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https://www.readbyqxmd.com/read/28240007/delineation-of-margins-for-the-planning-target-volume-ptv-for-image-guided-radiotherapy-igrt-of-gastric-cancer-based-on-intrafraction-motion
#1
Paulina Leszczyńska, Wojciech Leszczyński, Jerzy Wydmański, Dębiec Kinga, Agnieszka Namysł Kaletka, Andrzej Tukiendorf, Leszek Hawrylewicz
Background: Application of the image-guided radiotherapy (IGRT) system for gastric cancer involving daily verification of patient positioning on the treatment machine allows minimisation of geometrical errors as a consequence of intra- and inter-fraction motion. The purpose of this study was to define the intrafraction motion in gastric cancer patients during a treatment session based on the IGRT system and designation of margins around the clinical target volume CTV (internal target volume ITV) necessary to delineate the planning target volume (PTV)...
1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28236681/antibacterial-and-antioxidant-properties-of-biosynthesized-zinc-oxide-nanoparticles-from-ceropegia-candelabrum-l-an-endemic-species
#2
M Murali, C Mahendra, Nagabhushan, N Rajashekar, M S Sudarshana, K A Raveesha, K N Amruthesh
Zinc oxide nanoparticles (ZnO-NPs) were synthesized for the first time from any of the species of Ceropegia. Presently, ZnO-NPs were synthesized from the leaf extract of Ceropegia candelabrum with zinc nitrate using a simple hydrothermal process. The synthesized ZnO-NPs showed an absorption peak at 320nm which is one of the characteristic features of ZnO-NPs. The FT-IR characterization revealed a spectrum band at 551.93cm(-1) corresponding to the functional group metal oxide. SEM images showed agglomeration of nanoparticles with a hexagonal shape...
February 14, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28235374/energy-of-the-isolated-metastable-iron-nickel-fcc-nanocluster-with-a-carbon-atom-in-the-tetragonal-interstice
#3
Natalya V Bondarenko, Anatoliy V Nedolya
The energy of the isolated iron-nickel nanocluster was calculated by molecular mechanics method using Lennard-Jones potential. The cluster included a carbon atom that drifted from an inside octahedral interstice to a tetrahedral interstice in [Formula: see text] direction and after that in <222> direction to the surface. In addition, one of 14 iron atoms was replaced by a nickel atom, the position of which was changing during simulation.The energy of the nanocluster was estimated at the different interatomic distances...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28231267/accuracy-of-optical-biometry-combined-with-placido-disc-corneal-topography-for-intraocular-lens-power-calculation
#4
Giacomo Savini, Kenneth J Hoffer, Piero Barboni, Nicole Balducci, Domenico Schiano-Lomoriello, Pietro Ducoli
PURPOSE: To investigate the accuracy of a new optical biometer for intraocular lens (IOL) power calculation in eyes undergoing cataract surgery. METHODS: Consecutive eyes of patients undergoing cataract surgery with the same IOL model were enrolled in a prospective cohort study. Axial length (AL) and corneal power were measured with an optical biometer based on optical low-coherence interferometry and Placido-disc corneal topography. IOL power was calculated with the Hoffer Q, Holladay 1 and SRK/T formulas...
2017: PloS One
https://www.readbyqxmd.com/read/28227796/estimation-of-joint-center-and-measurement-of-finger-motion-by-inertial-sensors
#5
Keisuke Kitano, Akihito Ito, Nobutaka Tsujiuchi, Shigeru Wakida, Keisuke Kitano, Akihito Ito, Nobutaka Tsujiuchi, Shigeru Wakida, Akihito Ito, Shigeru Wakida, Keisuke Kitano, Nobutaka Tsujiuchi
The authors developed a wearable finger motion measurement system using inertial and geomagnetic sensors. Using this system, motion and posture of the hands and fingers can be measured. However, the joint center and segment axis cannot be accurately measured in a previous study using the sensors. Therefore, the authors proposed a method of estimating the joint center and segment lengths. This method utilizes the fact that the calculation formula of the rotational acceleration in the sensor's coordinate system is the vector product...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227534/quantifying-the-human-finger-reachable-space
#6
Trieu H Pham, Pubudu N Pathirana, Trieu H Pham, Pubudu N Pathirana, Trieu H Pham, Pubudu N Pathirana
Describing the flexibility of the hand using the reachable space concept has drawn the attention of many researchers in recent years. Existing approaches involving numerical techniques to obtain the reachable space are generally computationally expensive. In this study, we propose a resource-friendly approach to determine and quantify the bidimensional reachable space of the finger. The fundamental idea of the approach connects to a set of arc formulae for the boundary of the reachable space. These formulae of the boundary result a unique description to calculate the area of the reachable space using Green's theorem...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227331/assessing-the-development-of-fetal-myocardial-function-by-a-novel-doppler-myocardial-performance-index
#7
Ahsan H Khandoker, F Marzbanrad, Y Kimura, Saeed Al Nuaimi, M Palaniswami, Ahsan H Khandoker, F Marzbanrad, Y Kimura, Saeed Al Nuaimi, M Palaniswami, Ahsan H Khandoker, Y Kimura, Saeed Al Nuaimi, F Marzbanrad, M Palaniswami
Doppler-derived myocardial performance index are used to assess aspects of systolic and diastolic function in adult as well as fetal heart. The Tei Index (TI) is a useful and non-invasive tool. The aim of this study was to determine normal values of fetal left ventricular (LV) TI in early (16-32 weeks) and late trimester (35-41 weeks) fetuses and to develop a new myocardial performance index (K-index; KI) which focuses on fetal diastolic interval when oxygenated blood from the placenta filled in the LV. Simultaneous recordings of Doppler Ultrasound Signal (DUS) of the LV outflow tracts and fetal electrocardiogram signals were obtained in 55 early- and late-trimester fetuses...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226391/closed-form-reml-estimators-and-sample-size-determination-for-mixed-effects-models-for-repeated-measures-under-monotone-missingness
#8
Yongqiang Tang
We derive the closed-form restricted maximum likelihood estimator and Kenward-Roger's variance estimator for fixed effects in the mixed effects model for repeated measures (MMRM) when the missing data pattern is monotone. As an important application of the analytic result, we present the formula for calculating the power of treatment comparison using the Wald t-test with the Kenward-Roger adjusted variance estimate in MMRM. It allows adjustment for baseline covariates without the need to specify the covariate distribution in randomized trials...
February 22, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28225252/luminescent-re-i-carbonyl-complexes-as-trackable-photocorms-for-co-delivery-to-cellular-targets
#9
Indranil Chakraborty, Jorge Jimenez, W M C Sameera, Masako Kato, Pradip K Mascharak
A family of Re(I) carbonyl complexes of general formula [ReX(CO)3(phen)](0/1+) (where X = Cl(-), CF3SO3(-), MeCN, PPh3, and methylimidazole) derived from 1,10-phenanthroline (phen) exhibits variable emission characteristics depending on the presence of the sixth ancillary ligand/group (X). All complexes but with X = MeCN exhibit moderate CO release upon irradiation with low-power UV light and are indefinitely stable in anaerobic/aerobic environment in solution as well as in solid state when kept under dark condition...
February 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28224191/predicting-the-post-operative-length-of-stay-for-the-orthopaedic-trauma-patient
#10
Deepak Chona, Nikita Lakomkin, Catherine Bulka, Idine Mousavi, Parth Kothari, Ashley C Dodd, Michelle S Shen, William T Obremskey, Manish K Sethi
PURPOSE: Length of stay (LOS) is a major driver of cost and quality of care. A bundled payment system makes it essential for orthopaedic surgeons to understand factors that increase a patient's LOS. Yet, minimal data regarding predictors of LOS currently exist. Using the ACS-NSQIP database, this is the first study to identify risk factors for increased LOS for orthopaedic trauma patients and create a personalized LOS calculator. METHODS: All orthopaedic trauma surgery between 2006 and 2013 were identified from the ACS-NSQIP database using CPT codes...
February 21, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28222614/identification-of-the-appropriate-fixation-site-to-avoid-peritoneal-catheter-migration-based-on-a-mechanical-analysis
#11
Yujuan Wang, Yao Zou, Xinghua Chen, Jili Zhu, Cuizhi Xiang, Houjun Jia, Guohua Ding, Huiming Wang
AIM: To conduct mechanical analysis on the relationship between abdominal wall fixation point and the displacement of catheter top, and establish the finite element model for the complex forces and conditions that the catheter wears in human abdominal cavity, in order to provide the scientific basis for optimizing the catheter position in abdominal wall fixation method. METHODS: Using the PIPE59 finite elements to divide units, and taking the lower part of catheter, that is, below interior polyester cuff to simulate and compute the displacement formula...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/28222035/nutritional-status-and-metabolic-profile-in-neurologically-impaired-pediatric-surgical-patients
#12
Gloria Pelizzo, Valeria Calcaterra, Veronica Carlini, Mario Fusillo, Matteo Manuelli, Catherine Klersy, Noemi Pasqua, Elona Luka, Riccardo Albertini, Mara De Amici, Hellas Cena
BACKGROUND: Malnutrition is reported in pediatric neuromotor disability and impacts the child's health. We described the nutritional and metabolic status in neurologically impaired (NI) children undergoing surgery. METHODS: Anthropometry, body composition, hormonal and nutritional evaluations were performed in 44 NI subjects (13.7±8.0 years). Energy needs were calculated by Krick's formula. Metabolic syndrome (MS) was defined applying the following criteria (≥3 defined MS): fasting blood glucose >100 mg/dL and/or homeostasis model assessment for insulin resistance (HOMA-IR) >97...
February 21, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/28222015/plasma-levels-of-endothelin-1-and-renal-function-among-young-and-healthy-adults
#13
Andreas Fischer, Matthias Bossard, Stefanie Aeschbacher, Peter Egli, Carolin Cordewener, Joel Estis, John Todd, Martin Risch, Lorenz Risch, David Conen
BACKGROUND: Endothelin-1 (ET-1), a vasoconstrictive and pro-inflammatory peptide, is associated with several cardiovascular risk factors and outcomes. We aimed to investigate the association of plasma ET-1 levels and renal function among young and healthy adults. METHODS: Individuals aged 25-41 years were enrolled in a population-based cohort study. Main exclusion criteria were established kidney disease, cardiovascular diseases, diabetes mellitus and a body mass index>35 kg/m2...
February 21, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28220303/estimation-of-stature-from-femur-length-measured-using-computed-tomography-after-the-analysis-of-three-dimensional-characteristics-of-femur-bone-in-korean-cadavers
#14
Sookyoung Lee, Ho-Hyeon Gong, Jin-Young Hyun, Hyung-Nam Koo, Han-Young Lee, Nak-Eun Chung, Young-Shik Choi, Kyung-Moo Yang, Byung Ha Choi
Estimation of stature is a basic and important forensic procedure in identifying decomposed or skeletonized bodies. Due to advances in radiologic equipment, forensic science frequently uses computed tomography (CT) and software to apply these findings to investigations. Technical developments have increased the accuracy of the measurement of various bones. However, there are still some inaccuracies, such as defining correct landmarks in three-dimensional (3D) images. Femur length is frequently used for calculation of stature, but because it is a 3D structure, the digital image may not always correlate with the femur length measured with an osteometric board...
February 20, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28220183/quantitative-light-induced-fluorescence-images-and-digital-photographs-reproducibility-of-manually-marked-demineralisations
#15
Rosalia Tatano, Eva E Ehrlich, Benjamin Berkels, Ekaterina Sirazitdinova, Thomas M Deserno, Ulrike B Fritz
OBJECTIVE: Hard tooth tissue demineralisation is an undesirable side effect of orthodontic treatment with fixed appliances. Whereas both clinically and in digital photographs (DP), demineralisations appear as white spot lesions, WSLs appear as dark areas when quantitative light-induced fluorescence (QLF) imaging is used. This study aims at comparing the reproducibility of the detection of decalcified tooth areas in DP and QLF. MATERIALS AND METHODS: DP and QLF pairs were acquired from 139 teeth of 32 patients after braces removal...
February 20, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28218526/dinuclear-metallacycles-with-single-m-x-m-bridges-x-cl-br-m-fe-ii-co-ii-ni-ii-cu-ii-zn-ii-cd-ii-strong-antiferromagnetic-superexchange-interactions
#16
Daniel L Reger, Andrea E Pascui, Elizabeth A Foley, Mark D Smith, Julia Jezierska, Agnieszka Wojciechowska, Sebastian A Stoian, Andrew Ozarowski
A series of monochloride-bridged, dinuclear metallacycles of the general formula [M2(μ-Cl)(μ-L)2](ClO4)3 have been prepared using the third-generation, ditopic bis(pyrazolyl)methane ligands L = m-bis[bis(1-pyrazolyl)methyl]benzene (Lm), M = Cu(II), Zn(II), and L = m-bis[bis(3,5-dimethyl-1-pyrazolyl)methyl]benzene (Lm*), M = Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II). These complexes were synthesized from the direct reactions of M(ClO4)2·6H2O, MCl2, and the ligand, Lm or Lm*, in the appropriate stoichiometric amounts...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28213210/comparison-of-sensitivity-to-artificial-spectral-errors-and-multivariate-lod-in-nir-spectroscopy-determining-the-performance-of-miniaturizations-on-melamine-in-milk-powder
#17
Raphael Henn, Christian G Kirchler, Maria-Elisabeth Grossgut, Christian W Huck
This study compared three commercially available spectrometers - whereas two of them were miniaturized - in terms of prediction ability of melamine in milk powder (infant formula). Therefore all spectra were split into calibration- and validation-set using Kennard Stone and Duplex algorithm in comparison. For each instrument the three best performing PLSR models were constructed using SNV and Savitzky Golay derivatives. The best RMSEP values were 0.28g/100g, 0.33g/100g and 0.27g/100g for the NIRFlex N-500, the microPHAZIR and the microNIR2200 respectively...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212904/level-of-agreement-between-forearm-and-upper-arm-blood-pressure-measurements-in-patients-with-large-arm-circumference
#18
Sheri Watson, Marita Aguas, Pat Colegrove, Nancy Foisy, Bonnie Jondahl, Zoe Anastas
PURPOSE: The purpose of the study was to determine if forearm blood pressures (BPs) measured in three different locations agree with the recommended upper arm location for noninvasive BP measurement. DESIGN: A method-comparison design was used. METHODS: In a convenience sample of postanesthesia care unit patients with large upper arm circumference, BP's were obtained in three different forearm locations (lower forearm, middle forearm, and upper forearm) and compared to upper arm BP using an automated BP measuring device...
February 2017: Journal of Perianesthesia Nursing: Official Journal of the American Society of PeriAnesthesia Nurses
https://www.readbyqxmd.com/read/28212674/proportion-of-dementia-in-australia-explained-by-common-modifiable-risk-factors
#19
Kimberly Ashby-Mitchell, Richard Burns, Jonathan Shaw, Kaarin J Anstey
BACKGROUND: At present, dementia has no known cure. Interventions to delay onset and reduce prevalence of the disease are therefore focused on risk factor reduction. Previous population attributable risk estimates for western countries may have been underestimated as a result of the relatively low rates of midlife obesity and the lower weighting given to that variable in statistical models. METHODS: Levin's Attributable Risk which assumes independence of risk factors was used to calculate the proportion of dementia attributable to seven modifiable risk factors (midlife obesity, physical inactivity, smoking, low educational attainment, diabetes mellitus, midlife hypertension and depression) in Australia...
February 17, 2017: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/28211934/a-computational-assessment-of-the-electronic-thermoelectric-and-defect-properties-of-bournonite-cupbsbs3-and-related-substitutions
#20
Alireza Faghaninia, Guodong Yu, Umut Aydemir, Max Wood, Wei Chen, Gian-Marco Rignanese, G Jeffrey Snyder, Geoffroy Hautier, Anubhav Jain
Bournonite (CuPbSbS3) is an earth-abundant mineral with potential thermoelectric applications. This material has a complex crystal structure (space group Pmn21 #31) and has previously been measured to exhibit a very low thermal conductivity (κ < 1 W m(-1) K(-1) at T ≥ 300 K). In this study, we employ high-throughput density functional theory calculations to investigate how the properties of the bournonite crystal structure change with elemental substitutions. Specifically, we compute the stability and electronic properties of 320 structures generated via substitutions {Na-K-Cu-Ag}{Si-Ge-Sn-Pb}{N-P-As-Sb-Bi}{O-S-Se-Te} in the ABCD3 formula...
February 17, 2017: Physical Chemistry Chemical Physics: PCCP
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