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https://www.readbyqxmd.com/read/28102960/nine-degrees-of-freedom-flexmap-for-a-cone-beam-computed-tomography-imaging-device-with-independently-movable-source-and-detector
#1
Peter Keuschnigg, Daniel Kellner, Karl Fritscher, Andrea Zechner, Ulrich Mayer, Philipp Huber, Felix Sedlmayer, Heinz Deutschmann, Philipp Steininger
PURPOSE: Couch-mounted cone-beam computed tomography (CBCT) imaging devices with independently rotatable x-ray source and flat-panel detector arms for acquisitions of arbitrary regions of interest (ROI) have recently been introduced in image-guided radiotherapy (IGRT). This work analyzes mechanical limitations and gravity-induced effects influencing the geometric accuracy of images acquired with arbitrary angular constellations of source and detector in nonisocentric trajectories, which is considered essential for IGRT...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102959/x-ray-scatter-correction-for-multi-source-interior-computed-tomography
#2
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/28102939/what-is-the-relationship-between-increased-access-to-haart-relationship-status-and-fertility-decisions-amongst-hiv-positive-women-a-literature-review-and-meta-analysis
#3
REVIEW
Abigail Burgess, Edward Purssell
AIMS AND OBJECTIVES: To investigate the relationship between fertility decisions, to have already had a child or to desire to have one in the future, and the prognostic factors of; access to antiretrovirals, the time since these became widely available (year of the study) and relationship status. BACKGROUND: There have been significant advances in the treatment of Human Immunodeficiency Virus (HIV) with the advent of antiretroviral therapy which has been used to successfully reduce the rate of mother to child transmission; leading researchers to hypothesise that HIV positive women may desire to have children more so now than in the past...
January 19, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28102925/the-effect-of-motor-cortex-stimulation-on-central-poststroke-pain-in-a-series-of-16-patients-with-a-mean-follow-up-of-28-months
#4
Xiaolei Zhang, Yongsheng Hu, Wei Tao, Hongwei Zhu, Dongsheng Xiao, Yongjie Li
OBJECTIVE: To investigate the effect of motor cortex stimulation (MCS) on central poststroke pain (CPSP) and the outcome predictors associated with medium- to long-term results. MATERIALS AND METHODS: This is a retrospective review of 16 CPSP patients treated with MCS with a mean follow-up of 28.2 months. The pain intensity was assessed based on the visual analogue scale (VAS) before surgery and at various follow-up visits. An effective outcome was determined to be at least 40% pain relief...
January 19, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28102901/risk-of-arrhythmic-death-in-ischemic-heart-disease-a-prospective-controlled-observer-blind-investigation-over-10-years
#5
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/28102887/clinical-trial-of-nintedanib-in-patients-with-recurrent-or-metastatic-salivary-gland-cancer-of-the-head-and-neck-a-multicenter-phase-2-study-korean-cancer-study-group-hn14-01
#6
Youjin Kim, Su Jin Lee, Ji Yun Lee, Se-Hoon Lee, Jong-Mu Sun, Keunchil Park, Ho Jung An, Jae Yong Cho, Eun Joo Kang, Ha-Young Lee, Jinsoo Kim, Bhumsuk Keam, Hye Ryun Kim, Kyoung Eun Lee, Moon Young Choi, Ki Hyeong Lee, Myung-Ju Ahn
BACKGROUND: Salivary gland cancers (SGCs) are uncommon and account for less than 5% of all head and neck cancers, but they are histologically heterogeneous. No specific therapy, including targeted agents, has consistently improved clinical outcomes in recurrent/metastatic SGC. Recent studies suggest that vascular endothelial growth factor receptor (VEGFR) and platelet-derived growth factor receptor (PDGFR) play important roles in SGC. Nintedanib is a potent small-molecule, triple-receptor tyrosine kinase inhibitor (VEGFR1, VEGFR2, and VEGFR3; fibroblast growth factor receptor 1 [FGFR1], FGFR2, and FGFR3; and PDGFRα and PDGFRß)...
January 19, 2017: Cancer
https://www.readbyqxmd.com/read/28102883/exploring-prognostic-factors-for-her2-positive-metastatic-breast-cancer-a-retrospective-cohort-study-in-a-major-swiss-hospital
#7
Lilian Bringolf, Bernhard Pestalozzi, Daniel Fink, Konstantin Dedes
BACKGROUND: Trastuzumab (Herceptin®, Roche) has significantly improved the prognosis of patients with HER2-positive metastatic breast cancer. Some patients remain in remission for many years. However, there are no prognostic markers associated with long-term survival. This study aimed to analyse treatment patterns of HER2-positive metastatic breast cancer at a single institution and explore prognostic factors for long-term survival after HER2-targeted treatment. PATIENTS AND METHODS: This was a retrospective cohort study of all patients with HER2-positive metastatic breast cancer receiving first-line treatment with HER2-targeted therapy between 2004 and 2014 at the University Hospital of Zurich (n = 81)...
January 19, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28102855/the-prevalence-of-feeding-problems-in-children-formerly-treated-in-a-neonatal-intensive-care-unit
#8
M Hoogewerf, H J Ter Horst, H Groen, T Nieuwenhuis, A F Bos, M W G van Dijk
OBJECTIVE: To determine the prevalence of oral feeding problems in neonatal intensive care unit (NICU) graduates at 1 to 2 years, and to identify clinical risk factors during NICU admission. STUDY DESIGN: Observational cohort study of 378 children, who received level III/IV NICU care for 4 days or more in 2011 to 2012, chromosomal abnormalities excluded. We detected feeding problems in four gestational age (GA) groups (<28, 28 to 31, 32 to 36 weeks, and term-borns) using the Dutch standardized Screeningslijst Eetgedrag Peuters, and collected clinical factors for logistic regression analyses...
January 19, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28102853/skin-to-skin-contact-after-birth-and-the-natural-course-of-neurosteroid-levels-in-healthy-term-newborns
#9
K R McCallie, N W Gaikwad, M E Castillo Cuadrado, M Aleman, J E Madigan, D K Stevenson, V K Bhutani
OBJECTIVE: To determine the postnatal course of neurosteroid levels in relation to gender, mode of delivery and the extent of skin-to-skin (STS) contact during the first days of life in healthy term newborns. STUDY DESIGN: Prospective observational study of 39 neonates in which parents recorded total duration of STS in the first 2 days and nine neurosteroids (dehydroepiandrosterone-sulfate, progesterone, pregnenolone, pregnenolone-sulfate, allopregnanolone, isopregnanolone, epipregnanolone, pregnanolone and pregnanolone-sulfate) were assayed from blood samples at birth and at 1-2 days of age...
January 19, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28102852/anthropometric-trends-from-1997-to-2012-in-infants-born-at-%C3%A2-28-weeks-gestation-or-less
#10
N Wells, T A Stokes, K Ottolini, C H Olsen, A R Spitzer, C E Hunt
OBJECTIVE: Postnatal growth failure is common after preterm birth, in particular for infants born at ⩽28 weeks' gestation, but it is unknown if growth-to-term equivalent age has improved over the years as neonatal intensive care in general, and infant nutrition in particular, have improved. The objective of the study was to evaluate anthropometric trends at NICU discharge for infants born at ⩽28 weeks' gestation using a large national database. STUDY DESIGN: Analysis of growth in weight, length, head circumference and body mass index (kg m(2)) in 23 005 infants born in 1997 to 2012 who survived to neonatal intensive care unit discharge at ⩽41 weeks' postmenstrual age...
January 19, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28102837/precise-and-efficient-scarless-genome-editing-in-stem-cells-using-correct
#11
Dylan Kwart, Dominik Paquet, Shaun Teo, Marc Tessier-Lavigne
CRISPR/Cas9 is a promising tool for genome-editing DNA in cells with single-base-pair precision, which allows novel in vitro models of human disease to be generated-e.g., in pluripotent stem cells. However, the accuracy of intended sequence changes can be severely diminished by CRISPR/Cas9's propensity to re-edit previously modified loci, causing unwanted mutations (indels) alongside intended changes. Here we describe a genome-editing framework termed consecutive re-guide or re-Cas steps to erase CRISPR/Cas-blocked targets (CORRECT), which, by exploiting the use of highly efficacious CRISPR/Cas-blocking mutations in two rounds of genome editing, enables accurate, efficient and scarless introduction of specific base changes-for example, in human induced pluripotent (iPS) stem cells...
February 2017: Nature Protocols
https://www.readbyqxmd.com/read/28102828/thermodynamic-scaling-of-relaxation-insights-from-anharmonic-elasticity
#12
Sebastiano Bernini, Francesco Puosi, Dino Leporini
We investigate by Molecular Dynamics simulations of a molecular liquid the thermodynamic scaling (TS) of the structural relaxation time $\tau_\alpha$ in terms of the quantity $T\rho^{-\gamma_{ts}}$ where T and rho are the temperature and the density, respectively. The liquid does not exhibit strong virial-energy correlations. We propose how to evaluate both the characteristic exponent $\gamma_{ts}$ and the TS master curve by resorting to experimentally accessible quantities characterising the anharmonic elasticity and no details about the microscopic interactions...
January 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28102818/is-cell-size-a-spandrel
#13
Ariel Amir
All organisms control the size of their cells. We focus here on the question of size regulation in bacteria, and suggest that the quantitative laws governing cell size and its dependence on growth rate may arise as byproducts of a regulatory mechanism which evolved to support multiple DNA replication forks. In particular, we show that the increase of bacterial cell size during Lenski's long-term evolution experiments is a natural outcome of this proposal. This suggests that, in the context of evolution, cell size may be a 'spandrel'...
January 19, 2017: ELife
https://www.readbyqxmd.com/read/28102779/long-term-dust-aerosol-production-from-natural-sources-in-iceland
#14
Pavla Dagsson-Waldhauserova, Olafur Arnalds, Haraldur Olafsson
: Iceland is a volcanic island in the North Atlantic Ocean with maritime climate. In spite of moist climate, large areas are with limited vegetation cover where >40% of Iceland is classified with considerable to very severe erosion and 21% of Iceland is volcanic sandy deserts. Not only do natural emissions from these sources influenced by strong winds affect regional air quality in Iceland ("Reykjavik haze"), but dust particles are transported over the Atlantic ocean and Arctic Ocean >1000 km at times...
February 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28102777/comparison-of-early-vascular-morphological-changes-between-bioresorbable-poly-l-lactic-acid-scaffolds-and-metallic-stents-in-porcine-iliac-arteries
#15
Yasuhito Sekimoto, Hideaki Obara, Kentaro Matsubara, Naoki Fujimura, Hirohisa Harada, Yuko Kitagawa
Bioresorbable scaffolds have the potential to overcome several problems associated with metallic stents. Bioresorbable poly-L-lactic acid (PLLA) scaffold implantation for the treatment of peripheral artery disease has already been reported in animal models and clinical trials; however, no studies comparing PLLA scaffolds and bare metal stents (BMSs) with regard to early vascular morphological changes, identified using intravascular ultrasound (IVUS) analysis, have been reported. In this study, PLLA scaffolds and BMSs were implanted bilaterally in iliac arteries of five miniature pigs...
January 19, 2017: Organogenesis
https://www.readbyqxmd.com/read/28102707/patient-dosimetry-audit-for-establishing-local-diagnostic-reference-levels-for-nuclear-medicine-ct
#16
Matthew Gardner, Ngonidzashe M Katsidzira, Erin Ross, Elizabeth A Larkin
OBJECTIVES: To establish a system for patient dosimetry audit and setting of Local Diagnostic Reference Levels (LDRLs) for Nuclear Medicine (NM) CT. METHODS: Computed Radiological Information System (CRIS) data were matched with NM paper records which provided the body region and dose mode for NMCT carried out at a large UK hospital. It was necessary to divide data in terms of the NM examination type, body region and dose mode. The mean and standard deviation Dose Length Products (DLPs) for common NMCT examinations were then calculated and compared to the proposed National DRLs (NDRLs)...
January 19, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28102699/tracheostomy-weaning-outcomes-in-relation-to-the-site-of-acquired-brain-injury-a-retrospective-case-series
#17
Kay Mitton, Krystyna Walton, Manoj Sivan
OBJECTIVE: To analyse whether the outcome of tracheostomy weaning is influenced by the site of injury in acquired brain injury. METHODS: A retrospective case review of all the consecutive admissions to an acute neurorehabilitation unit in a 2-year period was performed. Patients with a diagnosis of acquired brain injury and tracheostomy in situ were included in this study. RESULTS: One hundred and six patients were included in the analysis...
January 19, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28102657/the-optimal-strategy-of-percutaneous-coronary-intervention-for-st-elevation-myocardial-infarction-patients-with-multivessel-disease-an-updated-meta-analysis-of-9-randomized-controlled-trials
#18
Zhong G Fan, Xiao F Gao, Xiao B Li, Wen X Mao, Li W Chen, Nai L Tian
INTRODUCTION: The optimal strategy of percutaneous coronary intervention (PCI) for patients with ST-elevation myocardial infarction (STEMI) and multivessel disease (MVD) still remains controversial. This study sought to explore the optimal PCI strategy for those patients. EVIDENCE ACQUISITION: Medline, EMBASE and the Cochrane Controlled Trials Registry were searched for relevant studies. We analyzed the comparison of major adverse cardiac events (MACEs) as the primary end point between the preventive PCI strategy and the culprit only PCI strategy (CV-PCI)...
April 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/28102654/tuberculosis-and-tuberculin-skin-test-reactivity-in-pediatric-patients-with-celiac-disease
#19
Nafiye Urganci, Derya Kalyoncu
BACKGROUND: The aim of the study was to determine tuberculin skin test reactivity and associated factors in pediatric patients with celiac disease (CD). METHODS: Tuberculin skin test (TST) was performed on 28 patients with CD aged from 1 year to 15 years (mean, 6.64±4.8) and 28 healthy age and sex-matched children. The association between TST reactivity and parameters such as age, gender, malnutrition, clinical presentation, compliance to gluten free diet and response to hepatitis A and B vaccinations were determined...
February 2017: Minerva Pediatrica
https://www.readbyqxmd.com/read/28102636/thalamic-deep-brain-stimulation-for-refractory-tourette-syndrome-clinical-evidence-for-increasing-disbalance-of-therapeutic-effects-and-side-effects-at-long-term-follow-up
#20
Anouk Y J M Smeets, Annelien A Duits, Albert F G Leentjens, Koen Schruers, Vivianne van Kranen-Mastenbroek, Veerle Visser-Vandewalle, Yasin Temel, Linda Ackermans
OBJECTIVE: Thalamic deep brain stimulation (DBS) is effective in reducing tics in patients with refractory Tourette syndrome at the short-term. Here, we report on the long-term outcome. MATERIALS AND METHODS: Seven patients underwent bilateral DBS between 2001 and 2008. The target was the centromedian nucleus, substantia periventricularis and nucleus ventro-oralis internus cross point of the thalamus. The effect on tics and side effects were evaluated with a variable follow-up duration of 12 to 78 months...
January 19, 2017: Neuromodulation: Journal of the International Neuromodulation Society
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