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Brain tissue segmentation using q-entropy in multiple sclerosis magnetic resonance images BJMBR
Diniz,P.R.B.; Murta-Junior,L.O.; Brum,D.G.; de Araújo,D.B.; Santos,A.C..
The loss of brain volume has been used as a marker of tissue destruction and can be used as an index of the progression of neurodegenerative diseases, such as multiple sclerosis. In the present study, we tested a new method for tissue segmentation based on pixel intensity threshold using generalized Tsallis entropy to determine a statistical segmentation parameter for each single class of brain tissue. We compared the performance of this method using a range of different q parameters and found a different optimal q parameter for white matter, gray matter, and cerebrospinal fluid. Our results support the conclusion that the differences in structural correlations and scale invariant similarities present in each tissue class can be accessed by generalized...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Multiple sclerosis; Automatic segmentation; Magnetic resonance image; Volumetry; Tsallis entropy.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000100011
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Superparamagnetic Poly (3-hydroxybutyrate-co-3 hydroxyvalerate) (PHBV) nanoparticles for biomedical applications Electron. J. Biotechnol.
Vilos,Cristian; Gutiérrez,Marlen; Escobar,Roberto A; Morales,Francisco; Denardin,Juliano C; Velasquez,Luis; Altbir,Dora.
Background: The progress in material science and the recent advances in biodegradable/biocompatible polymers and magnetic iron oxide nanoparticles have led to develop innovative diagnostic and therapeutic strategies for diseases based on multifunctional nanoparticles, which include contrast medium for magnetic resonance imaging, agent for hyperthermia and nanocarriers for targeted drug delivery. The aim of this work is to synthesize and characterize superparamagnetic iron oxide (magnetite), and to encapsulate them into poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanoparticles for biomedical applications. Results: The magnetite nanoparticles were confirmed by X-ray diffraction and exhibited a size of 22.3 ± 8.8 nm measured by transmission electron...
Tipo: Journal article Palavras-chave: Hyperthermia; Magnetic resonance image; Magnetite; PHBV; Polymeric nanoparticles.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500008
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Characterizing and modeling preferential flow using magnetic resonance imaging and multifractal theory. Infoteca-e
POSADAS, A.; CRESTANA, S.; ONODY, R. N.; QUIROZ, R.; TANUS, A.; PANEPUCCI, C. H..
Tipo: Folhetos Palavras-chave: Multifractal; Magnetic resonance image; Soil.
Ano: 2007 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/906935
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