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https://www.readbyqxmd.com/read/29209483/guiding-histological-assessment-of-uterine-lesions-using-3d-in-vitro-ultrasonography-and-stereotaxis
#1
Lieselore Vandermeulen, Ann Cornelis, Christina Kjaergaard Rasmussen, Dirk Timmerman, Thierry Van den Bosch
Objective: To compare ultrasonographic features of uterine lesions with the findings at macroscopy and microscopy. Methods: Case series of ten consecutive women undergoing a hysterectomy for uterine pathology. A preoperative transvaginal ultrasound examination was performed. After hysterectomy, the uterus was re-evaluated by 3D in vitro ultrasonography and in vitro gel instillation sonography (iGIS). The lesion of interest was pinpointed by inserting an intramuscular injection needle using a free-hand 2D-ultrasound guided technique to focus the macroscopic and the microscopic examination by the pathologist...
June 2017: Facts, Views & Vision in ObGyn
https://www.readbyqxmd.com/read/29206666/immediate-effects-of-simultaneous-application-of-transcutaneous-electrical-nerve-stimulation-and-ultrasound-phonophoresis-on-active-myofascial-trigger-points-a-randomized-controlled-trial
#2
Mary Kamal Nassif Takla, Soheir Shethata Rezk-Allah Rezk
OBJECTIVE: was to investigate the efficacy of phonophoresis with combined therapy (PH-CT) on active myofascial trigger points (MTrPs). PARTICIPANTS: One hundred participants with acute mechanical neck pain and at least one active MTrP in the upper trapezius were randomly assigned into 4 equal groups. INTERVENTION: Groups consisted of; diclofenac PH-CT; diclofenac phonophoresis (PH); ultrasound (US) with coupling gel and sham-US; applied for 10 minutes over MTrP...
December 5, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29186007/anatomically-realistic-ultrasound-phantoms-using-gel-wax-with-3d-printed-moulds
#3
Efthymios Maneas, Wenfeng Xia, Daniil I Nikitichev, Batol Daher, Maniragav Manimaran, Rui Yen J Wong, Chia-Wei Chang, Benyamin Rahmani, Claudio Capelli, Silvia Schievano, Gaetano Burriesci, Sebastien Ourselin, Anna L David, Malcolm Finlay, Simeon J West, Tom Vercauteren, Adrien E Desjardins
Here we describe methods for creating tissue-mimicking ultrasound phantoms based on patient anatomy using a soft material called gel wax. To recreate acoustically realistic tissue properties, two additives to gel wax were considered: paraffin wax to increase acoustic attenuation, and solid glass spheres to increase backscattering. The frequency dependence of ultrasound attenuation was well described with a power law over the measured range of 3 to 10 MHz. With the addition of paraffin wax in concentrations of 0 to 8 w/w%, attenuation varied from 0...
November 29, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29184245/%C3%AE-lactoglobulin-microparticles-obtained-by-high-intensity-ultrasound-as-a-potential-delivery-system-for-bioactive-peptide-concentrate
#4
Tânia Tavares, Oscar L Ramos, F Xavier Malcata
This work attempted to assess the effect of high intensity ultrasound (HIUS) upon development of bio-based delivery systems, from β-lactoglobulin (β-Lg) gelled microparticles, for encapsulation of a bioactive peptide concentrate (PepC). Solutions of 150 g L-1 of commercial β-Lg and 30 g L-1 PepC, at various pH values (3.0, 4.0 and 5.5), were accordingly subjected to gelation for 30 min using a dry bath kept at 80 °C. The gelled systems were then exposed to HIUS at 0-4 °C, and the effect of processing time (2...
December 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/29182946/effect-of-pulse-duration-and-pulse-repetition-frequency-of-cavitation-histotripsy-on-erosion-at-the-surface-of-soft-material
#5
Yufeng Zhou, Xiaotong Wang
Cavitation histotripsy with the short pulse duration (PD) but high pulse repetition frequency (PRF) disintegrates the tissue at a fluid interface. However, longer PD and lower PRF are used in the other focused ultrasound applications, where the acoustic radiation force, streaming, and cavitation are different, and their effects on erosion are unknown. In this study, the erosion at the surface of phantom/ex vivo tissue and the characteristics of induced bubble cloud captured by high-speed photography, passive cavitation detection, and light transmission during histotripsy exposure at varied PDs and PRFs but the same duty cycle were compared...
November 22, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29181694/infection-prevention-and-control-in-ultrasound-best-practice-recommendations-from-the-european-society-of-radiology-ultrasound-working-group
#6
Christiane M Nyhsen, Hilary Humphreys, Roland J Koerner, Nicolas Grenier, Adrian Brady, Paul Sidhu, Carlos Nicolau, Gerhard Mostbeck, Mirko D'Onofrio, Afshin Gangi, Michel Claudon
OBJECTIVES: The objective of these recommendations is to highlight the importance of infection prevention and control in ultrasound (US), including diagnostic and interventional settings. METHODS: Review of available publications and discussion within a multidisciplinary group consistent of radiologists and microbiologists, in consultation with European patient and industry representatives. RECOMMENDATIONS: Good basic hygiene standards are essential...
November 27, 2017: Insights Into Imaging
https://www.readbyqxmd.com/read/29168072/estimates-for-the-acoustical-stimulation-and-heating-of-multiphase-biotissue
#7
T I Zohdi, R Krone
Low-intensity, unfocused, ultrasound-induced diathermy can produce undesired temperature increases at the interface of adjacent tissues within the body; particularly, at the interface of soft tissue and bone. This study provides a computational framework for predicting an upper bound on the temperature profile within a multiphase system composed of gel pad (water), tissue and bone from an input of acoustic energy, at frequencies and power levels consistent with applications of therapeutic hyperthermia. The model consists of solving a (one-dimensional) spatially discretized bioheat transfer equation via finite-difference method and updating the solution in time with a forward-Euler scheme...
November 22, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29161293/high-intensity-focused-ultrasound-ablation-around-the-tubing
#8
Jun Yang Siu, Chenhui Liu, Yufeng Zhou
High-intensity focused ultrasound (HIFU) has been emerging as an effective and noninvasive modality in cancer treatment with very promising clinical results. However, a small vessel in the focal region could be ruptured, which is an important concern for the safety of HIFU ablation. In this study, lesion formation in the polyacrylamide gel phantom embedded with different tubing (inner diameters of 0.76 mm and 3 mm) at varied flow speeds (17-339 cm/s) by HIFU ablation was photographically recorded. Produced lesions have decreased length (~30%) but slightly increased width (~6%) in comparison to that without the embedded tubing...
2017: PloS One
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/29126754/effect-of-pulsed-therapeutic-ultrasound-and-diosmin-on-skeletal-muscle-oxidative-parameters
#10
Luis Fernando Sousa Filho, Paula P Menezes, Dayanne Valéria Soares Santana, Bruno S Lima, Shanmugan Saravanan, Grace Kelly M Almeida, José Evaldo R Menezes Filho, Marta M B Santos, Adriano Antunes A S Araújo, Evaleide Diniz de Oliveira
Cyclodextrins (CDs) have been widely used as a promising alternative in the formation of inclusion complexes with poorly soluble molecules. From this perspective, the present study aimed to study the inclusion complexes of diosmin in β-cyclodextrin, chemically quantify the diosmin-in-gel preparation and analyze the stability of the gels. Furthermore, we evaluated the effect of therapeutic pulsed ultrasound (TPU) in association with the gel-diosmin complex on the parameters of muscle damage and oxidative stress in rats...
November 7, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29115351/a-pure-magnetite-hydrogel-synthesis-properties-and-possible-applications
#11
Elizaveta I Anastasova, Vladimir Ivanovski, Anna F Fakhardo, Artem I Lepeshkin, Suheir Omar, Andrey S Drozdov, Vladimir V Vinogradov
A magnetite-only hydrogel was prepared for the first time by weak base mediated gelation of stable magnetite hydrosols at room temperature. The hydrogel consists of 10 nm magnetite nanoparticles linked by interparticle Fe-O-Fe bonds and has the appearance of a dark-brown viscous thixotropic material. The water content in the hydrogel could be up to 93.6% by mass while volume fraction reaches 99%. The material shows excellent biocompatibility and minor cytotoxic effects at concentrations up to 207 μg mL(-1)...
November 22, 2017: Soft Matter
https://www.readbyqxmd.com/read/29112910/biomechanical-characterization-of-ex-vivo-human-brain-using-ultrasound-shear-wave-spectroscopy
#12
Emmanuel Nicolas, Samuel Callé, Stéphane Nicolle, David Mitton, Jean-Pierre Remenieras
The characterization of brain tissue is crucial to better understand neurological disorders. Mechanical characterization is an emerging tool in that field. The purpose of this work was to validate a transient ultrasound technique aimed at measuring dispersion of mechanical parameters of the brain tissue. The first part of this work was dedicated to the validation of that technique by comparing it with two proven rheology methods: a rotating plate rheometer, and a viscoelastic spectroscopy apparatus. Experiments were done on tissue mimicking gels...
November 4, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29105475/-dynamic-changes-of-ultrasonographic-images-of-zusanli-st-36-region-during-deqi-of-acupuncture-needle-stimulation
#13
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
https://www.readbyqxmd.com/read/29098986/gold-nanoparticle-nucleated-cavitation-for-enhanced-high-intensity-focused-ultrasound-therapy
#14
James R McLaughlan, David M J Cowell, Steven Freear
High intensity focused ultrasound (HIFU) or focused ultrasound surgery (FUS) is a non-invasive technique for the treatment of cancerous tissue, which is limited by difficulties in getting real-time feedback on treatment progress and long treatment durations. The formation and activity of acoustic cavitation, specifically inertial cavitation, during HIFU exposures has been demonstrated to enhance heating rates. However, without the introduction of external nuclei its formation an activity can be unpredictable, and potentially counterproductive...
November 3, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29093182/a-completely-biological-off-the-shelf-arteriovenous-graft-that-recellularizes-in-baboons
#15
Zeeshan H Syedain, Melanie L Graham, Ty B Dunn, Timothy O'Brien, Sandra L Johnson, Robert J Schumacher, Robert T Tranquillo
Prosthetic arteriovenous grafts (AVGs) conventionally used for hemodialysis are associated with inferior primary patency rates and increased risk of infection compared with autogenous vein grafts. We tissue-engineered an AVG grown from neonatal human dermal fibroblasts entrapped in bovine fibrin gel that is then decellularized. This graft is both "off-the-shelf" (nonliving) and completely biological. Grafts that are 6 mm in diameter and about 15 cm in length were evaluated in a baboon model of hemodialysis access in an axillary-cephalic or axillary-brachial upper arm AVG construction procedure...
November 1, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29068741/attitudes-towards-three-ultrasound-guided-vascular-access-techniques-in-a-paediatric-emergency-department
#16
Carrie Ng, Lorraine Ng, David O Kessler
BACKGROUND: although nurses often place peripheral intravenous (IV) catheters, little is known about their perceptions regarding use of ultrasound guidance. AIM: the authors aimed to determine paediatric emergency department nurses' attitudes toward ultrasound-guided IV access techniques and assessed practice change after training. METHOD: In a cross-sectional study of nurses, they had didactic and hands-on practice sessions, using three short-axis ultrasound-guided IV access techniques on gel models...
October 26, 2017: British Journal of Nursing: BJN
https://www.readbyqxmd.com/read/29067713/feature-analysis-of-ultrasound-elastography-image-for-quantitative-assessment-of-cutaneous-carcinoma
#17
M A Morris, C M Ring, R Managuli, B Saboury, D Mehregan, E Siegel, B Dasgeb
BACKGROUND: To evaluate the feasibility of using quantitative texture features computed from high frequency ultrasound and ultrasound elastography (USE) images in the discrimination of benign from malignant skin lesions. METHODS: A commercial ultrasound system with a 14 MHz transducer was used to visualize skin lesions requiring biopsy on clinical evaluation. Patients were enrolled over a 6-month period and imaged prospectively by operators blind to the histopathologic diagnosis...
October 25, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/29063693/occupational-allergic-contact-dermatitis-caused-by-isothiazolinones-in-ultrasound-gel-2-cases
#18
Monica Corazza, Graziana Amendolagine, Dario Cristofaro, Tatiana Bernardi, Caterina Foti, Paolo Romita, Alessandro Borghi
No abstract text is available yet for this article.
November 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/29060529/measurement-of-surface-acoustic-waves-in-high-frequency-ultrasound-preliminary-results
#19
Ana Cecilia Saavedra, Fernando Zvietcovich, Roberto J Lavarello, Benjamin Castaneda
Skin lesions change elastic properties near the surface. In the last decades, several non-invasive elastography techniques have been developed for detecting the mechanical properties of tissue. In particular, harmonic elastography is characterized for inducing shear wave propagation by an external vibrator in order to estimate shear modulus. However, near the boundary region, propagation is governed by surface acoustic waves (SAW). This paper combines crawling waves elastography with a high-frequency ultrasound (HFUS) system for the estimation of the SAW-to-shear compensation factor when ultrasound (US) gel is used as coupling interface...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29057289/acoustic-beam-anomalies-in-automated-breast-imaging
#20
Rungroj Jintamethasawat, Xiaohui Zhang, Paul L Carson, Marilyn A Roubidoux, Oliver D Kripfgans
In B-mode imaging of the dependent or compressed breast, wave incidence at steep angles can change propagation directions and induce areas of signal dropout. To evaluate the image anomalies in reasonable simulation times, we performed full-wave studies for center frequencies of 1 and 4 MHz. Speed of sound and density of skin, typical coupling gel, and adipose tissue were assigned to the test couplant. Compared with commercial gel, skin-like couplant reduced the dropout area at 1 and 4 MHz by 57.1% and 96...
October 2017: Journal of Medical Imaging
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