Isotropic versus anisotropic techniques in cardiac computed tomography images processing
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Fecha
2019
Autores
Barrera, D.
Valbuena, O.
Vera, M.
Huérfano, Y.
Gelvez, E.
Salazar, J.
Molina, V.
Sáenz, F.
Vera, M I.
Salazar, W.
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ISSN de la revista
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Editor
IOP Publishing
Resumen
The objective of the work is to compare the performance of two filters, one isotropic
and another one of anisotropic diffusion based on gradient. To do this, experiments are carried
out to establish which of the filters exhibits a better behavior against the imperfections that
characterize the computed tomography images. The structure of the experiments is as follows:
a) The parameters linked to the aforementioned filters are identified. b) The ranges of valuesof
these parameters and the way to use them are established. c) A database of three-dimensional
cardiac images is filtered by applying, independently, the aforementioned filters considering a
pre-established subset of values associated with the parameters. d) All the filtered images are
addressed by a segmentation process, based on the growth of regions, which allows extracting
the 3D morphology of the thoracic external aorta. e) As a metric to evaluate the performance of
each technique, the Jaccard similarity index (JSI) is used. f) The one that generates the lowest
calculated JSI is selected as the best technique when comparing a reference segmentation with
all generated segmentations. The results indicate that the anisotropic diffusion filter, based on a
gradient, obtained the best performance.
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Palabras clave
Computerized emission tomography, Transport theory, Cardiovascular system