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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
#1
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
#2
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
#3
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)...
February 6, 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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
https://www.readbyqxmd.com/read/28091978/patient-specific-optimisation-of-administered-activity-and-acquisition-times-for-18-f-fdg-pet-imaging
#14
Fred Wickham, Helena McMeekin, Maria Burniston, Daniel McCool, Deborah Pencharz, Annah Skillen, Thomas Wagner
BACKGROUND: The purpose of this study is to identify a method for optimising the administered activity and acquisition time for (18)F-FDG PET imaging, yielding images of consistent quality for patients with varying body sizes and compositions, while limiting radiation doses to patients and staff. Patients referred for FDG scans had bioimpedance measurements. They were injected with 3 MBq/kg of (18)F up to 370 MBq and scanned on a Siemens Biograph mCT at 3 or 4 min per bed position...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28089497/biomechanical-comparison-of-standard-and-linked-single-row-rotator-cuff-repairs-in-a-human-cadaver-model
#15
Adam F Meisel, Heath B Henninger, F Alan Barber, Mark H Getelman
PURPOSE: The purpose of this study was to evaluate the time zero cyclic and failure loading properties of a linked single-row rotator cuff repair compared with a standard simple suture single-row repair using triple-loaded suture anchors. METHODS: Eighteen human cadaveric shoulders from 9 matched pairs were dissected, and full-thickness supraspinatus tears were created. The tendon cross-sectional area was recorded. In each pair, one side was repaired with a linked single-row construct and the other with a simple suture single-row construct, both using 2 triple-loaded suture anchors...
January 12, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28088617/assessing-physician-productivity-following-norwegian-hospital-reform-a-panel-and-data-envelopment-analysis
#16
Karl Arne Johannessen, Sverre A C Kittelsen, Terje P Hagen
BACKGROUND: Although health care reforms may improve efficiency at the macro level, less is known regarding their effects on the utilization of health care personnel. Following the 2002 Norwegian hospital reform, we studied the productivity of the physician workforce and the effect of personnel mix on this measure in all nineteen Norwegian hospitals from 2001 to 2013. METHODS: We used panel analysis and non-parametric data envelopment analysis (DEA) to study physician productivity defined as patient treatments per full-time equivalent (FTE) physician...
January 6, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28074000/how-does-rurality-influence-the-staffing-of-social-service-departments-in-nursing-homes
#17
Amy Restorick Roberts, John R Bowblis
PURPOSE OF THE STUDY: Social service departments in nursing homes (NHs) are staffed by qualified social workers (QSWs) and paraprofessionals. Due to greater workforce challenges in rural areas, this article aims to describe the staffing levels and composition of these departments by rurality. DESIGN AND METHODS: Certification and Survey Provider Enhanced Reports data from 2009 to 2015 are used to examine the effect of rurality on social service staffing using random-effects linear panel regressions...
January 9, 2017: Gerontologist
https://www.readbyqxmd.com/read/28066509/development-and-implementation-of-rapid-metabolic-engineering-tools-for-chemical-and-fuel-production-in-geobacillus-thermoglucosidasius-ncimb-11955
#18
Lili Sheng, Katalin Kovács, Klaus Winzer, Ying Zhang, Nigel Peter Minton
BACKGROUND: The thermophile Geobacillus thermoglucosidasius has considerable attraction as a chassis for the production of chemicals and fuels. It utilises a wide range of sugars and oligosaccharides typical of those derived from lignocellulose and grows at elevated temperatures. The latter improves the rate of feed conversion, reduces fermentation cooling costs and minimises the risks of contamination. Full exploitation of its potential has been hindered by a dearth of effective gene tools...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28047500/su-g-iep4-07-feasibility-of-low-dose-18fdg-pet-in-pediatric-oncology-patients
#19
J Zhang, K Binzel, N C Hall, M Natwa, M I Knopp, M V Knopp
PURPOSE: To evaluate and demonstrate the feasibility of low dose FDG PET in pediatric oncology patients using virtual dose reduction as well as true patients PET/CT scans. METHODS: Wholebody 18F-FDG PET/CT of 39 clinical pediatric patients (0.16±0.06MBq/kg) were scanned on a Gemini TF 64 system at 75±5 min post FDG injection using 3min/bed. Based on the 180s/bed listmode PET data, subsets of total counts in 120s, 90s, 60s, 30s and 15s per bed position were extracted for PET reconstruction to simulate lower dose PET at 2/3th, 1/2th, 1/3th, 1/6th and 1/12th dose levels...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047493/su-f-t-625-optimal-treatment-planning-strategy-among-arc-arrangements-for-prostate-sbrt-with-vmat-technique
#20
J Chung, S Kang, T Suh, J Lee, J Kim, K Eom
PURPOSE: The purpose of this study is to determine the optimal treatment planning strategy among the different arc arrangements for prostate stereotactic body radiotherapy (SBRT) plans with volumetric modulated arc therapy (VMAT). METHODS: Ten patients with prostate cancer were selected. The SBRT-VMAT plans for each patient were generated with single-full (181° to 179°; 1FA), single-partial (240° to 120°; 1PA), double-full (181° to 179° and 179° to 181°; 2FA), and double-partial (240° to 120° and 120° to 240°; 2PA) arc arrangements...
June 2016: Medical Physics
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