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https://www.readbyqxmd.com/read/29447940/the-relationship-between-plasma-vascular-endothelial-growth-factor-and-erythrocyte-2-3-bisphosphoglycerate-the-putative-role-of-chronic-hypoxia
#1
B K Puri, J A Monro
The non-invasive assessment of chronic tissue hypoxia is difficult. Pulse oximetry only allows the peripheral oxygen saturation to be measured, while the detection of hyperlactataemia needs to take into account the fact that the accumulation of lactic acid may result from several causes other than prolonged tissue hypoxia. Arterial blood oxygen measurement is invasive and often does not give a good indication of the level of tissue hypoxia. Other suggested methods include the use of positron emission tomography, magnetic resonance T2 ∗ relaxation time measurement, photoacoustics and high-frequency ultrasound...
March 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29439307/ultrasound-combined-transcutaneous-electrical-nerve-stimulation-ultratens-versus-phonophoresis-of-piroxicam-php-in-symptomatic-knee-osteoarthritis-a-randomized-double-blind-controlled-trial
#2
Jariya Boonhong, Phitsanu Suntornpiyapan
BACKGROUND: Ultrasound combined with transcutaneous electrical nerve stimulation (UltraTENS) and phonophoresis of piroxicam (PhP) are combined modality therapy that frequently used in musculoskeletal pain including knee osteoarthritis (OA). But it is lack of a good clinical trial to prove and compare their effects. OBJECTIVE: To compare the effects of UltraTENS with PhP on mild to moderate degree of symptomatic knee OA. METHODS: Sixty-one patients (55 women), mean age of 63...
February 2, 2018: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29429739/crystallization-and-solid-solution-attainment-of-samarium-doped-zno-nanorods-via-a-combined-ultrasonic-microwave-irradiation-approach
#3
Kamran Dastafkan, Armin Kiani, Ali Obeydavi, Mohammad Rahimi
An advanced sol-gel method is developed via combined ultrasound-microwave irradiation and utilized for the crystallization of pristine and samarium doped zinc oxide nanorods. Organic structure directing agents directed one dimensional growth and air-annealing was applied as post-thermal treatment. Microstructural, optical, and solid state survey was pursued by PXRD, FESEM, TEM, EDS, FTIR, DRS, PL, micro-Raman, H2-TPR, and ESR techniques. Phase analysis by diffraction patterns confirmed the efficacy of irradiation strategy as it improves the crystallinity degree, expedites the hexagonal close pack morphology, and conducts lattice imperfection...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29429707/investigation-of-stability-consistency-and-oil-oxidation-of-emulsion-filled-gel-prepared-by-inulin-and-rice-bran-oil-using-ultrasonic-radiation
#4
Newsha Nourbehesht, Hajar Shekarchizadeh, Nafiseh Soltanizadeh
Inulin, rice bran oil and rosemary essential oil were used to produce high quality emulsion filled gel (EFG) using ultrasonic radiation. Response surface methodology was used to investigate the effects of oil content, inulin content and power of ultrasound on the stability and consistency of prepared EFG. The process conditions were optimized by conducting experiments at five different levels. Second order polynomial response surface equations were developed indicating the effect of variables on EFG stability and consistency...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29429705/synthesis-of-novel-sonocatalyst-er3-yalo3-nb2o5-and-its-application-for-sonocatalytic-degradation-of-methamphetamine-hydrochloride
#5
Chunsheng Wei, Kuiyu Yi, Guangsheng Sun, Jun Wang
The composited sonocatalyst Er3+:YAlO3/Nb2O5 was prepared by ultrasonic dispersion and high temperature calcinations method. The microstructure of Er3+:YAlO3 was prepared via sol-gel method and Nb2O5 was prepared by hydrothermal method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDX), ultraviolet-visible (UV-vis) spectra and photoluminescence (PL) spectra, respectively. The sonocatalytic decomposition activity of composite sonocatalyst Er3+:YAlO3/Nb2O5 was investigated by using ultrasound as sound source and methamphetamine hydrochloride as the target degradation product...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29429700/energy-efficient-room-temperature-synthesis-of-cardanol-based-novolac-resin-using-acoustic-cavitation
#6
Nilesh L Jadhav, Sai Krishna C Sastry, Dipak V Pinjari
The present study deals with synthesis of cardanol-cased novolac (CBN) resin by the condensation reaction between cardanol and formaldehyde using acoustic cavitation. It is a step-growth polymerization which occurs in the presence of an acid catalyst such as adipic acid, citric acid, oxalic acid, sulphuric acid and hydrochloric acid. CBN was also synthesised by a conventional method for the sake of comparison of techniques. The effect of molar ratio, effect of catalyst, effect of different catalyst and effect of power on the conversion to CBN has been studied...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29416451/which-is-better-for-pain-reduction-during-transrectal-ultrasound-guided-biopsy-of-the-prostate-intravenous-diazepam-local-periprostatic-nerve-block-or-combination-controlled-randomized-study
#7
Haisam Atta, Mohamed F Mostafa, Mahmoud Shalaby
Background: Transrectal ultrasound-guided prostate biopsy (TRUSPB) is considered the procedure of choice for the diagnosis of prostate cancer. Men undergoing this biopsy experience high psychological stress. Different studies recommend techniques as sedation, lidocaine gel intrarectally, periprostatic nerve block alone, or nitrous oxide inhalation as effective methods of analgesia during procedural-related pain or discomfort. We evaluated three techniques for pain relief during TRUSPB and evaluated if there was any increase in the incidence of complications when employing either technique...
January 2018: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/29368236/experimental-study-of-sector-and-linear-array-ultrasound-accuracy-and-the-influence-of-navigated-3d-reconstruction-as-compared-to-mri-in-a-brain-tumor-model
#8
Max Siekmann, Thomas Lothes, Ralph König, Christian Rainer Wirtz, Jan Coburger
PURPOSE: Currently, intraoperative ultrasound in brain tumor surgery is a rapidly propagating option in imaging technology. We examined the accuracy and resolution limits of different ultrasound probes and the influence of 3D-reconstruction in a phantom and compared these results to MRI in an intraoperative setting (iMRI). METHODS: An agarose gel phantom with predefined gel targets was examined with iMRI, a sector (SUS) and a linear (LUS) array probe with two-dimensional images...
January 24, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29355307/fluorescent-hydrogel-generated-conveniently-from-a-perylene-tetracarboxylate-derivative-of-titanium-iv-alkoxide
#9
Dan-Hong Zou, Peng Wang, Wen Luo, Jin-Le Hou, Qin-Yu Zhu, Jie Dai
Organic gelators and metal-coordination frameworks based on perylene derivatives as functional materials have attracted great attention because of their intense fluorescence emission as well as unique electronic and photonic properties. We report here the structures and properties of a luminescent titanium(IV) coordination compound of a perylene tetracarboxylate (PTC) derivative, [Ti2(OiPr)6(L1)(phen)2] (1), along with its two naphthalene analogues, [Ti2(OiPr)6(L2)(phen)2] (2) and [Ti2(OiPr)6(L2)(bpy)2] (3), where L1 = 3,9-dicarboxylate-(4,10-diisopropanolcarboxylate)perylene, phen = 1,10-phenanthroline, L2 = 1,5-dicarboxylate-(2,6-diisopropanolcarboxylate)naphthalene, and bpy = 2,2'-bipyridine...
January 22, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29344948/glycation-of-ovalbumin-after-high-intensity-ultrasound-pretreatment-effects-on-conformation-igg-ige-binding-ability-and-antioxidant-activity
#10
Wenhua Yang, Zongcai Tu, Hui Wang, Lu Zhang, Qidong Song
BACKGROUND: Ovalbumin (OVA), a protein with excellent nutritional and processing properties, is the major allergen of hen egg white. Previous study showed that high-intensity ultrasound treatment increased the IgG and IgE binding abilities by unfolding the conformational structure of OVA. It may allow modifying the IgG and IgE binding of OVA by combining high-intensity ultrasound with other methods, such as glycation, a promising method for the improvement of protein properties. RESULTS: Glycation with mannose (M) after ultrasound pretreatment at 0-600 W significantly reduced the IgG and IgE binding abilities and dramatically enhanced the antioxidant activity of OVA-M conjugates, with the lowest values of IgG and IgE binding and highest values of antioxidant capacity observed at 600W...
January 18, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29336757/radiofrequency-thermal-ablation-heat-energy-transfer-in-an-ex-vivo-model
#11
Shivani Thakur, Sandi Lavito, Elizabeth Grobner, Mark Grobner
Little work has been done to consider the temperature changes and energy transfer that occur in the tissue outside the vein with ultrasound-guided vein ablation therapy. In this experiment, a Ex-Vivo model of the human calf was used to analyze heat transfer and energy degradation in tissue surrounding the vein during endovascular radiofrequency ablation (RFA). A clinical vein ablation protocol was used to determine the tissue temperature distribution in 10 per cent agar gel. Heat energy from the radiofrequency catheter was measured for 140 seconds at fixed points by four thermometer probes placed equidistant radially at 0...
December 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/29328522/cassava-flour-slurry-as-a-low-cost-alternative-to-commercially-available-gel-for-obstetrical-ultrasound-a-blinded-non-inferiority-trial-comparison-of-image-quality
#12
Aleha Aziz, Pe'er Dar, Francine Hughes, Clemencia Solorzano, Mundenga Mutendi Muller, Christian Salmon, Margaret Salmon, Nerys Benfield
OBJECTIVE: To evaluate the quality of ultrasound images obtained with cassava flour slurry (CFS) compared to conventional gel in order to determine objectively whether CFS could be a true low-cost alternative. DESIGN: Blinded non-inferiority trial. SETTING: Obstetrical ultrasound unit in an academic medical center. POPULATION OR SAMPLE: Women with a singleton pregnancy, undergoing anatomy ultrasounds. METHODS: Thirty pregnant women had standard biometry measures obtained with CFS and conventional gel...
January 12, 2018: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/29282062/supraspinatus-muscle-elasticity-measured-with-real-time-shear-wave-ultrasound-elastography-correlates-with-mri-spectroscopic-measured-amount-of-fatty-degeneration
#13
Fabian Gilbert, Detlef Klein, Andreas Max Weng, Herbert Köstler, Benedikt Schmitz, Jonas Schmalzl, Dirk Böhm
BACKGROUND: Fatty Degeneration (FD) of the rotator cuff muscles influences functional and anatomical outcome after rotator cuff repair. The MRI based estimation of fatty degeneration is the gold standard. There is some evidence that Ultrasound elastography (EUS) can detect local differences of tissue stiffness in muscles and tendons. Shear-wave elastography (SWE) was evaluated to determine the extent to which shear wave velocity was associated with measures of fatty degeneration. MRI-spectroscopic fat measurement was used as a reference to quantify the amount of fat in the muscle belly...
December 28, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29241704/development-and-characterization-of-an-anthropomorphic-breast-phantom-for-permanent-breast-seed-implant-brachytherapy-credentialing
#14
Michael Roumeliotis, Sarah Quirk, Matthew Skarsgard, Tiana Trumpour, Elizabeth Watt, Tyler Meyer
PURPOSE: To develop an anthropomorphic breast phantom for use in credentialing of permanent breast seed implant brachytherapy. METHODS AND MATERIALS: A representative external contour and target volume was used as the basis of mold manufacturing for anthropomorphic breast phantom development. Both target and normal tissue were composed of gel-like materials that provide suitable computed tomography and ultrasound contrast for brachytherapy delivery. The phantoms were evaluated for consistency in construction (target location) and Hounsfield unit (computed tomography contrast)...
December 11, 2017: Brachytherapy
https://www.readbyqxmd.com/read/29209483/guiding-histological-assessment-of-uterine-lesions-using-3d-in-vitro-ultrasonography-and-stereotaxis
#15
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
#16
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
#17
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 C 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 3-10 MHz. With the addition of paraffin wax in concentrations of 0 to 8 w/w%, attenuation varied from 0...
January 5, 2018: 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
#18
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
#19
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
#20
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
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