Results 21 to 30 of about 1,420,424 (313)

A High-precision Technique to Correct for Residual Atmospheric Dispersion in High-contrast Imaging Systems

Publications of the Astronomical Society of the Pacific, 2016
8 Pages, 10 figures, accepted to ...
Pathak, P., Guyon, O., Jovanovic, N., Lozi, J., Martinache, Frantz, Minowa, Y., Kudo, T., Takami, H., Hayano, Y., Narita, N.   +9 more
openaire   +3 more sources

Recurrence Quantification Analysis as a Post-processing Technique in Adaptive Optics High-contrast Imaging [PDF]

The Astrophysical Journal, 2018
Abstract In this work we explore the possibility of using recurrence quantification analysis (RQA) in astronomical high-contrast imaging to statistically discriminate the signal of faint objects from speckle noise. To this end, we tested RQA on a sequence of high frame rate (1 kHz) images acquired with the SHARK-VIS forerunner at the ...
M. Stangalini, G. Li Causi, F. Pedichini, S. Antoniucci, M. Mattioli, J. Christou, G. Consolini, D. Hope, S. M. Jefferies, R. Piazzesi, V. Testa   +10 more
openaire   +2 more sources

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

First light of the High Contrast Integral Field Spectrograph (HCIFS) [PDF]

, 2018
editorial reviewedFuture space-based observatories such as WFIRST will be equipped with high contrast imaging instruments designed to study extrasolar planets and disks in the absence of atmospheric perturbations.
Delacroix, Christian, Rizzo, Maxime, Christian Delacroix, Groff, Tyler, Galvin, Michael, Maxime Rizzo, Grossman, Matthew, Tyler D. Groff, Mary Anne Limbach, Sun, He, Kasdin, N. Jeremy, He Sun, Matthew Grossman, Michael Galvin, Mumm, Katherine, Jeremy Kasdin, Katherine Mumm, Limbach, Mary Anne   +17 more
core   +1 more source

REACT – A novel flow-independent non-gated non-contrast MR angiography technique using magnetization-prepared 3D non-balanced dual-echo dixon method: Preliminary clinical experience

European Journal of Radiology Open, 2020
Flow-independent relaxation-based non-contrast MR angiography techniques yield good signal-to-noise ratio and high blood-tissue contrast, complementing non-contrast flow-dependent and contrast-enhanced MR angiography techniques in the assessment of ...
Eu Jin Tan, Shuo Zhang, Prasanna Tirukonda, Le Roy Chong   +3 more
doaj   +1 more source

Minimizing contrast media dose in CT pulmonary angiography with high-pitch technique

The British Journal of Radiology, 2020
Objectives: To perform CT pulmonary angiography (CTPA) using a minimal amount of iodinated contrast media. Methods: 47 patients (25 females) with mean age 69 years (range 41–82 years) referred for contrast-enhanced chest CT were prospectively ...
Hanan Alobeidi, Muhammed Alshamari, Jonas Widell, Tomas Eriksson, Mats Lidén   +4 more
openaire   +2 more sources

Off-resonance magnetisation transfer contrast (MTC) MRI using fast field-cycling (FFC) [PDF]

, 2010
Peer ...
Lurie, David J, Choi, Chang-Hoon, Davies, Gareth R   +2 more
core   +1 more source

Image fusion for dynamic contrast enhanced magnetic resonance imaging

, 2004
Twellmann T, Saalbach A, Gerstung O, Leach MO, Nattkemper TW. Image fusion for dynamic contrast enhanced magnetic resonance imaging. Biomed Eng Online. 2004;3(1): 35.BACKGROUND: Multivariate imaging techniques such as dynamic contrast-enhanced magnetic ...
Nattkemper, Tim Wilhelm ; https://orcid.org/, Nattkemper Tim W, Saalbach, A, Olaf Gerstung, Gerstung, O., Leach, M.O., Twellmann Thorsten, Twellmann, Thorsten, Nattkemper, TW, Axel Saalbach, Tim W Nattkemper, Leach, Martin O, Gerstung Olaf, Twellmann, T Thorsten, Thorsten Twellmann, Gerstung, Olaf, Saalbach Axel, Saalbach, Axel, Leach Martin O, Gerstung, O, Nattkemper, T.W., Martin O Leach, Saalbach, A., Twellmann, T.   +23 more
core   +1 more source

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways [PDF]

, 2018
The Optimal Optical CoronagraphWorkshop at the Lorentz Center in September 2017 in Leiden, the Netherlands gathered a diverse group of 30 researchers working on exoplanet instrumentation to stimulate the emergence and sharing of new ideas.
Doelman, David, Baudoz, Pierre, Mazoyer, Johan, Kuhn, Jonas, Galicher, Raphaël, Riggs, A.J. Eldorado, Por, Emiel H., Cady, Eric, Ruane, Garreth, Carlomagno, Brunella, Carlotti, Alexis, Cvetojevic, Nick, Jewell, Jeffrey, Por, Emiel, Kuhn, Jonas G., Bendek, Eduardo, Norris, Barnaby, Haffert, Sebastiaan, Haffert, Sebastiaan Y., Beaulieu, Mathilde, Jovanovic, Nemanja, Miller, Kelsey, Fogarty, Kevin, Huby, Elsa, Ygouf, Marie, Sirbu, Dan, Riggs, A. J. Eldorado, Kenworthy, Matthew, Kenworthy, Matthew A., Snik, Frans, Pueyo, Laurent, Wilby, Michael, Doelman, David S., Wallace, J. Kent, Absil, Olivier, Keller, Christoph, Wallace, James K., Wallace, James,, Knight, Justin, N'Diaye, Mamadou, Guyon, Olivier, Wallace, James, R   +41 more
core   +1 more source

Evaluation of high-quality image reconstruction techniques applied to high-resolution Z-contrast imaging

Ultramicroscopy, 2017
High-quality image reconstruction techniques allow the generation of high pixel density images from a set of low-resolution micrographs. In general, these techniques consist of two main steps, namely, accurate registration, and formulation of an appropriate forward image model via some restoration method.
Barcena González, Guillermo, Guerrero Lebrero, María de la Paz, Guerrero Vázquez, Elisa, Yañez Escolano, Andrés, Fernández de los Reyes, Daniel, González Robledo, David, Galindo Riaño, Pedro Luis   +6 more
openaire   +3 more sources