Search results for "Coherence tomography"
showing 10 items of 150 documents
Supercontinuum optimization for dual-soliton based light sources using genetic algorithms in a grid platform
2014
We present a numerical strategy to design fiber based dual pulse light sources exhibiting two predefined spectral peaks in the anomalous group velocity dispersion regime. The frequency conversion is based on the soliton fission and soliton self-frequency shift occurring during super- continuum generation. The optimization process is carried out by a genetic algorithm that provides the optimum input pulse parameters: wavelength, temporal width and peak power. This algorithm is implemented in a Grid platform in order to take advantage of distributed computing. These results are useful for optical coherence tomography applications where bell-shaped pulses located in the second near-infrared wi…
Spatial Reconstruction Algorithm of DT Layer in Cryogenic Targets Using Optical Techniques
2007
The measurements of the solid DT layer, in terms of thickness and roughness, in the LMJ geometry (i.e. in a hohlraum) are not trivial. The DT layer measurements will be done using a Matsukov-Cassegrain telescope placed 39 cm away from the target. This telescope will be used to acquire shadowgraphy images on equators, and interferometric measurements on pole areas using optical coherence tomography (OCT). Optical coherence tomography allows determining the DT layer thickness on a few points, in the polar regions of the target. By scanning around the poles, several points can be acquired in order to calculate the roughness and the local shape of the DT layer at the pole. Both techniques were …
Differentiating Malignant from Benign Pigmented or Non-Pigmented Skin Tumours—A Pilot Study on 3D Hyperspectral Imaging of Complex Skin Surfaces and …
2022
Several optical imaging techniques have been developed to ease the burden of skin cancer disease on our health care system. Hyperspectral images can be used to identify biological tissues by their diffuse reflected spectra. In this second part of a three-phase pilot study, we used a novel hand-held SICSURFIS Spectral Imager with an adaptable field of view and target-wise selectable wavelength channels to provide detailed spectral and spatial data for lesions on complex surfaces. The hyperspectral images (33 wavelengths, 477–891 nm) provided photometric data through individually controlled illumination modules, enabling convolutional networks to utilise spectral, spatial, and skin-surface mo…
Optical coherence tomography in congenital hypertrophy of the retinal pigment epithelium.
2014
Relationship between peripapillary perfusion density, peripapillary flow index and traditional glaucoma measurements in open‐angle glaucoma and ocula…
2021
Macular capillary perfusion density and macular vessel density in open‐angle glaucoma and ocular hypertension: a quantitative study using optical coh…
2021
Use of Optical Coherence Tomography in Patients with Desquamative Gingivitis: A Case Series
2019
Validation of Optical Coherence Tomography in the assessment of Oral Potentially Malignant Disorders and Oral Cancer
Optical coherence tomography in oral medicine: preliminary in vivo study
2016
To introduce an OCT (Optical Coherence Tomography) in vivo database of oral diseases, by means of the VivoSight! OCT (Michelson diagnosis) scanner.
Optical coherence tomography as a simple and non invasive tool for the diagnosis of oral disease: a case report
2015
Introduction. Optical Coherence Tomography (OCT) is a new biomedical imaging modality that provides high reso- lution cross-sectional images of tissue. Conceptually, it has been compared with ultrasound scanning but it uses in- frared light and records reflections below the surface to produce a cross-sectional architectural image of the tissue. OCT has been applied in ophthalmology and recently in dermatology; several studies have shown the validity of the use of OCT in ex vivo oral lesions but, to date, it does not exist a bank of normative and pathological OCT data of the oral tissues to consent identification of cellular structures of normal and pathological processes. We report a case o…