Results 51 to 60 of about 6,785,321 (317)

Experiment and Simulation of a Selective Subwavelength Filter with a Low Index Contrast

Nanomaterials, 2019
Subwavelength gratings have been of great interest recently due to their ability to eliminate multiple orders. However, high index contrast ( Δ n ∼ 3 ) is typically achieved using metals or high-index dielectrics surrounded by vacuum in ...
Tao Li, Mohamed Asbahii, Jian-Yee Lim, Hong Xie, Chan-Wai Koh, Min-Hao Goh, Kian-Soo Ong, Hang Zhang, Ding Ding   +8 more
doaj   +1 more source

Occipital Magnocellular VEP Non-linearities Show a Short Latency Interaction Between Contrast and Facial Emotion

Frontiers in Human Neuroscience, 2020
The magnocellular system has been implicated in the rapid processing of facial emotions, such as fear. Of the various anatomical possibilities, the retino-colliculo-pulvinar route to the amygdala is currently favored. However, it is not clear whether and
Eveline Mu, David Crewther
doaj   +1 more source

Spatial Frequency Discrimination of Band-limited Periodic Targets: Effects of Stimulus Contrast, Bandwidth and Retinal Eccentricity [PDF]

, 1992
Two experiments were conducted to explore the ability of human observers to discriminate the spatial frequency of briefly-presented, Gaussian-truncated sinewave gratings.
Greenlee, Mark W.
core   +1 more source

A computational relationship between thalamic sensory neural responses and contrast perception

Frontiers in Neural Circuits, 2015
Uncovering the relationship between sensory neural responses and perceptual decisions remains a fundamental problem in neuroscience. Decades of experimental and modeling work in the sensory cortex have demonstrated that a perceptual decision pool is ...
Yaoguang eJiang, Gopathy ePurushothaman, Vivien A Casagrande, Vivien A Casagrande, Vivien A Casagrande   +4 more
doaj   +1 more source

The functional role of contrast adaptation

, 1988
Prolonged inspection of high contrast sinewave gratings increases the contrast required to detect gratings having a similar spatial frequency and orientation. The functional role of such adaptation has, however, in the past, eluded disclosure.
Heitger, F., Greenlee, Mark W.
core   +1 more source

Multi-societal expert consensus statement on the safe administration of ultrasound contrast agents

Echo Research and Practice
Contrast enhanced ultrasound (CEUS) offers a safe, reliable imaging option to establish a clinical diagnosis across a variety of multidisciplinary settings.
Jordan B. Strom, Andrew Appis, Richard G. Barr, Maria Cristina Chammas, Dirk-André Clevert, Kassa Darge, Linda Feinstein, Steven B. Feinstein, J. Brian Fowlkes, Beverly Gorman, Pintong Huang, Yuko Kono, Juan Lopez-Mattei, Andrej Lyshchik, Michael L. Main, Wilson Matthias, Christina Merrill, Sharon L. Mulvagh, Petros Nihoyannopoulos, Joan Olson, Fabio Piscaglia, Thomas Porter, Arnaldo Rabischoffsky, Roxy Senior, Jessica L. Stout, Maria Stanczak, Stephanie R. Wilson, the International Contrast Ultrasound Society with endorsement from the British Society of Echocardiography, the Canadian Society of Echocardiography, the Society of Diagnostic Medical Sonography, the Society for Pediatric Radiology, the World Federation of Ultrasound in Medicine and Biology, the Brazilian College of Radiology, the Joint Review Committee for Diagnostic Medical Sonography, the Chinese Ultrasound Doctors Association, the American Society of Neuroimaging and affirmation/support from the American Society of Echocardiography , the Association for Medical Ultrasound, and the Society for Vascular Ultrasound   +36 more
doaj   +1 more source

Automatic image equalization and contrast enhancement using Gaussian mixture modeling [PDF]

, 2012
In this paper, we propose an adaptive image equalization algorithm that automatically enhances the contrast in an input image. The algorithm uses the Gaussian mixture model to model the image gray-level distribution, and the intersection points of the ...
Tjahjadi, Tardi, Turgay Celik, Tardi Tjahjadi, Çelik, Turgay   +3 more
core   +1 more source

Asymmetric direction selective filter elements based on high-contrast gratings

, 2022
Paper 86330ZWe present novel filter elements with an asymmetric angle dependent transmission based on high-contrast gratings. Asymmetric means a different efficiency for positive and negative incidence angles.
Fuchs, Jörg, Steiner, Stefan, Kley, Ernst-Bernhard, Voigt, Daniel, Tünnermann, Andreas, Kroker, Stefanie, Käsebier, Thomas, Fuchs, Frank   +7 more
core   +1 more source

Carcinomas and Carcinoid Tumors of the Lungs and Bronchi in Children and Adolescents: The EXPeRT Recommendations

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Primary lung carcinomas and bronchial carcinoid tumors (BC) are very rare malignancies in childhood. While typical BC and mucoepidermoid carcinomas are mostly low‐grade, localized tumors with a more favorable prognosis than in adults, necessitating avoidance of overtreatment, adenocarcinomas of the lung are often diagnosed at advanced disease ...
Michael Abele, Calogero Virgone, Michaela Kuhlen, Sabine Irtan, Yves Reguerre, Malgorzata Krawczyk, Ewa Bien, Tal Ben‐Ami, Maja Cesen, Ricardo Lopez‐Almaraz, Andrea Ferrari, Gianni Bisogno, Dominik T. Schneider, Abbas Agaimy, Constantin Lapa, Hubert Ducou le Pointe, Rainer Claus, Catherine Daniel, Ines B. Brecht, Daniel Orbach   +19 more
wiley   +1 more source

Peeling Plaids Apart: Context Counteracts Cross-Orientation Contrast Masking

, 2009
Background: Contrast discrimination for an image is usually harder if another image is superimposed on top. We asked whether such contrast masking may be enhanced or relieved depending on cues promoting integration of both images as a single pattern ...
Verghese, P., Preeti Verghese, Freeman, E, Verghese, P, Freeman, E. D., Elliot Freeman   +5 more
core   +1 more source