Výsledky vyhledávání - "Maria Ines Silvani"

On the Richardson-Lucy Algorithm with A Varying Point Spread Function along The Iterations

Autor: Erica S. Souza, Maria Ines Silvani, Gevaldo L. Almeida, Ricardo T. Lopes

Publikováno v: International Journal of Image Processing and Vision Science. :105-113

This work analyses the soundness of two algorithms, Fishsint and Almexp to improve images using the Richardson-Lucy (RL) algorithm under a varying Point Spread Function (PSF) along the iterations. A plethora of methods based on Richardson-Lucy has be

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f333f1a7a4dc2523cbd6fa063eab5b6
https://doi.org/10.47893/ijipvs.2022.1082

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Determination of a neutron beam divergence after the rocking curve concept using Richardson–Lucy’s unfolding algorithm

Autor: Gevaldo L. de Almeida, Maria Ines Silvani, E.S. Souza, Ricardo Tadeu Lopes

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 908:172-181

Thermal neutron radiographs acquired under high beam divergences suffer the impact of intense penumbrae degrading their final quality. As a divergence reduction is not always feasible, one possible alternative is an a posteriori treatment to restore

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::80ea330ecdeb7e8a4f456d36efa2a8ff
https://doi.org/10.1016/j.nima.2018.08.055

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Reducing the spatial resolution range of neutron radiographs cast by thick objects

Autor: Maria Ines Silvani, Gevaldo L. de Almeida, E.S. Souza, Ricardo Tadeu Lopes

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 871:127-134

The quality of a neutron radiograph is strongly dependent upon the features of the acquisition system. Most of them, such as detector resolution, electronic noise and statistical fluctuation can hardly be improved. Yet, a main parameter ruling the im

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::df4b31fcc2675e9a7232273c141ebdb7
https://doi.org/10.1016/j.nima.2017.07.055

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Stereoscopic radiographic images with thermal neutrons

Autor: Gevaldo L. de Almeida, Maria Ines Silvani, Ricardo Tadeu Lopes, J.D. Rogers

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 652:634-637

Spatial structure of an object can be perceived by the stereoscopic vision provided by eyes or by the parallax produced by movement of the object with regard to the observer. For an opaque object, a technique to render it transparent should be used,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::88b1615210139f6e425f0637d2ebbbbe
https://doi.org/10.1016/j.nima.2010.09.051

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A Novel Approach to Assess the Spatial Resolution of Position Sensitive Detectors Equipping 2D Neutron Tomographic Systems

Autor: Maria Ines Silvani, Ricardo Tadeu Lopes, G.L. de Almeida

Publikováno v: IEEE Transactions on Nuclear Science. 56:2280-2283

Tomographic systems have their performance deeply affected by the finite spatial resolution of the detectors equipping them. It is therefore very important to measure it, making thus possible to forecast-by using of a proper simulator-the potential i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5e68497840c2093908bd194fadc4d646
https://doi.org/10.1109/tns.2009.2024744

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On the impact of neutron beam divergence and scattering on the quality of transmission acquired tomographic images

Autor: Rosanne C. A. A. Furieri, Marcelo J. Gonçalves, Ricardo Tadeu Lopes, Maria Ines Silvani, Gevaldo L. de Almeida

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 263:253-257

The impact of the divergence of a thermal neutron beam and the scattered neutrons on the quality of tomographic images acquired by transmission have been evaluated by using a third generation tomographic system incorporating neutron collimators under

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ed3cc7a13715ed48a7cd0485d6a7bf9a
https://doi.org/10.1016/j.nimb.2007.04.237

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Forecasting the effect of neutron beam divergence on the quality of tomographic images

Autor: Ricardo Tadeu Lopes, G.L. de Almeida, Maria Ines Silvani, Marcelo J. Gonçalves, Rosane Cefaly A.A. Furieri

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 579:231-234

The impact of the divergence of a neutron beam emitted by a surface source on the quality of 2D tomographic images has been assessed through a computer code specially written for this purpose. It generates position spectra used as projections for the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::84af324c4221dd168bcf1069e155d268
https://doi.org/10.1016/j.nima.2007.04.046

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Development of a simulator for tomographic images generated by radiation transmission

Autor: Rosanne C. A. A. Furieri, Maria Ines Silvani, Gevaldo L. de Almeida, Ricardo Tadeu Lopes, Marcelo J. Gonçalves

Publikováno v: Brazilian Journal of Physics, Volume: 34, Issue: 3a, Pages: 767-772, Published: SEP 2004
Brazilian Journal of Physics v.34 n.3a 2004
Brazilian Journal of Physics
Sociedade Brasileira de Física (SBF)
instacron:SBF

A computer program to simulate tomographic images generated by transmitted radiation was developed. The algorithm uses a deterministic approach to generate the projections, which supply an existing image reconstruction software. A dispersion associat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f36597f67c134dde617ae33abebddf9
https://doi.org/10.1590/s0103-97332004000500016

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Conversion of a X-ray position sensitive detector for use in a thermal neutron tomographic system

Autor: Maria Ines Silvani, Ademarlaudo F. Barbosa, Ricardo Tadeu Lopes, Gevaldo L. de Almeida, Delson Braz, Edgar Francisco Oliveira de Jesus

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 213:294-299

A gaseous position sensitive detector originally designed to operate with X-rays has been modified for using in thermal neutron tomographic systems. This modification included the replacing of the standard argon–methane mixture by 3He-enriched heli

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a732132482ab3d51d4221ab1dbc0e2a6
https://doi.org/10.1016/s0168-583x(03)01621-5

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Comparison of tomographic systems for X-ray and thermal neutrons

Autor: Maria Ines Silvani Souza, Rosanne C. A. A. Furieri, Edgar Oliveira de Jesus, Ademarlaudo F. Barbosa, Gevaldo L. de Almeida, Ricardo Tadeu Lopes

Publikováno v: Brazilian Journal of Physics v.33 n.2 2003
Brazilian Journal of Physics
Sociedade Brasileira de Física (SBF)
instacron:SBF
Brazilian Journal of Physics, Volume: 33, Issue: 2, Pages: 286-290, Published: JUN 2003

In this work, tomographic images of the same object have been taken with 25 keV X-rays and thermal neutrons (E=0.025 eV) aiming to demonstrate that thermal neutron tomography in some cases is a complementary technique to the X-ray tomography, such as

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b123ef27d23053cad19bb218181d4eb2
https://doi.org/10.1590/s0103-97332003000200023

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