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https://www.readbyqxmd.com/read/28297309/production-review-and-impact-of-technical-quality-control-guidelines-in-a-national-context
#1
Michelle K Nielsen, Kyle E Malkoske, Erika Brown, Kevin Diamond, Normand Frenière, John Grant, Natalie Pomerleau-Dalcourt, Jason Schella, L John Schreiner, Laurent Tantôt, J Eduardo Villarreal-Barajas, Jean-Pierre Bissonnette
A close partnership between the Canadian Partnership for Quality Radiotherapy (CPQR) and the Canadian Organization of Medical Physicist's (COMP) Quality Assurance and Radiation Safety Advisory Committee (QARSAC) has resulted in the development of a suite of Technical Quality Control (TQC) guidelines for radiation treatment equipment; they outline specific performance objectives and criteria that equipment should meet in order to assure an acceptable level of radiation treatment quality. The adopted framework for the development and maintenance of the TQCs ensures the guidelines incorporate input from the medical physics community during development, measures the workload required to perform the QC tests outlined in each TQC, and remain relevant (i...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28294368/estimating-cross-validatory-predictive-p-values-with-integrated-importance-sampling-for-disease-mapping-models
#2
Longhai Li, Cindy X Feng, Shi Qiu
An important statistical task in disease mapping problems is to identify divergent regions with unusually high or low risk of disease. Leave-one-out cross-validatory (LOOCV) model assessment is the gold standard for estimating predictive p-values that can flag such divergent regions. However, actual LOOCV is time-consuming because one needs to rerun a Markov chain Monte Carlo analysis for each posterior distribution in which an observation is held out as a test case. This paper introduces a new method, called integrated importance sampling (iIS), for estimating LOOCV predictive p-values with only Markov chain samples drawn from the posterior based on a full data set...
March 12, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28277803/a-systematic-review-of-the-evidence-for-acute-tolerance-to-alcohol-the-mellanby-effect
#3
Michael G Holland, Robin E Ferner
OBJECTIVE: To review the evidence for "the Mellanby effect", that is, whether the response to a given blood alcohol concentration (BAC) is more marked when BAC is rising than at the same concentration when BAC is falling. METHODS: We systematically searched the databases EMBASE, Medline, and Scopus up to and including December 2016 using text words "tolerance", "ascending", "descending" or "Mellanby" with Medline term "exp *alcohol/" or "exp *drinking behavior/" or equivalent...
March 9, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28265240/optimal-planning-strategy-among-various-arc-arrangements-for-prostate-stereotactic-body-radiotherapy-with-volumetric-modulated-arc-therapy-technique
#4
Sang Won Kang, Jin Beom Chung, Jae Sung Kim, In Ah Kim, Keun Yong Eom, Changhoon Song, Jeong Woo Lee, Jin Young Kim, Tae Suk Suh
BACKGROUND: The aim of this study was to determine the optimal strategy among various arc arrangements in prostate plans of stereotactic body radiotherapy with volumetric modulated arc therapy (SBRT-VMAT). PATIENTS AND METHODS: To investigate how arc arrangements affect dosimetric and biological metrics, SBRT-VMAT plans for eighteen patients were generated with arrangements of single-full arc (1FA), single-partial arc (1PA), double-full arc (2FA), and double-partial arc (2PA)...
March 1, 2017: Radiology and Oncology
https://www.readbyqxmd.com/read/28249938/remifentanil-for-procedural-sedation-a-systematic-review-of-the-literature
#5
Magdalena Kisilewicz, Hans Rosenberg, Christian Vaillancourt
OBJECTIVE: We sought to determine the performance characteristics of remifentanil as an agent of procedural sedation and analgesia (PSA) for adult and paediatric patients undergoing procedures similar to those executed in the ED. METHODS: We systematically reviewed electronically published literature, grey literature, conference proceedings and trial registries from 1946 to 2015. Outcome measures included PSA effectiveness, recovery time, patient safety and resource management...
March 1, 2017: Emergency Medicine Journal: EMJ
https://www.readbyqxmd.com/read/28236553/does-maximal-external-tibial-component-rotation-influence-tibiofemoral-load-distribution-in-the-primary-knee-arthroplasty-setting-a-comparison-of-neutral-vs-maximal-anatomical-external-rotatory-states
#6
William A Manning, Kanishka M Ghosh, Alasdair P Blain, Lee M Longstaff, Steven P Rushton, David J Deehan
BACKGROUND: Tibial component rotation at time of knee arthroplasty can influence conformity, load transmission across the polyethylene surface, and perhaps ultimately determined survivorship. Optimal tibial component rotation on the cut surface is reliant on standard per operative manual stressing. This subjective assessment aims to balance constraint and stability of the articulation through a full arc of movement. METHODS: Using a cadaveric model, computer navigation and under defined, previously validated loaded conditions mimicking the in vivo setting, the influence of maximal tibial component external rotation compared with the neutral state was examined for changes in laxity and tibiofemoral continuous load using 3D displacement measurement and an orthosensor continuous load sensor implanted within the polyethylene spacer in a simulated single radius total knee arthroplasty...
February 1, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28226407/relationship-between-functional-and-structural-retinal-changes-in-myopic-eyes
#7
Zafer Fahiem Ismael, Amany Abd El-Fattah El-Shazly, Yousra Ahmed Farweez, Marwa Mahmoud Mohammed Osman
BACKGROUND: The aim of this study was to investigate the retinal structure in different grades of myopia and correlate it with the functional changes detected with multifocal electroretinogram (mf-ERG) and try to show the most important determining factors. METHODS: The study included 80 participants divided into four groups according to their spherical equivalent refractive error, namely, emmetropia (within ± 0.50 D), mild myopia group (greater than -0.50 to -3...
February 22, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28212098/a-2-5-mw-ch-50-mcps-10-analog-channel-adaptively-biased-read-out-front-end-ic-with-low-intrinsic-timing-resolution-for-single-photon-time-of-flight-pet-applications-with-time-dependent-noise-analysis-in-90-nm-cmos
#8
Hugo Cruz, Hong-Yi Huang, Ching-Hsing Luo, Shuenn-Yuh Lee
This paper presents a 10-channel time-of-flight application-specific integrated circuit (ASIC) for positron emission tomography in a 90 nm standard CMOS process. To overcome variations in channel-to-channel timing resolution caused by mismatch and process variations, adaptive biases and a digital-to-analog converter (DAC) are utilized. The main contributions of this work are as follows. First, multistage architectures reduce the total power consumption, and detection bandwidths of analog preamplifiers and comparators are increased to 1 and 1...
February 13, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28202072/a-pilot-randomised-controlled-trial-evaluating-mini-and-conventional-implant-retained-dentures-on-the-function-and-quality-of-life-of-patients-with-an-edentulous-mandible
#9
Sarra Jawad, Craig Barclay, William Whittaker, Martin Tickle, Tanya Walsh
BACKGROUND: Total tooth loss (edentulism) can be a debilitating condition, impacting on ability to chew, speak and interact with others. The most common treatment is with complete removable dentures, which may be successful, but in the lower jaw, bone resorption that worsens over time makes denture-wearing difficult. Two dental implants in the mandible to retain the lower denture has been advocated as the gold standard of treatment, but has not been universally provided due largely to financial constraints and also patient fear...
February 15, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28185657/physical-activity-and-sedentary-behavior-in-breast-and-colon-cancer-survivors-relative-to-adults-without-cancer
#10
Joyce W Shi, Robert J MacInnis, Terry Boyle, Jeff K Vallance, Elisabeth A H Winkler, Brigid M Lynch
OBJECTIVE: To assess differences in accelerometer-assessed moderate- to vigorous-intensity physical activity (MVPA), light-intensity physical activity, and sedentary time between cancer survivors and adults without cancer. PATIENTS AND METHODS: Accelerometer data collected from 241 breast cancer survivors (ACCEL-Breast study, 2013) and 171 colon cancer survivors (ACCEL-Colon study, 2012-2013) were pooled with data collected from adults without cancer (Australian Diabetes, Obesity and Lifestyle accelerometer substudy, 2011-2012)...
March 2017: Mayo Clinic Proceedings
https://www.readbyqxmd.com/read/28165408/response-surface-methodology-optimization-of-ultrasonic-assisted-extraction-of-acer-truncatum-leaves-for-maximal-phenolic-yield-and-antioxidant-activity
#11
Lingguang Yang, Peipei Yin, Hang Fan, Qiang Xue, Ke Li, Xiang Li, Liwei Sun, Yujun Liu
This study is the first to report the use of response surface methodology to improve phenolic yield and antioxidant activity of Acer truncatum leaves extracts (ATLs) obtained by ultrasonic-assisted extraction. The phenolic composition in ATLs extracted under the optimized conditions were characterized by UPLC-QTOF-MS/MS. Solvent and extraction time were selected based on preliminary experiments, and a four-factors-three-levels central composite design was conducted to optimize solvent concentration (X₁), material-to-liquid ratio (X₂), ultrasonic temperature (X₃) and power (X₄) for an optimal total phenol yield (Y₁) and DPPH• antioxidant activity (Y₂)...
February 4, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28135027/long-term-no-till-and-stover-retention-each-decrease-the-global-warming-potential-of-irrigated-continuous-corn
#12
Virginia L Jin, Marty R Schmer, Catherine E Stewart, Aaron J Sindelar, Gary E Varvel, Brian J Wienhold
Over the last 50 years, the most increase in cultivated land area globally has been due to a doubling of irrigated land. Long-term agronomic management impacts on soil organic carbon (SOC) stocks, soil greenhouse gas (GHG) emissions, and global warming potential (GWP) in irrigated systems, however, remain relatively unknown. Here, residue and tillage management effects were quantified by measuring soil nitrous oxide (N2 O) and methane (CH4 ) fluxes and SOC changes (ΔSOC) at a long-term, irrigated continuous corn (Zea mays L...
January 30, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28128838/combining-cell-based-hydrodynamics-with-hybrid-particle-field-simulations-efficient-and-realistic-simulation-of-structuring-dynamics
#13
G J A Sevink, F Schmid, T Kawakatsu, G Milano
We have extended an existing hybrid MD-SCF simulation technique that employs a coarsening step to enhance the computational efficiency of evaluating non-bonded particle interactions. This technique is conceptually equivalent to the single chain in mean-field (SCMF) method in polymer physics, in the sense that non-bonded interactions are derived from the non-ideal chemical potential in self-consistent field (SCF) theory, after a particle-to-field projection. In contrast to SCMF, however, MD-SCF evolves particle coordinates by the usual Newton's equation of motion...
January 27, 2017: Soft Matter
https://www.readbyqxmd.com/read/28127772/the-association-of-electronic-health-record-adoption-with-staffing-mix-in-community-health-centers
#14
Bianca K Frogner, Xiaoli Wu, Jeongyoung Park, Patricia Pittman
OBJECTIVE: To assess how medical staffing mix changed over time in association with the adoption of electronic health records (EHRs) in community health centers (CHCs). STUDY SETTING: Community health centers within the 50 states and Washington, DC. STUDY DESIGN: Estimated how the change in the share of total medical staff full-time equivalents (FTE) by provider category between 2007 and 2013 was associated with EHR adoption using fractional multinomial logit...
February 2017: Health Services Research
https://www.readbyqxmd.com/read/28121261/occupational-injuries-and-exposures-among-emergency-medical-services-workers
#15
Audrey A Reichard, Suzanne M Marsh, Theresa R Tonozzi, Srinivas Konda, Mirinda A Gormley
OBJECTIVE: Emergency medical services (EMS) workers incur occupational injuries at a higher rate than the general worker population. This study describes the circumstances of occupational injuries and exposures among EMS workers to guide injury prevention efforts. METHODS: The National Institute for Occupational Safety and Health collaborated with the National Highway Traffic Safety Administration to conduct a follow-back survey of injured EMS workers identified from a national sample of hospital emergency departments (EDs) from July 2010 through June 2014...
January 25, 2017: Prehospital Emergency Care
https://www.readbyqxmd.com/read/28117712/efficient-wideband-spectrum-sensing-with-maximal-spectral-efficiency-for-leo-mobile-satellite-systems
#16
Feilong Li, Zhiqiang Li, Guangxia Li, Feihong Dong, Wei Zhang
The usable satellite spectrum is becoming scarce due to static spectrum allocation policies. Cognitive radio approaches have already demonstrated their potential towards spectral efficiency for providing more spectrum access opportunities to secondary user (SU) with sufficient protection to licensed primary user (PU). Hence, recent scientific literature has been focused on the tradeoff between spectrum reuse and PU protection within narrowband spectrum sensing (SS) in terrestrial wireless sensing networks. However, those narrowband SS techniques investigated in the context of terrestrial CR may not be applicable for detecting wideband satellite signals...
January 21, 2017: Sensors
https://www.readbyqxmd.com/read/28116031/exploring-scholarship-and-the-emergency-medicine-educator-a-workforce-study
#17
Jaime Jordan, Wendy C Coates, Samuel Clarke, Daniel P Runde, Emilie Fowlkes, Jacqueline Kurth, Lalena M Yarris
INTRODUCTION: Recent literature calls for initiatives to improve the quality of education studies and support faculty in approaching educational problems in a scholarly manner. Understanding the emergency medicine (EM) educator workforce is a crucial precursor to developing policies to support educators and promote education scholarship in EM. This study aims to illuminate the current workforce model for the academic EM educator. METHODS: Program leadership at EM training programs completed an online survey consisting of multiple choice, completion, and free-response type items...
January 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28113707/ula-op-256-a-256-channel-open-scanner-for-development-and-real-time-implementation-of-new-ultrasound-methods
#18
E Boni, L Bassi, A Dallai, F Guidi, V Meacci, A Ramalli, S Ricci, P Tortoli
Open scanners offer an increasing support to the ultrasound researchers who are involved in the experimental test of novel methods. Each system presents specific performance in terms of number of channels, flexibility, processing power, data storage capability and overall dimensions. This paper reports the design criteria and hardware/software implementation details of a new 256-channel ULtrasound Advanced Open Platform (ULA-OP 256). This system is organized in a modular architecture including multiple front-end boards, interconnected by a high-speed (80 Gbit/s) ring, capable of finely controlling all transmit and receive signals...
May 11, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28094044/diagnosis-and-treatment-of-acute-retinal-necrosis-a-report-by-the-american-academy-of-ophthalmology
#19
Scott D Schoenberger, Stephen J Kim, Jennifer E Thorne, Prithvi Mruthyunjaya, Steven Yeh, Sophie J Bakri, Justis P Ehlers
PURPOSE: To evaluate the available evidence in peer-reviewed publications about the diagnosis and treatment of acute retinal necrosis (ARN). METHODS: Literature searches of the PubMed and Cochrane Library databases were last conducted on July 27, 2016. The searches identified 216 unique citations, and 49 articles of possible clinical relevance were reviewed in full text. Of these 49 articles, 27 were deemed sufficiently relevant or of interest, and they were rated according to strength of evidence...
January 13, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28092100/comparing-human-resource-planning-models-in-dentistry-a-case-study-using-canadian-armed-forces-dental-clinics
#20
Jodi L Shaw, Julie W Farmer, Peter C Coyte, Herenia P Lawrence
OBJECTIVES: To compare two methods of allocating general dentists to Canadian Armed Forces (CAF) dental detachments: a dentist-to-population ratio model and a needs-based model. METHODS: Data obtained from CAF sources were analysed to compare models. Times assigned to treatment plan procedures were used as a proxy for treatment needs. Full-time equivalents (FTEs) were used as an indicator for the number of dentists allocated to each detachment. FTE values were adjusted for military dentists to account for time spent on compulsory nonclinical duties...
January 16, 2017: Community Dentistry and Oral Epidemiology
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