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https://www.readbyqxmd.com/read/28887825/performance-of-a-multi-leaf-collimator-system-for-mr-guided-radiation-therapy
#1
Bin Cai, Harold Li, Deshan Yang, Vivian Rodriguez, Austen Curcuru, Yuhe Wang, Jie Wen, Rojano Kashani, Sasa Mutic, Olga Green
PURPOSE: To investigate and characterize the performance of a Multi Leaf Collimator (MLC) designed for Cobalt-60 based MR-guided radiation therapy system in a 0.35T magnetic field. METHODS: The MLC design and unique assembly features in the ViewRay MRIdian system were first reviewed. The RF cage shielding of MLC motor and cables were evaluated using ACR phantoms with real time imaging and quantified by signal-to-noise ratio. The dosimetric characterizations, including the leaf transmission, leaf penumbra, tongue and groove effect, were investigated using radiosensitive films...
September 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/28886464/muscle-activity-during-backward-and-forward-running-with-body-weight-support
#2
Kenji Masumoto, Michael T Soucy, Joshua P Bailey, John A Mercer
We investigated muscle activity during backward (BR) and forward (FR) running with body weight support (BWS). Ten participants completed BR and FR on a lower body positive pressure treadmill while selecting a preferred speed (PS) for different BWS conditions (0%, 20%, 40%, 60%, and 80%BWS). Muscle activity from the rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and gastrocnemius (GA), rating of perceived exertion (RPE), preferred stride frequency (PSF), and PS were measured. Magnitude of muscle activity (BF, TA, and GA), RPE, PSF, and PS were not influenced by the interaction of direction and BWS (P>0...
September 5, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28878787/planting-patterns-and-deficit-irrigation-strategies-to-improve-wheat-production-and-water-use-efficiency-under-simulated-rainfall-conditions
#3
Shahzad Ali, Yueyue Xu, Xiangcheng Ma, Irshad Ahmad, Muhammad Kamran, Zhaoyun Dong, Tie Cai, Qianmin Jia, Xiaolong Ren, Peng Zhang, Zhikuan Jia
The ridge furrow (RF) rainwater harvesting system is an efficient way to enhance rainwater accessibility for crops and increase winter wheat productivity in semi-arid regions. However, the RF system has not been promoted widely in the semi-arid regions, which primarily exist in remote hilly areas. To exploit its efficiency on a large-scale, the RF system needs to be tested at different amounts of simulated precipitation combined with deficit irrigation. Therefore, in during the 2015-16 and 2016-17 winter wheat growing seasons, we examined the effects of two planting patterns: (1) the RF system and (2) traditional flat planting (TF) with three deficit irrigation levels (150, 75, 0 mm) under three simulated rainfall intensity (1: 275, 2: 200, 3: 125 mm), and determined soil water storage profile, evapotranspiration rate, grain filling rate, biomass, grain yield, and net economic return...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28862033/random-forest-based-evaluation-of-raman-spectroscopy-for-dengue-fever-analysis
#4
Saranjam Khan, Rahat Ullah, Asifullah Khan, Anabia Sohail, Noorul Wahab, Muhammad Bilal, Mushtaq Ahmed
This work presents the evaluation of Raman spectroscopy using random forest (RF) for the analysis of dengue fever in the infected human sera. A total of 100 dengue suspected blood samples, collected from Holy Family Hospital, Rawalpindi, Pakistan, have been used in this study. Out of these samples, 45 were dengue-positive based on immunoglobulin M (IgM) capture enzyme-linked immunosorbent assay (ELISA) tests. For highlighting the spectral differences between normal and infected samples, an effective machine learning system is developed that automatically learns the pattern of the shift in spectrum for the dengue compared to normal cases and thus is able to predict the unknown class based on the known example...
September 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28858407/neural-correlates-of-food-anticipatory-activity-in-mice-subjected-to-once-or-twice-daily-feeding-periods
#5
Ashutosh Rastogi, Eric M Mintz
In rodents, restricted food access to a limited period each day at a predictable time results in the appearance of food anticipatory activity (FAA). Two shorter periods of food access each day can result in two FAA bouts. In this study, we examine FAA under 12:12 and 18:6 photoperiods in mice (Mus musculus) with one or two food access periods per day, and measure the activation of the suprachiasmatic, dorsomedial, and arcuate nuclei by assaying Fos protein expression, while making use of tissue-type plasminogen activator knockout mice to assess the role of neural plasticity in adaptation to restricted feeding cycles...
August 31, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28846776/nonarteritic-anterior-ischemic-optic-neuropathy-induced-retinal-folds-and-deformations
#6
Mark J Kupersmith, Patrick A Sibony, Sarita Dave
Purpose: We hypothesized that the edema/swelling in the retina due to acute nonarteritic anterior ischemic optic neuropathy (NAION) can induce retinal folds (RF). We determined the pattern and frequency of folds in NAION at presentation and in follow-up, and the relationship between folds and a number of functional and structural parameters over time. Methods: We prospectively studied eyes with acute NAION by spectral-domain optic coherence tomography (SD-OCT). We used transaxial and en face views to evaluate the presence of peripapillary fluid (PPF), peripapillary wrinkles (PPW), RF, choroidal folds (CF), creases, macular edema, and vitreous traction on the optic disc...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28837964/global-processing-of-random-phase-radial-frequency-patterns-but-not-modulated-lines
#7
Robert J Green, J Edwin Dickinson, David R Badcock
Previously, researchers have used circular contours with sinusoidal deformations of the radius (radial frequency [RF] patterns) to investigate the underlying processing involved in simple shape perception. On finding that the rapid improvement in sensitivity to deformation as more cycles of modulation were added was greater than expected from probability summation across sets of local independent detectors, they concluded that global integration of contour information was occurring. More recently, this conclusion has been questioned by researchers using a method of calculating probability summation derived from signal detection theory (Baldwin, Schmidtmann, Kingdom, & Hess, 2016)...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28835251/noise-assisted-multivariate-empirical-mode-decomposition-for-multichannel-emg-signals
#8
Yi Zhang, Peng Xu, Peiyang Li, Keyi Duan, Yuexin Wen, Qin Yang, Tao Zhang, Dezhong Yao
BACKGROUND: Ensemble Empirical Mode Decomposition (EEMD) has been popularised for single-channel Electromyography (EMG) signal processing as it can effectively extract the temporal information of the EMG time series. However, few papers examine the temporal and spatial characteristics across multiple muscle groups in relation to multichannel EMG signals. EXPERIMENT: The experimental data was obtained from the Center for Machine Learning and Intelligent Systems, University of California Irvine (UCI)...
August 23, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28834570/differential-response-patterns-of-kisspeptin-and-rfrp-to-photoperiod-and-sex-steroid-feedback-in-the-djungarian-hamster-phodopus-sungorus
#9
K Rasri-Klosen, V Simonneaux, P Klosen
Many animals synchronize their reproductive activity with the seasons to optimize their offspring's survival. This synchronization involves switching on and off their gonadotropic axis. Ever since their discovery as key regulators of GnRH neurons, the hypothalamic RF-amide peptides kisspeptin and RFRP have been a major focus of research on the seasonal regulation of the gonadotropic axis. In this study we investigated the regulation of both neuropeptides in the Djungarian hamster, a major animal model for the study of seasonal reproduction...
August 23, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28817715/longitudinal-sequencing-in-intramuscular-coordination-a-new-hypothesis-of-dynamic-functions-in-the-human-rectus-femoris-muscle
#10
Christoph von Laßberg, Julia A Schneid, Dominik Graf, Felix Finger, Walter Rapp, Norman Stutzig
The punctum fixum-punctum mobile model has been introduced in previous publications. It describes general principles of intersegmental neuromuscular succession patterns to most efficiently generate specific movement intentions. The general hypothesis of this study is that these principles-if they really do indicate a fundamental basis for efficient movement generation-should also be found in intramuscular coordination and should be indicated by "longitudinal sequencing" between fibers according to the principles of the punctum fixum-punctum mobile model...
2017: PloS One
https://www.readbyqxmd.com/read/28800103/the-ultrasonic-directional-tidal-breathing-pattern-sensor-equitable-design-realization-based-on-phase-information
#11
Arijit Sinharay, Raj Rakshit, Anwesha Khasnobish, Tapas Chakravarty, Deb Ghosh, Arpan Pal
Pulmonary ailments are conventionally diagnosed by spirometry. The complex forceful breathing maneuver as well as the extreme cost of spirometry renders it unsuitable in many situations. This work is aimed to facilitate an emerging direction of tidal breathing-based pulmonary evaluation by designing a novel, equitable, precise and portable device for acquisition and analysis of directional tidal breathing patterns, in real time. The proposed system primarily uses an in-house designed blow pipe, 40-kHz air-coupled ultrasound transreceivers, and a radio frequency (RF) phase-gain integrated circuit (IC)...
August 11, 2017: Sensors
https://www.readbyqxmd.com/read/28794554/mucocutaneous-manifestations-in-patients-with-rheumatoid-arthritis-a-cross-sectional-study-from-eastern-india
#12
Sudip Kumar Ghosh, Debabrata Bandyopadhyay, Surajit Kumar Biswas, Ivoreen Darung
BACKGROUND: Cutaneous manifestations are fairly common in rheumatoid arthritis (RA) and they can help in early diagnosis, prompt treatment, and hence reduced morbidity from the disease. AIMS: The objective of the present study was to find out the different patterns of dermatoses in a group of patients with RA from Eastern India. METHODOLOGY: Consecutive patients fulfilling the American Rheumatism Association 1987 revised criteria for the classification of RA and who had different dermatoses were included in this cross-sectional study done over a period of 8 years in a tertiary care hospital in Eastern India...
July 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28777811/a-machine-learning-approach-to-estimation-of-downward-solar-radiation-from-satellite-derived-data-products-an-application-over-a-semi-arid-ecosystem-in-the-u-s
#13
Qingtao Zhou, Alejandro Flores, Nancy F Glenn, Reggie Walters, Bangshuai Han
Shortwave solar radiation is an important component of the surface energy balance and provides the principal source of energy for terrestrial ecosystems. This paper presents a machine learning approach in the form of a random forest (RF) model for estimating daily downward solar radiation flux at the land surface over complex terrain using MODIS (MODerate Resolution Imaging Spectroradiometer) remote sensing data. The model-building technique makes use of a unique network of 16 solar flux measurements in the semi-arid Reynolds Creek Experimental Watershed and Critical Zone Observatory, in southwest Idaho, USA...
2017: PloS One
https://www.readbyqxmd.com/read/28777669/impact-of-radiofrequency-radiation-on-dna-damage-and-antioxidants-in-peripheral-blood-lymphocytes-of-humans-residing-in-the-vicinity-of-mobile-phone-base-stations
#14
Zothansiama, Mary Zosangzuali, Miriam Lalramdinpuii, Ganesh Chandra Jagetia
Radiofrequency radiations (RFRs) emitted by mobile phone base stations have raised concerns on its adverse impact on humans residing in the vicinity of mobile phone base stations. Therefore, the present study was envisaged to evaluate the effect of RFR on the DNA damage and antioxidant status in cultured human peripheral blood lymphocytes (HPBLs) of individuals residing in the vicinity of mobile phone base stations and comparing it with healthy controls. The study groups matched for various demographic data including age, gender, dietary pattern, smoking habit, alcohol consumption, duration of mobile phone use and average daily mobile phone use...
August 4, 2017: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/28774336/damping-ratio-analysis-of-tooth-stability-under-various-simulated-degrees-of-vertical-alveolar-bone-loss-and-different-root-types
#15
Kuo-Ning Ho, Sheng-Yang Lee, Haw-Ming Huang
BACKGROUND: The purpose of this study was to evaluate the feasibility of using damping ratio (DR) analysis combined with resonance frequency (RF) and periotest (PTV) analyses to provide additional information about natural tooth stability under various simulated degrees of alveolar vertical bone loss and various root types. METHODS: Three experimental tooth models, including upper central incisor, upper first premolar, and upper first molar were fabricated using Ti6Al4V alloy...
August 3, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28770180/the-association-between-food-group-consumption-patterns-and-early-metabolic-syndrome-risk-in-non-diabetic-healthy-people
#16
Rimkyo Yeo, So Ra Yoon, Oh Yoen Kim
We investigated the association between dietary habits/food group consumption patterns and early risk of metabolic syndrome (MetS), a main cause for metabolic disease. Study participants were recruited from the health promotion center in Dong-A University Hospital and public advertisement. Study subjects (n = 243, 21-80 years) were categorized into three groups: Super-healthy (MetS risk factor [MetS RF] = 0, n = 111), MetS-risk carriers (MetS RF = 1-2, n = 96), and MetS (MetS RF ≥ 3, n = 27). Higher regularity in dietary habits (breakfast-everyday, regular eating time, non-frequent overeating, and non-frequent eating-out) was observed in the Super-healthy group than in the MetS-risk carriers, and particularly in the MetS subjects...
July 2017: Clinical Nutrition Research
https://www.readbyqxmd.com/read/28765087/circadian-variability-patterns-predict-and-guide-premature-ventricular-contraction-ablation-procedural-inducibility-and-outcomes
#17
David Hamon, Guillaume Abehsira, Kai Gu, Albert Liu, Marie Blaye-Felice Sadron, Sophie Billet, Thomas Kambur, Mohammed Amer Swid, Noel G Boyle, Gopi Dandamudi, Philippe Maury, Minglong Chen, John M Miller, Nicolas Lellouche, Kalyanam Shivkumar, Jason S Bradfield
BACKGROUND: Infrequent intraprocedural premature ventricular complexes (PVCs) may impede radiofrequency catheter ablation (RFA) outcome, and pharmacologic induction is unpredictable. OBJECTIVE: The purpose of this study was to determine whether PVC circadian variation could help predict drug response. METHODS: Consecutive patients referred for RFA with detailed Holter monitoring and frequent monomorphic PVCs were included. Patients were divided into 3 groups based on hourly PVC count relationship to corresponding mean heart rate (HR) during each of the 24 hours on Holter: fast-HR-dependent PVC (F-HR-PVC) type for a positive correlation (Pearson, P <...
July 29, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28740328/assessment-of-equivalence-of-adipose-tissue-treatment-with-a-noncontact-field-rf-system-delivering-200-w-for-30-min-and-300-w-for-20-min-an-in-vivo-porcine-study
#18
Tae-Rin Kwon, Jong Hwan Kim, Seok Joon, Seok Kyun Mun, Chan Woong Kim, Beom Joon Kim
BACKGROUND AND AIMS: Abdominal circumferential reduction with noncontact high frequency apoptosis-inducing field RF (AiRF) is becoming very popular. The present study compared the treatment results from two different sets of parameters giving the same dose from the same system in an in vivo porcine model. MATERIALS AND METHODS: Two 10 cm × 10 cm areas were symmetrically marked on both sides of the midline (total of 4 areas) over the rectus abdominis muscle of two anesthetized female micropigs...
March 31, 2017: Laser Therapy
https://www.readbyqxmd.com/read/28715442/combining-random-forest-with-multi-block-local-binary-pattern-feature-selection-for-multiclass-head-pose-estimation
#19
Min-Joo Kang, Jung-Kyung Lee, Je-Won Kang
A new head pose estimation technique based on Random Forest (RF) and texture features for facial image analysis using a monocular camera is proposed in this paper, especially about how to efficiently combine the random forest and the features. In the proposed technique a randomized tree with useful attributes is trained to improve estimation accuracy and tolerance of occlusions and illumination. Specifically, a number of features including Multi-scale Block Local Block Pattern (MB-LBP) are extracted from an image, and random features such as the MB-LBP scale parameters, a block coordinate, and a layer of an image pyramid in the feature pool are used for training the tree...
2017: PloS One
https://www.readbyqxmd.com/read/28705474/rf-ablation-in-periventricular-heterotopia-related-epilepsy
#20
Massimo Cossu, Laura Mirandola, Laura Tassi
Drug-resistant focal epilepsy is a common occurrence in patients with gray matter nodular heterotopia (NH), and surgical treatment is often considered in these cases. NH-related epileptogenicity is sustained by complex networks, which may involve the nodules and extralesional cortex in various combinations. Therefore, invasive EEG is usually required to identify the structures involved in seizure generation. It has been reported that surgery may be effective in cases with unilateral lesions, whereas bilateral cases are not optimal candidates for surgical success...
July 3, 2017: Epilepsy Research
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