Exploració per tema "Coherència (Òptica)"
Ara es mostren els items 1-20 de 20
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All-regions tunable high harmonic enhancement by a periodic static electric field
(American Institute of Physics (AIP), 2010-02-19)
Article
Accés obertSimulations show that a static electric field periodically distributed in space can be used to control the production of coherent light by high-order harmonic generation in a wide spectral range covering extremeultraviolet ... -
Análisis de la coherencia temporal en escenas dinámicas iluminadas con radiosidad
(1994-10-06)
Report de recerca
Accés obertEste report analiza los antecedentes existentes en el uso de la coherencia temporal para la aceleración del cálculo de secuencias de animación en escenas dinámicas iluminadas mediante radiosidad. La importancia de estas ... -
Asymmetry of retinal physiological measurements in young adults measured with optical coherence tomography
(Universitat Politècnica de Catalunya, 2014-06)
Projecte Final de Màster Oficial
Accés obertIntroduction: Optical coherence tomography (OCT) is a useful technique to assess the retina. In this study, we explored the physiological inter-ocular asymmetry of several retinal parameters in a sample of young Caucasian ... -
Averaging of collected-power fluctuations by a multiaperture receiver system
(SPIE-INT SOCIETY OPTICAL ENGINEERING, 1996-10-31)
Article
Accés obertWhen a large aperture is used to collect light propagated through the atmosphere, it performs an average operation on the irradiance fluctuations, resulting in collected-power fluctuations that are not as large as those ... -
Capacidad diagnóstica de dos métodos de cálculo basados en parámetros de OCT en glaucoma de tensión normal
(Universitat Politècnica de Catalunya, 2023-01-27)
Projecte Final de Màster Oficial
Accés restringit per política de l'editorialPropòsit. El diagnòstic del glaucoma de tensió normal (GNT), caracteritzat per valors de pressió intraocular inferiors a 21 mmHg, és complex, i es realitza habitualment mitjançant la mesura de la pressió intraocular, poc ... -
Estudi comparatiu de canvis estructurals i de perfusió vascular de la retina en pacients amb membrana epiretiniana operats de vitrectomia
(Universitat Politècnica de Catalunya, 2023-05-31)
Projecte Final de Màster Oficial
Accés obertPROPÒSIT: Avaluar els canvis en la morfologia i la microvasculatura abans i després de la cirurgia de vitrectomia en ulls amb membrana epiretiniana (MER) idiopàtica utilitzant angiografia de tomografia de coherència òptica ... -
Frequency-correlation requirements on the biphoton wave function in an induced-coherence experiment between separate sources
(American Physical Society, 2020-11-11)
Article
Accés obertThere is renewed interest in using the coherence between beams generated in separate down- converter sources for new applications in imaging, spectroscopy, microscopy and optical coherence tomography (OCT). These schemes ... -
Healing indicators after pterygium excision by optical coherence tomography
(2015-05-01)
Article
Accés obertPurposeTo establish the sequence of tomographic changes in the tissue recovery process after pterygium excision and to propose healing indicators.; MethodsOptical coherence tomography (OCT) images were taken at 1week, 1, ... -
Homodyne laser radar system for surface displacement monitoring
(SPIE-INT SOCIETY OPTICAL ENGINEERING, 2001-03-31)
Article
Accés obertA prototype of a homodyne laser radar system for surface displacement monitoring using the reference beam technique is presented. The prototype is very simple, is easy to align and focus, and is able to measure the velocity ... -
Optical coherence tomography with a nonlinear interferometer in the high parametric gain regime
(2020-08-31)
Article
Accés obertWe demonstrate optical coherence tomography based on an SU(1,1) nonlinear interferometer with high-gain parametric down-conversion. For imaging and sensing applications, this scheme promises to outperform previous experiments ... -
Optimization of a SS-OCT with a focus tunable lens for enhanced visualization of ocular opacities
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2019)
Comunicació de congrés
Accés restringit per política de l'editorialOptical methods have been recently used to perform objective assessment of crystalline lens and corneal opacities. Swept-source optical coherence tomography (SS-OCT) enables measurements of the back-reflected or back-scattered ... -
Reduction of foveal bulges and other anatomical changes in fellow eyes of patients with unilateral idiopathic macular hole without vitreomacular pathologic changes
(2017-08-23)
Article
Accés obertPurpose: To compare the foveal characteristics in fellow eyes (FE) of patients with unilateral idiopathic macular hole without vitreomacular pathologic changes with eyes of healthy controls. Methods: Forty-seven FE and 52 ... -
SAR interferometric coherence in wide band systems
(VSP BV, 2000-02-28)
Article
Accés obertThis paper presents a study of the interferometric coherence aimed to the understanding of the main sources of phase error of an operative wide band system. This objective is accomplished by finding a theoretical expression ... -
Uso de la OCT en casos de glaucomas secundarios
(Universitat Politècnica de Catalunya, 2019-01-10)
Treball Final de Grau
Accés obertLa tomografía de coherencia óptica (OCT), es una prueba de diagnostico por imagen, no invasiva que no requiere contacto ocular, y permite observar imágenes transversales por secciones de tejidos vivos del ojoentiempo ... -
Validez del ratio espesor del complejo de células ganglionares maculares respecto al espesor retiniano total en la detección del glaucoma en nuestro medio
(Universitat Politècnica de Catalunya, 2014-12-12)
Projecte Final de Màster Oficial
Accés obertEn la actualidad las pruebas anatómicas para el diagnóstico y seguimiento en glaucoma, cada vez tienen más relevancia en la práctica clínica. La utilización de la tomografía de coherencia óptica es básica en las consultas ... -
Variations of OCT measurements corrected for the magnification effect according to axial length and refractive error in children
(2018-01-02)
Article
Accés obertThe aim of this paper was to examine the distribution of macular, retinal nerve fiber layer (RNFL) thickness and optic disc parameters of myopic and hyperopic eyes in comparison with emmetropic control eyes and to investigate ... -
Visual and morphological characteristics in a pre-treated exudative Age-Related Macular Degeneration population
(Universitat Politècnica de Catalunya, 2017-06-22)
Projecte Final de Màster Oficial
Accés obertLa degeneració macular associada a l’edat (DMAE) és la principal causa de ceguesa legal en països desenvolupats. La DMAE exudativa, en la qual se centra aquest estudi, cursa amb neovascularització coroïdal originant una ... -
Whats biomarkers explain about pterygium OCT pattern
(2016-01-01)
Article
Accés obertBackground Optical coherence tomography (OCT) has become a very useful tool to study in vivo different ocular structures and to improve differential diagnosis and management of many ocular pathologies. This study aims ... -
Whole anterior segment and retinal swept source OCT for comprehensive ocular screening
(2021-03-01)
Article
Accés obertWhole eye visualization and morphometry are of high relevance in clinical practice. However, most standard ophthalmic OCT instruments are dedicated either to retinal or to anterior segment imaging. We demonstrate a swept ...