high-accuracy ultrasonic indoor positioning system (UIPS). The UIPS consists of several wireless ultrasonic beacons in the indoor environment. Each of them has a fixed and known position coordinate and can collect all the transmissions from the target node or emit ultrasonic signals. Every wireless sensor network (WSN) node has two communication modules: one is WiFi, that transmits the data to the server, and the other is the radio frequency (RF) module, which is only used for time synchronization between different nodes, with accuracy up to 1 μ s...
November 6, 2017: Sensors
https://www.readbyqxmd.com/read/29108135/regimens-of-ultrasound-surveillance-for-twin-pregnancies-for-improving-outcomes
#18
REVIEW
Jane G Woolcock, Rosalie M Grivell, Jodie M Dodd
BACKGROUND: Increased ultrasound surveillance of twin pregnancies has become accepted practice due to the higher risk of complications. There is no current consensus however as to the method and frequency of ultrasound monitoring that constitutes optimal care. OBJECTIVES: To systematically review the effects of different types and frequency of ultrasound surveillance for women with a twin pregnancy on neonatal, fetal and maternal outcomes. SEARCH METHODS: We searched Cochrane Pregnancy and Childbirth's Trials Register, ClinicalTrials...
November 7, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29107274/focal-ablation-of-early-stage-prostate-cancer-candidate-selection-treatment-guidance-and-assessment-of-outcome
#19
REVIEW
Eric Edison, Taimur Tariq Shah, Hashim U Ahmed
Prostate cancer lesions smaller than 0.5 m(3), or Gleason pattern 3, are likely clinically insignificant. Clinically significant disease is often limited to a single index lesion. Focal ablation targets this index lesion, maintains oncological control, and minimizes complications by preserving healthy prostate tissue. Template mapping biopsy or multiparametric MRI-targeted biopsies are used to identify appropriate index lesions. Multiple energy modalities have been tested, including high-intensity frequency ultrasound, cryoablation, laser ablation, photodynamic therapy, focal brachytherapy, radiofrequency ablation, irreversible electroporation...
November 2017: Urologic Clinics of North America
https://www.readbyqxmd.com/read/29105475/-dynamic-changes-of-ultrasonographic-images-of-zusanli-st-36-region-during-deqi-of-acupuncture-needle-stimulation
#20
Xiao-Ming Wu, Xiang Mao, Xi Zhou, Zhao-Peng Xie, Yuan-Yi Zheng, Jian-Zhong Xu, Zhu-Xing Wang
OBJECTIVE: To observe the dynamic changes of ultrosonographic images of Zusanli (ST 36) area during Deqi after inserting acupuncture needles, so as to provide objective evidence for clinical Deqi. METHODS: Sixty healthy volunteers (30 men and 30 women) were recruited in the present study. The subjects were asked to take a supine position on a test-bed, sterilized disposable filiform needles were perpendicularly inserted into bilateral ST 36 till Deqi (without lifting, thrusting and twirling), when, high-resolution ultrasound scanning was conducted over the regional skeletal muscles by using a radio-frequency (5-12 MHz) coil probe (Philips IU Elite Ultrasound Diagnostic Instrument) after smearing a layer of gel at the skin of ST 36...
October 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
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