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https://www.readbyqxmd.com/read/29161293/high-intensity-focused-ultrasound-ablation-around-the-tubing
#1
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/29159885/two-stage-ionoacoustic-range-verification-leveraging-monte-carlo-and-acoustic-simulations-to-stably-account-for-tissue-inhomogeneity-and-accelerator-specific-time-structure-a-simulation-study
#2
Sarah K Patch, Daniel E M Hoff, Tyler B Webb, Lee G Sobotka, Tianyu Zhao
PURPOSE: Range errors constrain treatment planning by limiting choice of ion beam angles and requiring large margins. Ionoacoustic range verification requires recovering the location of an acoustic source from low frequency signals. A priori information is applied to stably overcome resolution limits of inverse acoustic source imaging in this simulation study. In particular, the accuracy and robustness of ionoacoustic range verification for lateral and oblique delivery of high-energy protons to the prostate is examined...
November 20, 2017: Medical Physics
https://www.readbyqxmd.com/read/29157463/enhanced-wiener-filter-for-ultrasound-image-restoration
#3
Fabio Baselice, Giampaolo Ferraioli, Michele Ambrosanio, Vito Pascazio, Gilda Schirinzi
BACKGROUND AND OBJECTIVE: Speckle phenomenon strongly affects UltraSound (US) images. In the last years, several efforts have been done in order to provide an effective denoising methodology. Although good results have been achieved in terms of noise reduction effectiveness, most of the proposed approaches are not characterized by low computational burden and require the supervision of an external operator for tuning the input parameters. METHODS: Within this manuscript, a novel approach is investigated, based on Wiener filter...
January 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29155383/efficacy-of-optical-coherence-tomography-derived-morphometric-assessment-in-predicting-the-physiological-significance-of-coronary-stenosis-head-to-head-comparison-with-intravascular-ultrasound
#4
Eisuke Usui, Taishi Yonetsu, Yoshihisa Kanaji, Masahiro Hoshino, Masao Yamaguchi, Masahiro Hada, Rikuta Hamaya, Yoshinori Kanno, Tadashi Murai, Tetsumin Lee, Tsunekazu Kakuta
AIMS: This study aimed to investigate the diagnostic efficacy of optical coherence tomography (OCT) in identifying functional significance via fractional flow reserve (FFR) compared with that of intravascular ultrasound (IVUS). METHODS AND RESULTS: We investigated 203 de novo intermediate coronary lesions of 186 patients who underwent frequency-domain OCT, IVUS and FFR measurements. Diagnostic efficacy of the minimal lumen area (MLA) obtained by OCT (OCT-MLA) and IVUS (IVUS-MLA) in predicting an FFR<0...
November 21, 2017: EuroIntervention
https://www.readbyqxmd.com/read/29148091/intrinsic-subtypes-of-breast-cancers-initially-assessed-as-probably-benign-or-of-low-suspicion-on-ultrasonography-differ-according-to-tumor-size
#5
Jieun Koh, Min Jung Kim, Hee Jung Moon, Jung Hyun Yoon, Vivian Youngjean Park, Eun-Kyung Kim
OBJECTIVES: To investigate whether the intrinsic subtypes of breast cancers initially assessed as American College of Radiology Breast Imaging and Reporting System (BI-RADS) category 3 or 4a differ according to tumor size. METHODS: A total of 444 breast cancers in 439 patients initially assessed as BI-RADS 3 or 4a through ultrasound-guided core needle biopsy were included. Tumors were classified by the size criterion of 10 mm or smaller or larger than 10 mm and categorized as the luminal type (estrogen receptor [ER] positive and/or progesterone receptor [PR] positive and human epidermal growth factor receptor 2 [HER2] negative), HER2 type (HER2 positive regardless of ER or PR status), or triple-negative type (ER negative, PR negative, and HER2 negative)...
November 17, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29148000/the-feasibility-and-safety-of-piccs-accessed-via-the-superficial-femoral-vein-in-patients-with-superior-vena-cava-syndrome
#6
Yonghui Wan, Yuxin Chu, Yanru Qiu, Qian Chen, Wei Zhou, Qibin Song
OBJECTIVE: To investigate the feasibility and safety of the peripherally inserted central catheters (PICCs) accessed via the superficial femoral vein in patients with superior vena cava syndrome (SVCS). METHODS: From October 2010 to December 2014, 221 cancer patients with SVCS in our center received real-time ultrasound-guidance of the superficial femoral vein inserted central catheters (FICCs) at the mid-thigh. PICC insertion via upper extremity veins had also been investigated in 2604 cancer patients without SVCS as control...
November 10, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/29137768/low-frequency-ultrasonic-assisted-hydrolysis-of-starch-in-the-presence-of-%C3%AE-amylase
#7
Anne Gaquere-Parker, Tamera Taylor, Raihannah Hutson, Ashley Rizzo, Aubrey Folds, Shastina Crittenden, Neelam Zahoor, Bilal Hussein, Aaron Arruda
Hydrolysis of starch is an important process in the food industry and in the production of bioethanol or smaller carbohydrate molecules that can be used as starting blocks for chemical synthesis. Such hydrolysis can be enhanced by lowering the pH, heating the reaction mixture or catalyzing the reaction with enzymes. This study reports the effect of sonication on the reaction rate of starch hydrolysis at different temperatures, in the presence or absence of alpha-amylase. Starch Azure, a commercially available potato starch covalently linked with Remazol Brilliant Blue, has been chosen since its hydrolysis releases a blue dye, which concentration can be monitored by UV Vis spectroscopy...
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/29132387/theoretically-proposed-optimal-frequency-for-ultrasound-induced-cartilage-restoration
#10
April D Miller, Anuradha Subramanian, Hendrik J Viljoen
BACKGROUND: Matching the frequency of the driving force to that of the system's natural frequency of vibration results in greater amplitude response. Thus we hypothesize that applying ultrasound at the chondrocyte's resonant frequency will result in greater deformation than applying similar ultrasound power at a frequency outside of the resonant bandwidth. Based on this resonant hypothesis, our group previously confirmed theoretically and experimentally that ultrasound stimulation of suspended chondrocytes at resonance (5 MHz) maximized gene expression of load inducible genes...
November 14, 2017: Theoretical Biology & Medical Modelling
https://www.readbyqxmd.com/read/29127239/a-novel-method-for-quantitative-myocardial-contrast-echocardiography-in-mice
#11
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
#12
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/29124063/a-review-of-the-combination-therapy-of-low-frequency-ultrasound-with-antibiotics
#13
REVIEW
Yun Cai, Jin Wang, Xu Liu, Rui Wang, Lei Xia
Single antimicrobial therapy has been unable to resist the global spread of bacterial resistance. Literatures of available in vitro and in vivo studies were reviewed and the results showed that low frequency ultrasound (LFU) has a promising synergistic bactericidal effect with antibiotics against both planktonic and biofilm bacteria. It also can facilitate the release of antibiotics from medical implants. As a noninvasive and targeted therapy, LFU has great potential in treating bacterial infections. However, more in-depth and detailed studies are still needed before LFU is officially applied as a combination therapy in the field of anti-infective treatment...
2017: BioMed Research International
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
#14
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/29108135/regimens-of-ultrasound-surveillance-for-twin-pregnancies-for-improving-outcomes
#15
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/29098740/does-non-contact-low-frequency-ultrasound-nlfu-therapy-contribute-to-wound-healing-at-the-molecular-level
#16
Cornelia Wiegand, Kyle Bittenger, Robert D Galiano, Vickie R Driver, Gary W Gibbons
Non-contact low frequency ultrasound (NLFU) is used to treat various types of chronic wounds including venous, diabetic and pressure ulcers. The objective for this sub study of the IN BALANCE RCT VLU trial was to characterize and compare the NLFU treatment group and patients receiving standard of care (SOC) with respect to the effect of the assigned study treatment on content/quantity of inflammatory cytokines and fibrinogen as well as bacteria. Higher mean wound area reduction was observed in the NLFU treatment group (67...
November 2, 2017: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/29097866/how-to-perform-gastrointestinal-ultrasound-anatomy-and-normal-findings
#17
REVIEW
Nathan S S Atkinson, Robert V Bryant, Yi Dong, Christian Maaser, Torsten Kucharzik, Giovanni Maconi, Anil K Asthana, Michael Blaivas, Adrian Goudie, Odd Helge Gilja, Dieter Nuernberg, Dagmar Schreiber-Dietrich, Christoph F Dietrich
Gastrointestinal ultrasound is a practical, safe, cheap and reproducible diagnostic tool in inflammatory bowel disease gaining global prominence amongst clinicians. Understanding the embryological processes of the intestinal tract assists in the interpretation of abnormal sonographic findings. In general terms, the examination principally comprises interrogation of the colon, mesentery and small intestine using both low-frequency and high-frequency probes. Interpretation of findings on GIUS includes assessment of bowel wall thickness, symmetry of this thickness, evidence of transmural changes, assessment of vascularity using Doppler imaging and assessment of other specific features including lymph nodes, mesentery and luminal motility...
October 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29091044/dispersion-risk-associated-with-surgical-debridement-devices
#18
Mark Granick, Liel Rubinsky, Chaitra Parthiban, Mayilvahanan Shanmugam, Narayanan Ramasubbu
INTRODUCTION: Surgical instrumentation is now available to facilitate wound debridement. The 2 primary options involve different energy applications, but both have the potential to spray. The Versajet II (Smith & Nephew, London, UK) utilizes a high-powered water jet to disrupt tissue and remove debris by means of the Venturi effect. The SonicVac (Misonix, Farmingdale, NY) is a direct-contact, low-frequency ultrasound debriding device. It delivers a high-energy ultrasound to a wound surface via a fluid medium, causing bubble cavitation, a physical effect of rapid pressure waves causing bubbles to form and implode that releases mechanical energy...
October 2017: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/29079395/effect-of-low-intensity-pulsed-ultrasound-on-the-expression-of-calcium-ion-transport-related-proteins-during-tertiary-dentin-formation
#19
Jing Zuo, Jiaxiu Zhen, Fei Wang, Yueheng Li, Zhi Zhou
Low-intensity pulsed ultrasound (LIPUS) is known for its positive effect on bone healing and reparative regeneration. This study investigated whether LIPUS affects reparative progression of the tooth and the expression of calcium ion transport-related proteins in odontoblasts and dental pulp cells using a rat dentin-pulp complex injury model. Forty male adult Sprague-Dawley rats underwent cavity preparation in the right maxillary first molar: 20 received LIPUS irradiation on the cavity-prepared tooth; 20 received LIPUS irradiation on the left maxillary first molar...
October 24, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29075519/evaluation-of-musculoskeletal-symptoms-among-physicians-performing-ultrasound
#20
Paweł Wareluk, Wiesław Jakubowski
AIM OF THE STUDY: Owing to its wide availability, relatively low cost and lack of negative effect on the patient, ultrasound has become the most commonly and readily used imaging modality. However, scanning for increasingly long periods of time on a given day and in a given week tends to negatively affect sonographers' health, primarily resulting with the overuse of the musculoskeletal system, as multiple muscles and joints are engaged during scanning. This research has been aimed at evaluating the prevalence and type of musculoskeletal symptoms among diagnostic medical sonographers, as well as identifying their professional profile...
September 2017: Journal of Ultrasonography
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