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https://www.readbyqxmd.com/read/28818480/-infection-control-practices-while-performing-prostate-biopsies-in-france-a-ciafu-survey
#1
P Leduc, J D Doublet, F Bruyère, S Malavaud
In 2008, the French Public Health Committee admitted that associating ultrasound probe protection, and related precautions, and low-level disinfection would be equivalent to the intermediate level disinfection. In 2010, the French Urology Association (AFU) updated guidelines regarding trans-rectal prostate biopsies, namely preventive measures related to cross-transmission of infections. We report an evaluation of compliance to them, driven in 2016 by AFU's infection committee. Although not recommended, almost one third of the urologists still perform biopsies under general anesthesia, and two thirds of them ask for a urine culture before biopsies...
August 14, 2017: Progrès en Urologie
https://www.readbyqxmd.com/read/28816322/ultrasonication-enhanced-gelation-properties-of-a-versatile-amphiphilic-formamidine-based-gelator-exhibiting-both-organogelation-and-hydrogelation-abilities
#2
Jürgen Bachl, Diego Sampedro, Judith Mayr, David Díaz Díaz
We describe the preparation of a novel amphiphilic gelator built from a formamidine core, which is able to form a variety of physical organogels and hydrogels at concentrations ranging from 15 to 150 mg mL(-1). Interestingly, ultrasound treatment of isotropic solutions (i.e., gel-precursor) resulted in a remarkable enhancement of the gelation kinetics as well as the gelation scope and characteristic gel properties (e.g., critical gelation concentration, gel-to-sol transition temperature, viscoelastic moduli) in comparison to the heating-cooling protocol typically used to obtain supramolecular gels...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816281/-application-of-flurbiprofen-axetil-in-pain-management-associated-during-transrectal-ultrasound-guided-prostate-biopsy
#3
K Lan, W B Yang, X W Zhang, W J Bai, Q Li, T Xu
OBJECTIVE: To examine the effects of perioperative intravenous administration of flurbiprofen axetil (FA) on pain associated with transrectal ultrasound-guided prostate biopsy. METHODS: This was a randomized,controlled study. Eighty-one patients who underwent 12 core prostate biopsy were included in the study. The patients were randomly assigned to one of three groups (n=27 in each) by type of procedure during prostate biopsy. Group intrarectal local anesthesia (IRLA) received intrarectal 5% (0...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28809083/laser-induced-focused-ultrasound-for-cavitation-treatment-toward-high-precision-invisible-sonic-scalpel
#4
Taehwa Lee, Wei Luo, Qiaochu Li, Hakan Demirci, L Jay Guo
Beyond the implementation of the photoacoustic effect to photoacoustic imaging and laser ultrasonics, this study demonstrates a novel application of the photoacoustic effect for high-precision cavitation treatment of tissue using laser-induced focused ultrasound. The focused ultrasound is generated by pulsed optical excitation of an efficient photoacoustic film coated on a concave surface, and its amplitude is high enough to produce controllable microcavitation within the focal region (lateral focus <100 µm)...
August 15, 2017: Small
https://www.readbyqxmd.com/read/28802019/effects-of-ultrasound-treatment-on-physicochemical-functional-properties-and-antioxidant-activity-of-whey-protein-isolate-in-the-presence-of-calcium-lactate
#5
Zhanmei Jiang, Kun Yao, Xiangying Yuan, Zhishen Mu, Zengli Gao, Juncai Hou, Lianzhou Jiang
BACKGROUND: The aim of this study was to investigate the effects of ultrasound applied at various powers (0, 200, 400, 600 or 800 W) and for different times (20 or 40 min) on the physicochemical, functional properties and antioxidant activities of whey protein isolate (WPI) dispersions in the presence of 1.20 mmol L(-1) calcium lactate. RESULTS: Surface hydrophobicity and free sulfhydryl group of the WPI dispersions containing 1.2 mmol L(-1) calcium lactate were significantly enhanced after sonication...
August 12, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28796487/endogenous-catalytic-generation-of-o2-bubbles-for-in-situ-ultrasound-guided-high-intensity-focused-ultrasound-ablation
#6
Tianzhi Liu, Nan Zhang, Zhigang Wang, Meiying Wu, Yu Chen, Ming Ma, Hangrong Chen, Jianlin Shi
High intensity focused ultrasound (HIFU) surgery generally suffers from poor precision and low efficiency in clinical application, especially for cancer therapy. Herein, a multiscale hybrid catalytic nanoreactor (catalase@MONs, abbreviated as C@M) has been developed as a tumor-sensitive contrast and synergistic agent (C&SA) for ultrasound-guided HIFU cancer surgery, by integrating dendritic-structured mesoporous organosilica nanoparticles (MONs) and catalase immobilized in the large open pore channels of MONs...
August 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28777479/an-interposed-pad-in-open-chest-echocardiographic-porcine-scans-for-mimicking-ultrasound-signal-attenuation-in-a-human-chest
#7
Randall R Kinnick, Minako Katayama, Marek Belohlavek
Opening a chest in an experimental echocardiographic animal study eliminates ultrasound signal attenuation by the chest wall. We developed a scanning technique that involves the use of an attenuative pad created from a mixture of urethane and titanium dioxide. The pad was interposed within transmission gel between the transducer face and cardiac surface in open-chest scans in a porcine model. Comparative measurements of left ventricular echogenicity without and with the pad demonstrate that the pad reproducibly causes ultrasound signal attenuation that closely mimics chest attenuation in clinical transthoracic echocardiographic studies...
August 4, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28757084/outbreak-of-health-care-associated-burkholderia-cenocepacia-bacteremia-and-infection-attributed-to-contaminated-sterile-gel-used-for-central-line-insertion-under-ultrasound-guidance-and-other-procedures
#8
Ramon Z Shaban, Samuel Maloney, John Gerrard, Peter Collignon, Deborough Macbeth, Marilyn Cruickshank, Anna Hume, Amy V Jennison, Rikki M A Graham, Haakon Bergh, Heather L Wilson, Petra Derrington
BACKGROUND: We report an outbreak of Burkholderia cenocepacia bacteremia and infection in 11 patients predominately in intensive care units caused by contaminated ultrasound gel used in central line insertion and sterile procedures within 4 hospitals across Australia. METHODS: Burkholderia cenocepacia was first identified in the blood culture of a patient from the intensive care unit at the Gold Coast University Hospital on March 26, 2017, with 3 subsequent cases identified by April 7, 2017...
July 27, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28744328/ultrasonographic-imaging-and-anti-inflammatory-therapy-of-muscle-and-tendon-injuries-using-polymer-nanoparticles
#9
Gi-Wook Kim, Changsun Kang, Young-Bin Oh, Myoung-Hwan Ko, Jeong-Hwan Seo, Dongwon Lee
Ultrasonography is a reliable diagnostic modality for muscle and tendon injuries, but it has been challenging to find right diagnosis of minor musculoskeletal injuries by conventional ultrasonographic imaging. A large amount of hydrogen peroxide (H2O2) are known to be generated during tissue damages such as mechanical injury and therefore H2O2 holds great potential as a diagnostic and therapeutic marker for mechanical injuries in the musculoskeletal system. We previously developed poly(vanillyl alcohol-co-oxalate) (PVAX), which rapidly scavenges H2O2 and exerts antioxidant and anti-inflammatory activity in H2O2-associated diseases...
2017: Theranostics
https://www.readbyqxmd.com/read/28741596/the-response-of-mri-contrast-parameters-in-in-vitro-tissues-and-tissue-mimicking-phantoms-to-fractionation-by-histotripsy
#10
Steven P Allen, Eli Vlaisavljevich, Jiaqi Shi, Luis Hernandez-Garcia, Charles A Cain, Zhen Xu, Timothy L Hall
Histotripsy is a non-invasive, focused ultrasound lesioning technique that can ablate precise volumes of soft tissue using a novel mechanical fractionation mechanism. Previous research suggests that magnetic resonance imaging (MRI) may be a sensitive image-based feedback mechanism for histotripsy. However, there are insufficient data to form some unified understanding of the response of the MR contrast mechanisms in tissues to histotripsy. In this paper, we investigate the response of the MR contrast parameters R1, R2, and the apparent diffusion coefficient (ADC) to various treatment levels of histotripsy in in vitro porcine liver, kidney, muscle, and blood clot as well in formulations of bovine red blood cells suspended in agar gel...
August 18, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28733010/effects-of-high-intensity-ultrasound-on-acid-induced-gelation-properties-of-whey-protein-gel
#11
Xue Shen, Changhui Zhao, Mingruo Guo
Pre-heated whey protein isolate (WPI) solution (10% w/v, 85°C for 30min) was prepared and subjected to high-intensity ultrasound (HUS, 20kHz) at different durations (5-40min) before acidification to determine the effects of HUS on glucono-δ-lactone (GDL)-induced gelation properties of whey protein gel. Results showed that HUS reduced the particle size and increased surface free sulfhydryl groups of pre-heated whey protein solution. Free sulfhydryl (-SH) content of the acid-induced WPI gels (GIWG) and protein solubility in presence of 8M urea were significantly reduced (P<0...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732974/the-effect-of-ultrasonic-irradiation-on-the-structure-morphology-and-photocatalytic-performance-of-zno-nanoparticles-by-sol-gel-method
#12
Reza Mahdavi, S Siamak Ashraf Talesh
In this research, the effect of ultrasonic irradiation power (0, 75, 150 and 200W) and time (0, 5, 15 and 20min) on the structure, morphology and photocatalytic activity of zinc oxide nanoparticles synthesized by sol-gel method was investigated. Crystallographic structures and the morphologies of the resultant powders were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The XRD patterns showed that ZnO samples were crystallized in their pure phase. The purity of samples was increased by increasing the ultrasonic irradiation power and time...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732930/transglutaminase-set-colloidal-properties-of-wheat-gluten-with-ultrasound-pretreatments
#13
Xin-Sheng Qin, Qiao-Qiao Sun, Yan-Yan Zhao, Xi-Yang Zhong, Dong-Dong Mu, Shao-Tong Jiang, Shui-Zhong Luo, Zhi Zheng
The low solubility of wheat gluten limits its accessibility. This work aimed to study the impact of ultrasonic pretreatments on the gelation of wheat gluten. The pretreatments included ultrasound combined with alkali, urea, Na2SO3, with or without the addition of transglutaminase (TGase). The gel strength of wheat gluten was 287g/cm(2) after treatment with Na2SO3/ultrasound/TGase. The free sulfhydryl and disulfide bond content was significantly affected by ultrasound treatment. After treatments including TGase crosslinking, the molecular weight of wheat gluten complexes became larger...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28727616/iterative-reconstruction-may-improve-diagnosis-of-gout-an-ex-vivo-bio-phantom-dual-energy-computed-tomography-study
#14
Torsten Diekhoff, Maximilian Kotlyarov, Jürgen Mews, Bernd Hamm, Kay-Geert Armin Hermann
OBJECTIVES: We hypothesize that, compared with filtered back projection (FBP), iterative reconstruction (IR) increases the detected volume of uric acid, which serves as a measure of the sensitivity of the method, and therefore allows examinations with lower radiation exposure. Thus, the aim of our study was to evaluate the role of IR in dual-energy computed tomography (DECT) for gout assessment and volumetry in an ex vivo gout model using an epoxy phantom and a biophantom. MATERIALS AND METHODS: We prepared specimens with different concentrations of monosodium uric acid in ultrasound gel (30%-50%) and inserted them into an epoxy-based phantom and a porcine foreleg...
July 19, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28714565/mri-compatible-breast-rib-phantom-for-evaluating-ultrasonic-thermal-exposures
#15
Georgios Menikou, Marinos Yiannakou, Christos Yiallouras, Cleanthis Ioannides, Christakis Damianou
INTRODUCTION: The target of this study was the development of a magnetic resonance imaging (MRI) compatible breast phantom for focused ultrasound which includes plastic (ABS) ribs. The objective of the current study was the evaluation of a focused ultrasound procedure using the proposed phantom that eliminates rib heating. MATERIAL AND METHODS: The proposed phantom was evaluated using two different focused ultrasound exposures. The surrounding breast tissue was mimicked using an agar-silica-evaporation milk gel (2% w/v - 2% w/v - 40% v/v)...
July 17, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28702357/a-numerical-analysis-of-a-semi-dry-coupling-configuration-in-photoacoustic-computed-tomography-for-infant-brain-imaging
#16
Najme Meimani, Nina Abani, Juri Gelovani, Mohammad R N Avanaki
In the application of photoacoustic human infant brain imaging, debubbled ultrasound gel or water is commonly used as a couplant for ultrasonic transducers due to their acoustic properties. The main challenge in using such a couplant is its discomfort for the patient. In this study, we explore the feasibility of a semi-dry coupling configuration to be used in photoacoustic computed tomography (PACT) systems. The coupling system includes an inflatable container consisting of a thin layer of Aqualene with ultrasound gel or water inside of it...
September 2017: Photoacoustics
https://www.readbyqxmd.com/read/28648918/acoustic-and-elastic-properties-of-glycerol-in-oil-based-gel-phantoms
#17
Luciana C Cabrelli, Felipe W Grillo, Diego R T Sampaio, Antonio A O Carneiro, Theo Z Pavan
Phantoms are important tools for image quality control and medical training. Many phantom materials have been proposed for ultrasound; most of them use water as the solvent, but these materials have disadvantages such as dehydration and low temporal stability if not properly stored. To overcome these difficulties, copolymer-in-oil gel was proposed as an inert and stable material; however, speed of sound for these materials is still lower than what is described for most biological tissues. Here, we propose the glycerol dispersion in oil-based gels to modify the acoustic and elastic properties of copolymer-in-oil phantoms...
June 22, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28642054/development-of-a-tailored-thyroid-gland-phantom-for-fine-needle-aspiration-cytology-by-three-dimensional-printing
#18
Masayuki Baba, Keitaro Matsumoto, Naoya Yamasaki, Hisakazu Shindo, Hiroshi Yano, Megumi Matsumoto, Ryota Otsubo, Murray John Lawn, Naoto Matsuo, Ikuo Yamamoto, Shigekazu Hidaka, Takeshi Nagayasu
BACKGROUND: Fine-needle aspiration cytology (FNAC) is a challenging and risky procedure for inexperienced clinicians to perform because of the proximity of the thyroid to the jugular veins, carotid arteries, and trachea. A phantom model for transfixion practice would help train clinicians in FNAC. OBJECTIVE: To fabricate a tailored phantom with consideration for authenticity of size, touch, feel, and ultrasonographic (US) characteristics. METHODS: A three-dimensional (3D) digital model of the human neck was reconstructed from computed tomography data of a subject...
June 19, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28641910/dependence-of-boiling-histotripsy-treatment-efficiency-on-hifu-frequency-and-focal-pressure-levels
#19
Tatiana D Khokhlova, Yasser A Haider, Adam D Maxwell, Wayne Kreider, Michael R Bailey, Vera A Khokhlova
Boiling histotripsy (BH) is a high-intensity focused ultrasound (HIFU)-based method of mechanical tissue fractionation that utilizes millisecond-long bursts of HIFU shock waves to cause boiling at the focus in milliseconds. The subsequent interaction of the incoming shocks with the vapor bubble mechanically lyses surrounding tissue and cells. The acoustic parameter space for BH has been investigated previously and an inverse dependence between the HIFU frequency and the dimensions of a BH lesion has been observed...
September 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28633855/nanocomposites-synthesis-characterization-and-its-application-to-removal-azo-dyes-using-ultrasonic-assisted-method-modeling-and-optimization
#20
Sima Porhemmat, Mehrorang Ghaedi, Ali Reza Rezvani, Mohammad Hossein Ahmadi Azqhandi, Ali Akbar Bazrafshan
S-doped and Cu- and Co-doped TiO2 was synthesized by a sol-gel method and characterized by FE-SEM, XRD, EDX and FTIR. The Co/Cu/S-TiO2 nanocomposite loaded on the activated carbon as new nanoadsorbent was used for simultaneous removal of methylene blue (MB) and sunset yellow (SY) from aqueous solution by ultrasonic-assisted adsorption method. In this work, central composite design (CCD) and adaptive neuro-fuzzy inference system (ANFIS) as a support tool for examining data and making prediction are used to recognize and predict the removal percentage in MB and SY dye solution of different concentrations...
September 2017: Ultrasonics Sonochemistry
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