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https://www.readbyqxmd.com/read/28550516/mapping-the-spatio-temporal-distribution-of-key-vegetation-cover-properties-in-lowland-river-reaches-using-digital-photography
#1
Veerle Verschoren, Jonas Schoelynck, Kerst Buis, Fleur Visser, Patrick Meire, Stijn Temmerman
The presence of vegetation in stream ecosystems is highly dynamic in both space and time. A digital photography technique is developed to map aquatic vegetation cover at species level, which has a very high spatial and a flexible temporal resolution. A digital single-lens reflex (DSLR) camera mounted on a handheld telescopic pole is used. The low-altitude (5 m) orthogonal aerial images have a low spectral resolution (red-green-blue), high spatial resolution (∼1.9 pixels cm(-2), ∼1.3 cm length) and flexible temporal resolution (monthly)...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28549694/d-dimer-is-associated-with-arterial-and-venous-coronary-artery-bypass-graft-occlusion
#2
Alessandro Parolari, Laura Cavallotti, Daniele Andreini, Veronika Myasoedova, Cristina Banfi, Marina Camera, Paolo Poggio, Fabio Barili, GianLuca Pontone, Luciana Mussoni, Chiara Centenaro, Francesco Alamanni, Elena Tremoli
OBJECTIVE: In this observational prospective study, we assessed the role of clinical variables and circulating biomarkers in graft occlusion at 18 months to identify a signature for graft occlusion. METHODS: A total of 330 patients undergoing primary elective coronary artery bypass grafting were enrolled. Blood collection for biomarker assessment was performed before surgery and discharge. Patients were then scheduled to undergo coronary computed tomography angiography at 18 months follow-up, and 179 patients underwent coronary computed tomography angiography 18 ± 2 months postoperatively...
April 27, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28549599/accuracy-map-of-an-optical-motion-capture-system-with-42-or-21-cameras-in-a-large-measurement-volume
#3
Alexander M Aurand, Jonathan S Dufour, William S Marras
Optical motion capture is commonly used in biomechanics to measure human kinematics. However, no studies have yet examined the accuracy of optical motion capture in a large capture volume (>100m(3)), or how accuracy varies from the center to the extreme edges of the capture volume. This study measured the dynamic 3D errors of an optical motion capture system composed of 42 OptiTrack Prime 41 cameras (capture volume of 135m(3)) by comparing the motion of a single marker to the motion reported by a ThorLabs linear motion stage...
May 17, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28548462/neurocognitive-mechanisms-of-real-world-autobiographical-memory-retrieval-insights-from-studies-using-wearable-camera-technology
#4
REVIEW
Tiffany E Chow, Jesse Rissman
In recent years, investigation into the cognitive and neural mechanisms of autobiographical memory has been aided by the use of experimental paradigms incorporating wearable camera technology. By effortlessly capturing first-person images of one's life events, these cameras provide a rich set of naturalistic stimuli that can later be used to trigger the recall of specific episodes. Here, we chronicle the development and progression of such studies in behavioral and neuroimaging examinations of both clinical and nonclinical adult populations...
May 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28548141/glass-capillary-based-microfluidic-elisa-for-rapid-diagnostics
#5
Xiaotian Tan, Maung Kyaw Khaing Oo, Yuan Gong, Yaoxin Li, Hongbo Zhu, Xudong Fan
Enzyme-linked immunosorbent assay (ELISA) is widely used in medical diagnostics and fundamental biological research due to its high specificity and reproducibility. However, the traditional 96-well-plate based ELISA still suffers from several notable drawbacks, such as long assay time (4-6 hours), burdensome procedures and large sample/reagent volumes (∼100 μl), which significantly limit traditional ELISA's applications in rapid clinical diagnosis and quasi-real-time prognosis of some fast-developing diseases...
May 26, 2017: Analyst
https://www.readbyqxmd.com/read/28545229/an-iterative-distortion-compensation-algorithm-for-camera-calibration-based-on-phase-target
#6
Yongjia Xu, Feng Gao, Hongyu Ren, Zonghua Zhang, Xiangqian Jiang
Camera distortion is a critical factor affecting the accuracy of camera calibration. A conventional calibration approach cannot satisfy the requirement of a measurement system demanding high calibration accuracy due to the inaccurate distortion compensation. This paper presents a novel camera calibration method with an iterative distortion compensation algorithm. The initial parameters of the camera are calibrated by full-field camera pixels and the corresponding points on a phase target. An iterative algorithm is proposed to compensate for the distortion...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28543966/development-of-a-quantitative-assessment-method-of-pigmentary-skin-disease-using-ultraviolet-optical-imaging
#7
Onseok Lee, Sunup Park, Jaeyoung Kim, Chilhwan Oh
BACKGROUND/PURPOSE: The visual scoring method has been used as a subjective evaluation of pigmentary skin disorders. Severity of pigmentary skin disease, especially melasma, is evaluated using a visual scoring method, the MASI (melasma area severity index). This study differentiates between epidermal and dermal pigmented disease. The study was undertaken to determine methods to quantitatively measure the severity of pigmentary skin disorders under ultraviolet illumination. METHODS: The optical imaging system consists of illumination (white LED, UV-A lamp) and image acquisition (DSLR camera, air cooling CMOS CCD camera)...
May 21, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/28543331/integration-of-optical-applicator-with-balloon-catheter-for-photothermal-treatment-of-biliary-stricture
#8
Jinoh Bak, Jieun Hwang, Suhyun Park, Hyun W Kang
BACKGROUND AND OBJECTIVE: Bile duct stricture is an uncommon disease in gastroenterology resulting from postoperative trauma. In spite of non-surgical treatments, clinical outcomes for the biliary strictures still encounter high restenosis and stent migration. The objective of the current study was to investigate the feasible application of a balloon catheter-integrated diffing applicator to thermally treat the bile duct stricture. MATERIALS AND METHODS: 400-μm optical fibers were micro-machined and then integrated with an inflatable balloon catheter...
May 25, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28541917/an-unobtrusive-computerized-assessment-framework-for-unilateral-peripheral-facial-paralysis
#9
Zhe-Xiao Guo, Guo Dan, Jianghuai Xiang, Jun Wang, Wanzhang Yang, Huijun Ding, Oliver Deussen, Yongjin Zhou
Unilateral peripheral facial paralysis (UPFP) is a form of facial nerve paralysis and clinically classified according to conditions of facial symmetry. Prompt and precise assessment is crucial to neural rehabilitation of UPFP. The prevalent House-Brackmann (HB) grading system relies on subjective judgments with significant inter-observation variation. Therefore to explore an objective method for UPFP assessment, clinical image sequences are captured using a web camera setup while 5 healthy and 27 UPFP subjects performing a group of pre-defined actions, including keeping expressionless, raising brows, closing eyes, bulging cheek and showing teeth in turn...
May 24, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28541857/a-multidisciplinary-child-protection-team-improves-the-care-of-nonaccidental-trauma-patients
#10
John M Draus
We initiated a multidisciplinary Child Protection Team (CPT) as a subgroup of our pediatric multidisciplinary trauma peer review committee. Meetings are held monthly. Nonaccidental trauma (NAT) patients from the preceding month are reviewed. The meeting has two parts. During the open part, detectives and child protective services (CPS) workers are invited to discuss specific cases. The closed part focuses on improvement of specific processes and future outcomes. Attendance is recorded and minutes are kept. We sought to review accomplishments of this group...
May 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/28541813/video-analysis-verification-of-head-impact-events-measured-by-wearable-sensors
#11
Nelson Cortes, Andrew E Lincoln, Gregory D Myer, Lisa Hepburn, Michael Higgins, Margot Putukian, Shane V Caswell
BACKGROUND: Wearable sensors are increasingly used to quantify the frequency and magnitude of head impact events in multiple sports. There is a paucity of evidence that verifies head impact events recorded by wearable sensors. PURPOSE: To utilize video analysis to verify head impact events recorded by wearable sensors and describe the respective frequency and magnitude. STUDY DESIGN: Cohort study (diagnosis); Level of evidence, 2. METHODS: Thirty male (mean age, 16...
May 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28541084/the-feasibility-of-automated-eye-tracking-with-the-early-childhood-vigilance-test-of-attention-in-younger-hiv-exposed-ugandan-children
#12
Michael J Boivin, Jonathan Weiss, Ronak Chhaya, Victoria Seffren, Jorem Awadu, Alla Sikorskii, Bruno Giordani
OBJECTIVE: Tobii eye tracking was compared with webcam-based observer scoring on an animation viewing measure of attention (Early Childhood Vigilance Test; ECVT) to evaluate the feasibility of automating measurement and scoring. Outcomes from both scoring approaches were compared with the Mullen Scales of Early Learning (MSEL), Color-Object Association Test (COAT), and Behavior Rating Inventory of Executive Function for preschool children (BRIEF-P). METHOD: A total of 44 children 44 to 65 months of age were evaluated with the ECVT, COAT, MSEL, and BRIEF-P...
May 25, 2017: Neuropsychology
https://www.readbyqxmd.com/read/28538695/a-new-calibration-method-for-commercial-rgb-d-sensors
#13
Walid Darwish, Shenjun Tang, Wenbin Li, Wu Chen
Commercial RGB-D sensors such as Kinect and Structure Sensors have been widely used in the game industry, where geometric fidelity is not of utmost importance. For applications in which high quality 3D is required, i.e., 3D building models of centimeter‑level accuracy, accurate and reliable calibrations of these sensors are required. This paper presents a new model for calibrating the depth measurements of RGB-D sensors based on the structured light concept. Additionally, a new automatic method is proposed for the calibration of all RGB-D parameters, including internal calibration parameters for all cameras, the baseline between the infrared and RGB cameras, and the depth error model...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538655/thermochemical-humidity-detection-in-harsh-or-non-steady-environments
#14
Devon Bridgeman, Francis Tsow, Xiaojun Xian, Qinan Chang, Yongming Liu, Erica Forzani
We present a new method of chemical quantification utilizing thermal analysis for the detection of relative humidity. By measuring the temperature change of a hydrophilically-modified temperature sensing element vs. a hydrophobically-modified reference element, the total heat from chemical interactions in the sensing element can be measured and used to calculate a change in relative humidity. We have probed the concept by assuming constant temperature streams, and having constant reference humidity (~0% in this case)...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538310/enhancing-digital-video-analysis-of-bar-kinematics-in-weightlifting-a-case-study
#15
Torstein E Dæhlin, Tron Krosshaug, Loren Z F Chiu
Dæhlin, TE, Krosshaug, T, and Chiu, LZF. Enhancing digital video analysis of bar kinematics in weightlifting: a case study. J Strength Cond Res 31(6): 1592-1600, 2017-Weightlifting technique can be objectively assessed from two-dimensional video recordings. Despite its importance, participants' bar trajectories in research involving the snatch or clean exercises are often not reported, potentially due to the time required to digitize video. The purpose of this investigation was to evaluate the use of a light-emitting diode (LED)-based marker, digital video, and open-source software to automatically track the bar end during weightlifting exercises...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28538298/quantifying-the-high-speed-running-and-sprinting-profiles-of-elite-female-soccer-players-during-competitive-matches-using-an-optical-player-tracking-system
#16
Jocelyn K Mara, Kevin G Thompson, Kate L Pumpa, Stuart Morgan
Mara, JK, Thompson, KG, Pumpa, KL, and Morgan, S. Quantifying the high-speed running and sprinting profiles of elite female soccer players during competitive matches using an optical player tracking system. J Strength Cond Res 31(6): 1500-1508, 2017-The aim of this study was to determine the high-speed running and sprinting profiles of elite female soccer players during competitive matches using a new Optical Player Tracking system. Eight stationary video cameras were positioned at vantage points surrounding the soccer field so that when each camera view was combined, the entire field could be viewed simultaneously...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28537858/portable-equipment-for-taking-dramatic-sun-damage-revealing-photos-at-skin-cancer-prevention-outreach-events
#17
Jessica S Mounessa, Neil F Box, Nancy L Asdigian, Taylor Braunberger, Cory A Dunnick, Lori A Crane, Robert R Dellavalle
In recent years, appearance-based interventions have gained popularity as a means to improve public awareness about skin cancer and sun protective behaviors. Although numerous reports discuss the use of ultraviolet (UV) camera devices for this purpose,studies on the use of portable imaging devices in community outreach events do not presently exist. In this report, we discuss how we successfully utilize portable imaging devices at community outreach events. We also discuss the advantages and disadvantages of our portable devices in comparison to traditional UV cameras...
May 15, 2017: Dermatology Online Journal
https://www.readbyqxmd.com/read/28537510/remote-autopsy-services-a-feasibility-study-on-nine-cases
#18
Aleksandar Vodovnik, Mohammad Reza F Aghdam, Dan Gøran Espedal
Introduction We have conducted a feasibility study on remote autopsy services in order to increase the flexibility of the service with benefits for teaching and interdepartmental collaboration. Methods Three senior staff pathologists, one senior autopsy technician and one junior resident participated in the study. Nine autopsies were performed by the autopsy technician or resident, supervised by the primary pathologist, through the secure, double encrypted video link using Jabber Video (Cisco) with a high-speed broadband connection...
January 1, 2017: Journal of Telemedicine and Telecare
https://www.readbyqxmd.com/read/28535955/fracture-resistance-of-molar-teeth-with-mesial-occlusal-distal-mod-restorations
#19
Herzl Chai, Brian R Lawn
OBJECTIVE: Filled MOD restorations show near-complete recovery of tooth strength relative to the newly prepared, unfilled state. The present study examines the underlying mechanics of this recovery by more closely quantifying the mode of splitting fracture from the cavity base. By understanding the role of specific cavity dimensions on fracture resistance, useful clinical guidelines concerning MOD morphologies are formulated. METHODS: A systematic in vitro study is made of the load-bearing capacity of filled and unfilled MOD cavities by axially loading extracted molar teeth with a hard metal ball...
May 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28535414/gamma-radiography-and-tomography-with-a-ccd-camera-and-co-60-source
#20
Robert Adams, Robert Zboray
Gamma imaging using a relatively low strength 5.8mCi laboratory Co-60 source and a CsI(Tl) scintillator screen read out by a CCD camera was investigated. A simple model was used to estimate the effective count rate, which was verified with experiments. Radiography and tomography of phantoms were used to determine the test setup spatial resolution of about 1.3-2.5mm. Exposure times were on the order of a couple minutes per radiograph. These tests demonstrate the value of the count rate model and the feasibility of the setup as a simple and low-cost solution for gamma imaging cases where acquisition time is flexible and resolution requirements are moderate...
May 17, 2017: Applied Radiation and Isotopes
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