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https://www.readbyqxmd.com/read/28102959/x-ray-scatter-correction-for-multi-source-interior-computed-tomography
#1
Hao Gong, Hao Yan, Xun Jia, Bin Li, Ge Wang, Guohua Cao
PURPOSE: The schemes of multi-source interior computed tomography (CT) have shown promise for ultra-fast, organ-oriented, and low-dose dynamic imaging. Besides forward scattering, x-ray cross scattering from multiple x-ray sources activated simultaneously can further degrade image quality. Here, we investigate the overall x-ray scattering artifact in a recently proposed multi-source interior CT architecture, and present two methods for scatter correction. METHODS: Compared to single-source global CT, scattering in multi-source interior CT architecture is affected by two new factors: cross scattering from simultaneously activated multiple x-ray sources and region-of-interest (ROI) oriented interior CT mode...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102958/sliding-window-prior-data-assisted-compressed-sensing-for-mri-tracking-of-lung-tumors
#2
Eugene Yip, Jihyun Yun, Keith Wachowicz, Zsolt Gabos, Satyapal Rathee, B G Fallone
PURPOSE: Hybrid magnetic resonance imaging and radiation therapy devices are capable of imaging in real-time to track intrafractional lung tumor motion during radiotherapy. Highly accelerated magnetic resonance (MR) imaging methods can potentially reduce system delay time and/or improves imaging spatial resolution, and provide flexibility in imaging parameters. Prior Data Assisted Compressed Sensing (PDACS) has previously been proposed as an acceleration method that combines the advantages of 2D compressed sensing and the KEYHOLE view-sharing technique...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102956/experimental-verification-of-4d-monte-carlo-simulations-of-dose-delivery-to-a-moving-anatomy
#3
Sara Gholampourkashi, Miro Vujicic, Jason Belec, Joanna E Cygler, Emily Heath
PURPOSE: To evaluate a novel 4D Monte Carlo simulation tool by comparing calculations to physical measurements using a respiratory motion phantom. METHODS: We used a dynamic Quasar phantom in both stationary and breathing states (sinusoidal motion of amplitude of 1.8 cm and period of 3.3 s) for dose measurements on an Elekta Agility linear accelerator. Gafchromic EBT3 film and the RADPOS 4D dosimetry system were placed inside the lung insert of the phantom to measure dose profiles and point-dose values at the center of the spherical tumor inside the insert...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102955/compound-speckle-model-detects-anti-angiogenic-tumor-response-in-preclinical-nonlinear-contrast-enhanced-ultrasonography
#4
Matthew R Lowerison, Justin J Tse, M Nicole Hague, Ann F Chambers, David W Holdsworth, James C Lacefield
PURPOSE: This paper proposes a method for analyzing the first-order speckle statistics of nonlinear contrast-enhanced ultrasound images from tumors. METHODS: Contrast signal intensity is modeled as a compound distribution of exponential probability density functions with a gamma weighting function. The gamma probability weighting function serves as an approximation for log-normally distributed flow velocities in a vascular network. The model was applied to sub-harmonic bolus-injection images acquired from a mouse breast cancer xenograft model treated with murine version bevacizumab...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102953/air-kerma-strength-determination-of-an-hdr-192-ir-source-including-a-geometric-sensitivity-study-of-the-seven-distance-method
#5
Blake R Smith, John A Micka, Manik Aima, Larry A DeWerd, Wesley S Culberson
PURPOSE: To perform an in-air air-kerma strength (SK) calibration of the Bebig model Ir2.A85-2 192Ir high-dose rate (HDR) brachytherapy source manufactured by Mallinckrodt Medical (Westerduinweg, Germany) with the NIST-traceable seven-distance technique established by the University of Wisconsin. A comparison was made between the reference air-kerma rate (RAKR) reported on a certificate from the Physikalisch-Technische Bundesanstalt (Berlin, Germany) (PTB) primary laboratory and the SK determined at the University of Wisconsin Madison Radiation Research Center (UWMRRC)...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102944/a-simple-and-robust-trajectory-based-stereotactic-radiosurgery-treatment
#6
Byron Wilson, Karl Otto, Ermias Gete
INTRODUCTION: We present a Trajectory-based Volumetric Modulated Arc Therapy (TVMAT) technique for Stereotactic Radiosurgery (SRS) that takes advantage of a modern linacs ability to modulate dose rate and move the couch dynamically. In addition, we investigate the quality of the developed TVMAT method and the dosimetric accuracy of the technique. METHODS: The main feature of the TVMAT technique is a standard beam trajectory formed by dynamic motion of the treatment couch and the linac gantry...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102940/effect-of-cast-modification-on-denture-base-adaptation-following-maxillary-complete-denture-processing
#7
Mohammed E Sayed, Amit Porwal, David Ehrenberg, Saul Weiner
PURPOSE: To investigate the effect of cast modifications on denture base adaptation in coronal and sagittal projections following maxillary complete denture processing. MATERIALS AND METHODS: A total of 60 edentulous maxillary casts (n = 10) were distributed among six groups. Group 1 was the control group with no modification, groups 2 through 6 included a butterfly postdam preparation, groups 3 and 4 also included a 10-mm wide/4-mm deep box with addition of four round holes in group 4, and groups 5 and 6 also included a 20-mm wide/4-mm deep box with addition of four round holes in group 6...
January 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28102935/ectopic-cushing-syndrome-in-small-cell-lung-cancer-a-case-report-and-literature-review
#8
Hang-Yu Zhang, Jun Zhao
Small cell lung cancer (SCLC) is a neuroendocrine tumor with the potential to secrete various peptides or hormones that can lead to paraneoplastic syndromes, such as Ectopic Cushing syndrome (ECS). Because of the aggressive nature of the syndrome and its atypical features, ECS in small-cell lung cancer is difficult to diagnose and has a poor prognosis. We report a case of a 74-year-old male patient who presented with severe hypokalemia, proximal muscle weakness, peripheral edema, metabolic alkalosis, and worsening hyperglycemia...
November 8, 2016: Thoracic Cancer
https://www.readbyqxmd.com/read/28102926/sodiation-based-in-source-collision-for-profiling-of-pyranocoumarins-in-radix-peucedani-qianhu-utility-of-sodium-adducts-stability-with-in-source-collision
#9
Wei Yang, Yingfei Li, Chen Kang, Haiyu Zhao, Li Xiang, Chuan Li, Qiao Wang
Full scan mode of liquid chromatography-mass spectrometry equipped with an electrospray ionization source offers a chance on global detection of complicated components; however, the scan mode carries significant challenges in rapidly capturing information of analysts. Sodiation-based in-source collision was proposed here, as a technique for rapid detecting untargeted analytes in full scan analysis, which was based on the stability of sodium adducts and the nonselectivity of in-source collision. Then the technique was applied to profile of angular-type pyranocoumarins (APs) in Radix Peucedani, with full scan analysis performed at two specific in-source collision energy: a high energy 50 V that is tolerated by the sodium adducts of APs, and a low energy 10 V, at which abundant adducts were offered...
January 19, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28102922/effect-of-the-unfilled-space-size-of-the-abutment-screw-access-hole-on-the-extruded-excess-cement-and-retention-of-single-implant-zirconia-crowns
#10
Sulieman S Al-Johany, Mohammad D Al Amri, Ahmed S Al-Bakri, Mohammed N Al-Qarni
PURPOSE: To evaluate in vitro the effect of the size of the unfilled space of the abutment screw access hole on the amount of extruded excess cement and the retention of zirconia copings. MATERIALS AND METHODS: Twelve dental implant replicas were attached to the corresponding abutments and embedded in acrylic resin blocks. A total of 36 CAD/CAM zirconia copings were fabricated by one technician using the standard technique. Abutments were divided into group I: the entire screw access channel was completely filled (nonspaced); group II: 1-mm-spaced; and group III: 2-mm-spaced...
January 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28102901/risk-of-arrhythmic-death-in-ischemic-heart-disease-a-prospective-controlled-observer-blind-investigation-over-10-years
#11
Thomas Pezawas, André Diedrich, David Robertson, Robert Winker, Bernhard Richter, Li Wang, Herwig Schmidinger
BACKGROUND: Risk of arrhythmic death is considered highest in ischemic heart disease with severe left ventricular ejection fraction (LVEF) reduction. Non-invasive testing should improve decision-making of prophylactic defibrillator (ICD) implantation. METHODS AND RESULTS: We enrolled 120 patients with ischemic heart disease and LVEF <50% and 30 control subjects without ischemic heart disease and normal LVEF. An initial assessment, a second assessment after 3 years, and a final follow-up comprised of: pharmacological baroreflex testing (BRS), short-term spectral (low frequency (LF) to high frequency (HF) ratio) and long-term time domain analysis of heart rate variability (SDNN), exercise Microvolt T-wave alternans (MTWA) and others...
January 19, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28102695/application-of-modified-atmosphere-packaging-on-aquacultured-fish-and-fish-products-a-review
#12
Achilleas D Bouletis, Ioannis S Arvanitoyannis, Christos Hadjichristodoulou
Aquaculture industry has undergone a rapid and continuous growth during the last decade due to increased demands in seafood consumption and reduced pelagic fish production. Aquaculture sector can provide products with a consistent flow and quality standards to cover the market's needs. Modified atmosphere packaging (MAP) technique has evolved over the last two decades and many reports indicate its beneficial effect on many quality parameters during fish and shellfish preservation. The use of MAP can clearly offer an advantage to the safer distribution of quality aqua cultured fishery products...
January 19, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28102678/a-self-assembled-cofacial-cobalt-porphyrin-prism-for-oxygen-reduction-catalysis
#13
Amanda N Oldacre, Alan E Friedman, Timothy R Cook
Herein we report the first study of the oxygen reduction reaction (ORR) catalyzed by a cofacial porphyrin scaffold accessed in high yield (overall 53%) using coordination-driven self-assembly with no chromatographic purification steps. The ORR activity was investigated using chemical and electrochemical techniques on monomeric cobalt(II) tetra(meso-4-pyridyl)porphyrinate (CoTPyP) and its cofacial analogue [Ru8(η(6)-iPrC6H4Me)8(dhbq)4(CoTPyP)2][OTf]8 (Co Prism) (dhbq = 2,5-dihydroxy-1,4-benzoquinato, OTf = triflate) as homogeneous oxygen reduction catalysts...
January 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28102658/implantation-of-the-sorin-perceval%C3%A2-sutureless-aortic-valve-a-step-by-step-approach
#14
Steffen Pfeiffer, Joachim Sirch, Ferdinand Vogt, Theodor Fischlein, Giuseppe Santarpino
Since the introduction of the sutureless Perceval® (Sorin Group, Saluggia, Italy) in Europe after CE mark in 2012, the "sutureless approach" is becoming more and more popular. Sutureless implantation in general is easy, fast and safe, but bears several potential pitfalls. This might result in inferior functional results affecting also clinical outcomes. In our center, more than 300 implant procedures have been performed up to date by mainly two senior surgeons. The technique is in the process of spreading to all surgeons performing aortic valve procedures...
April 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/28102576/printable-functional-chips-based-on-nanoparticle-assembly
#15
REVIEW
Yu Huang, Wenbo Li, Meng Qin, Haihua Zhou, Xingye Zhang, Fengyu Li, Yanlin Song
With facile manufacturability and modifiability, impressive nanoparticles (NPs) assembly applications were performed for functional patterned devices, which have attracted booming research attention due to their increasing applications in high-performance optical/electrical devices for sensing, electronics, displays, and catalysis. By virtue of easy and direct fabrication to desired patterns, high throughput, and low cost, NPs assembly printing is one of the most promising candidates for the manufacturing of functional micro-chips...
January 2017: Small
https://www.readbyqxmd.com/read/28102571/developing-a-cultural-competence-inventory-for-nurses-in-china
#16
D Cai, W Kunaviktikul, A Klunklin, A Sripusanapan, P K Avant
AIM: To develop and psychometrically test the Cultural Competence Inventory for Nurses in China. BACKGROUND: Cultural competence is expected worldwide from nurses due to the increasing cultural diversity of people in healthcare establishments. Yet, no cultural competence framework or instrument for nurses has been identified to guide nursing practice in China where the cultural diversity of the populations and the characteristics of the healthcare system are different from those of the West...
January 19, 2017: International Nursing Review
https://www.readbyqxmd.com/read/28102539/determination-of-the-median-effective-dose-ed50-of-spinal-chloroprocaine-in-labour-analgesia
#17
M Coppens, S Anssens, A Parashchanka, K Roelens, E Deschepper, S De Hert, P F Wouters
The primary goal of this study was to determine the median effective dose (ED50 ) of spinal chloroprocaine for labour analgesia. Thirty-eight parturients requesting neuraxial analgesia were enrolled. Doses of 1% chloroprocaine were determined by the technique of up-down sequential allocation, with an initial dose of 20 mg and steps of 2 mg. The chloroprocaine spinal dose was given as the spinal component of a combined spinal-epidural, which was then supplemented with an epidural dose of 7.5 μg sufentanil in 7 ml saline...
January 19, 2017: Anaesthesia
https://www.readbyqxmd.com/read/28102534/evacuation-performance-evaluation-tool
#18
Sharon Farra, Elaine T Miller, Matthew Gneuhs, Nathan Timm, Gengxin Li, Ashley Simon, Whittney Brady
OBJECTIVE: Hospitals conduct evacuation exercises to improve performance during emergency events. An essential aspect in this process is the creation of reliable and valid evaluation tools. The objective of this article is to describe the development and implications of a disaster evacuation performance tool that measures one portion of the very complex process of evacuation. DESIGN: Through the application of the Delphi technique and DeVellis's framework, disaster and neonatal experts provided input in developing this performance evaluation tool...
April 2016: American Journal of Disaster Medicine
https://www.readbyqxmd.com/read/28102532/time-to-epinephrine-in-out-of-hospital-cardiac-arrest-a-retrospective-analysis-of-intraosseous-versus-intravenous-access
#19
Elliot M Ross, Julian Mapp, Chetan Kharod, David A Wampler, Christopher Velasquez, David A Miramontes
INTRODUCTION: The 2015 advanced cardiac life support update continues to advocate administering epinephrine during cardiac arrest. The goal of our study is to determine if prehospital intraosseous (IO) access results in shorter time to epinephrine than prehospital peripheral intravenous (PIV) access. METHODS: The out-of-hospital cardiac arrest (OHCA) database of a large, urban, fire-based emergency medical services system was searched for consecutive cases of OHCA between January 2013 and December 2015...
April 2016: American Journal of Disaster Medicine
https://www.readbyqxmd.com/read/28102524/heat-transfer-capability-of-ethylene-glycol-water-based-nanofluids-containing-graphene-nanoplatelets-design-and-thermophysical-profile
#20
D Cabaleiro, L Colla, S Barison, L Lugo, L Fedele, S Bobbo
This research aims at studying the stability and thermophysical properties of nanofluids designed as dispersions of sulfonic acid-functionalized graphene nanoplatelets in an (ethylene glycol + water) mixture at (10:90)% mass ratio. Nanofluid preparation conditions were defined through a stability analysis based on zeta potential and dynamic light scattering (DLS) measurements. Thermal conductivity, dynamic viscosity, and density were experimentally measured in the temperature range from 283.15 to 343.15 K and nanoparticle mass concentrations of up to 0...
December 2017: Nanoscale Research Letters
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