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https://www.readbyqxmd.com/read/28430540/demystifying-orbital-emergencies-a-pictorial-review
#1
Viet D Nguyen, Achint K Singh, Wilson B Altmeyer, Bundhit Tantiwongkosi
Imaging of the orbit plays an important role in the workup of orbital emergencies. Orbital imaging is particularly useful in the emergency department, where clinical history and physical examination may be limited or delayed until the exclusion or treatment of more life-threatening conditions. Cross-sectional orbital imaging with multidetector computed tomography (CT) and magnetic resonance (MR) imaging is commonly performed in addition to ultrasonography. In an emergent setting, CT is the preferred modality when evaluating for intraorbital foreign bodies, fractures, or calcifications within a mass lesion...
April 21, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28425947/deep-count-fruit-counting-based-on-deep-simulated-learning
#2
Maryam Rahnemoonfar, Clay Sheppard
Recent years have witnessed significant advancement in computer vision research based on deep learning. Success of these tasks largely depends on the availability of a large amount of training samples. Labeling the training samples is an expensive process. In this paper, we present a simulated deep convolutional neural network for yield estimation. Knowing the exact number of fruits, flowers, and trees helps farmers to make better decisions on cultivation practices, plant disease prevention, and the size of harvest labor force...
April 20, 2017: Sensors
https://www.readbyqxmd.com/read/28422669/bioinspired-approach-to-modeling-retinal-ganglion-cells-using-system-identification-techniques
#3
Philip J Vance, Gautham P Das, Dermot Kerr, Sonya A Coleman, T Martin McGinnity, Tim Gollisch, Jian K Liu
The processing capabilities of biological vision systems are still vastly superior to artificial vision, even though this has been an active area of research for over half a century. Current artificial vision techniques integrate many insights from biology yet they remain far-off the capabilities of animals and humans in terms of speed, power, and performance. A key aspect to modeling the human visual system is the ability to accurately model the behavior and computation within the retina. In particular, we focus on modeling the retinal ganglion cells (RGCs) as they convey the accumulated data of real world images as action potentials onto the visual cortex via the optic nerve...
April 12, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28420134/visual-detection-and-tracking-system-for-a-spherical-amphibious-robot
#4
Shuxiang Guo, Shaowu Pan, Liwei Shi, Ping Guo, Yanlin He, Kun Tang
With the goal of supporting close-range observation tasks of a spherical amphibious robot, such as ecological observations and intelligent surveillance, a moving target detection and tracking system was designed and implemented in this study. Given the restrictions presented by the amphibious environment and the small-sized spherical amphibious robot, an industrial camera and vision algorithms using adaptive appearance models were adopted to construct the proposed system. To handle the problem of light scattering and absorption in the underwater environment, the multi-scale retinex with color restoration algorithm was used for image enhancement...
April 15, 2017: Sensors
https://www.readbyqxmd.com/read/28419484/variations-in-the-functional-visual-field-for-detection-of-lung-nodules-on-chest-computed-tomography-impact-of-nodule-size-distance-and-local-lung-complexity
#5
Lukas Ebner, Martin Tall, Kingshuk Roy Choudhury, Donald L Ly, Justus E Roos, Sandy Napel, Geoffrey D Rubin
PURPOSE: To explore the characteristics that impact lung nodule detection by peripheral vision when searching for lung nodules on chest CT-scans. METHODS: This study was approved by the local IRB and HIPAA compliant. A simulated primary (1°) target mass (2 x 2 x 5 cm) was embedded into 5-cm thick sub-volumes (SV) extracted from three unenhanced lung MDCT-scans (64-row, 1.25 mm thickness, 0.7 mm increment). One of 30 solid, secondary nodules with either 3-4 mm and 5-8 mm diameters were embedded into 192 of 207 SVs...
April 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28413540/intraventricular-glioblastoma-multiforme-mimicking-meningioma-and-review-of-the-literature
#6
Ashis Patnaik, Sudhansu S Mishra, Satya B Senapati
Glioblastoma multiforme (GBM) is the most common primary brain tumor and is usually found in aged persons in the cerebral hemispheres particularly the frontotemporal region. But intraventricular GBM is rare and only few cases have been reported in the literature. We report a case of a 27-year-old man who presented with headache, vision loss in both eyes, and other signs and symptoms of increased intracranial pressure. Computed tomography and magnetic resonance imaging showed an intraventricular, well-circumscribed lesion with homogeneous enhancement of contrast, suggestive of meningioma that is more common than GBM in this location...
January 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/28411334/normative-values-for-a-tablet-computer-based-application-to-assess-chromatic-contrast-sensitivity
#7
Lakshmi Bodduluri, Mei Ying Boon, Malcolm Ryan, Stephen J Dain
Tablet computer displays are amenable for the development of vision tests in a portable form. Assessing color vision using an easily accessible and portable test may help in the self-monitoring of vision-related changes in ocular/systemic conditions and assist in the early detection of disease processes. Tablet computer-based games were developed with different levels of gamification as a more portable option to assess chromatic contrast sensitivity. Game 1 was designed as a clinical version with no gaming elements...
April 14, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28410105/dynamic-textures-modeling-via-joint-video-dictionary-learning
#8
Xian Wei, Yuanxiang Li, Hao Shen, Fang Chen, Martin Kleinsteuber, Zhongfeng Wang
Video representation is an important and challenging task in the computer vision community. In this paper, we consider the problem of modeling and classifying video sequences of dynamic scenes which could be modeled in a dynamic textures (DT) framework. At first, we assume that image frames of a moving scene can be modeled as a Markov random process. We propose a sparse coding framework, named joint video dictionary learning (JVDL), to model a video adaptively. By treating the sparse coefficients of image frames over a learned dictionary as the underlying "states", we learn an efficient and robust linear transition matrix between two adjacent frames of sparse events in time series...
April 6, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28407514/age-estimation-from-structural-changes-of-teeth-and-buccal-alveolar-bone-level
#9
K K Koh, J S Tan, P Nambiar, Norliza Ibrahim, Sunil Mutalik, Muhammad Khan Asif
Forensic odontology plays a vital role in the identification and age estimation of unknown deceased individuals. The purpose of this study is to estimate the chronological age from Cone-Beam Computed Tomography (CBCT) images by measuring the buccal alveolar bone level (ABL) to the cemento-enamel junction and to investigate the possibility of employing the age-related structural changes of teeth as studied by Gustafson. In addition, this study will determine the forensic reliability of employing CBCT images as a technique for dental age estimation...
April 1, 2017: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/28406471/real-time-vision-based-road-sign-recognition-using-an-artificial-neural-network
#10
Kh Tohidul Islam, Ram Gopal Raj
Road sign recognition is a driver support function that can be used to notify and warn the driver by showing the restrictions that may be effective on the current stretch of road. Examples for such regulations are 'traffic light ahead' or 'pedestrian crossing' indications. The present investigation targets the recognition of Malaysian road and traffic signs in real-time. Real-time video is taken by a digital camera from a moving vehicle and real world road signs are then extracted using vision-only information...
April 13, 2017: Sensors
https://www.readbyqxmd.com/read/28405486/rare-clinical-sign-of-hodgkin-s-lymphoma-ocular-involvement
#11
Ziya Ayhan, Revan Yıldırım Karabağ, İnci Alacacıoğlu, Süleyman Kaynak, Nilüfer Koçak
Bilateral non-granulomatous anterior uveitis with left vitritis and macular edema were detected in a 19-year-old woman presenting with blurred vision in her left eye. Light microscopic study of the pathologic mediastinal lymph node that was detected via contrast computed tomography imaging during etiologic study revealed nodular sclerosing and mixed cellularity Hodgkin's lymphoma (HL). Ocular findings completely resolved with adriablastin, bleomycin, vinblastine, dacarbazine chemotherapy treatment. Herein, it is emphasized that HL should be remembered as one of the differential diagnoses in patients with ocular inflammatory pathologies such as uveitis and vasculitis...
April 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28405168/the-black-evil-affecting-patients-with-diabetes-a-case-of-rhino-orbito-cerebral-mucormycosis-causing-garcin-syndrome
#12
Santhosh Narayanan, Geetha Panarkandy, Gomathy Subramaniam, Chandni Radhakrishnan, N K Thulaseedharan, Neeraj Manikath, Sreejith Ramaswamy, Suma Radhakrishnan, Danish Ekkalayil
Mucormycosis is a life-threatening infection affecting patients with diabetes. It is an angioinvasive disease often resistant to treatment with a debilitating course and high mortality. Here, we report a case of a 45 year old woman with type 2 diabetes mellitus who presented to us with history of right-sided ptosis and facial palsy, and subsequently developed loss of vision and palatal palsy. She was in diabetic ketoacidosis. Nervous system examination revealed involvement of right second, third, fourth, sixth, seventh, ninth, and tenth cranial nerves, suggestive of Garcin syndrome...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28399632/predicting-binding-free-energies
#13
David L Mobley, Michael K Gilson
Binding free energy calculations based on molecular simulations provide predicted affinities for biomolecular complexes. These calculations begin with a detailed description of a system, including its chemical composition and the interactions among its components. Simulations of the system are then used to compute thermodynamic information, such as binding affinities. Because of their promise for guiding molecular design, these calculations have recently begun to see widespread applications in early-stage drug discovery...
April 7, 2017: Annual Review of Biophysics
https://www.readbyqxmd.com/read/28398230/integrating-spherical-panoramas-and-maps-for-visualization-of-cultural-heritage-objects-using-virtual-reality-technology
#14
Mila Koeva, Mila Luleva, Plamen Maldjanski
Development and virtual representation of 3D models of Cultural Heritage (CH) objects has triggered great interest over the past decade. The main reason for this is the rapid development in the fields of photogrammetry and remote sensing, laser scanning, and computer vision. The advantages of using 3D models for restoration, preservation, and documentation of valuable historical and architectural objects have been numerously demonstrated by scientists in the field. Moreover, 3D model visualization in virtual reality has been recognized as an efficient, fast, and easy way of representing a variety of objects worldwide for present-day users, who have stringent requirements and high expectations...
April 11, 2017: Sensors
https://www.readbyqxmd.com/read/28397758/a-multi-sensorial-simultaneous-localization-and-mapping-slam-system-for-low-cost-micro-aerial-vehicles-in-gps-denied-environments
#15
Elena López, Sergio García, Rafael Barea, Luis M Bergasa, Eduardo J Molinos, Roberto Arroyo, Eduardo Romera, Samuel Pardo
One of the main challenges of aerial robots navigation in indoor or GPS-denied environments is position estimation using only the available onboard sensors. This paper presents a Simultaneous Localization and Mapping (SLAM) system that remotely calculates the pose and environment map of different low-cost commercial aerial platforms, whose onboard computing capacity is usually limited. The proposed system adapts to the sensory configuration of the aerial robot, by integrating different state-of-the art SLAM methods based on vision, laser and/or inertial measurements using an Extended Kalman Filter (EKF)...
April 8, 2017: Sensors
https://www.readbyqxmd.com/read/28397111/gaze-contingent-perceptually-enabled-interactions-in-the-operating-theatre
#16
Alexandros A Kogkas, Ara Darzi, George P Mylonas
PURPOSE: Improved surgical outcome and patient safety in the operating theatre are constant challenges. We hypothesise that a framework that collects and utilises information -especially perceptually enabled ones-from multiple sources, could help to meet the above goals. This paper presents some core functionalities of a wider low-cost framework under development that allows perceptually enabled interaction within the surgical environment. METHODS: The synergy of wearable eye-tracking and advanced computer vision methodologies, such as SLAM, is exploited...
April 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28392672/shape-analysis-with-hyperbolic-wasserstein-distance
#17
Jie Shi, Wen Zhang, Yalin Wang
Shape space is an active research field in computer vision study. The shape distance defined in a shape space may provide a simple and refined index to represent a unique shape. Wasserstein distance defines a Riemannian metric for the Wasserstein space. It intrinsically measures the similarities between shapes and is robust to image noise. Thus it has the potential for the 3D shape indexing and classification research. While the algorithms for computing Wasserstein distance have been extensively studied, most of them only work for genus-0 surfaces...
June 2016: Proceedings
https://www.readbyqxmd.com/read/28391822/a-novel-method-and-software-for-automatically-classifying-alzheimer-s-disease-patients-by-magnetic-resonance-imaging-analysis
#18
F Previtali, P Bertolazzi, G Felici, E Weitschek
BACKGROUND AND OBJECTIVE: The cause of the Alzheimer's disease is poorly understood and to date no treatment to stop or reverse its progression has been discovered. In developed countries, the Alzheimer's disease is one of the most financially costly diseases due to the requirement of continuous treatments as well as the need of assistance or supervision with the most cognitively demanding activities as time goes by. The objective of this work is to present an automated approach for classifying the Alzheimer's disease from magnetic resonance imaging (MRI) patient brain scans...
May 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28391814/antibiogramj-a-tool-for-analysing-images-from-disk-diffusion-tests
#19
C A Alonso, C Domínguez, J Heras, E Mata, V Pascual, C Torres, M Zarazaga
BACKGROUND AND OBJECTIVES: Disk diffusion testing, known as antibiogram, is widely applied in microbiology to determine the antimicrobial susceptibility of microorganisms. The measurement of the diameter of the zone of growth inhibition of microorganisms around the antimicrobial disks in the antibiogram is frequently performed manually by specialists using a ruler. This is a time-consuming and error-prone task that might be simplified using automated or semi-automated inhibition zone readers...
May 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28391813/a-pc-based-shutter-glasses-controller-for-visual-stimulation-using-multithreading-in-labwindows-cvi
#20
Ivan Gramatikov, Kurt Simons, David Guyton, Boris Gramatikov
BACKGROUND AND OBJECTIVES: Amblyopia, commonly known as "lazy eye," is poor vision in an eye from prolonged neurologic suppression. It is a major public health problem, afflicting up to 3.6% of children, and will lead to lifelong visual impairment if not identified and treated in early childhood. Traditional treatment methods, such as occluding or penalizing the good eye with eye patches or blurring eye drops, do not always yield satisfactory results. Newer methods have emerged, based on liquid crystal shutter glasses that intermittently occlude the better eye, or alternately occlude the two eyes, thus stimulating vision in the "lazy" eye...
May 2017: Computer Methods and Programs in Biomedicine
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