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Using Graphics Processing Units to Parallelize the FDK Algorithm for Tomographic Image Reconstruction

Journal of Chemistry and Chemical Engineering 2012年第8期6卷 760-768页

作者： joel sancnchez dominguez Luiz Femando de Oliveira Nilton Alves Junior Joaquim Teixeira de Assis Politechnical Institute of Rio de Janeiro State University Nova Friburgo-RJ 28625-570 Brazil Physics Institute of Rio de Janeiro State University Rio de Janeiro 20550-900 Brazil Brazilian center for physical research Rio de Janeiro 22290-180 Brazil

The paper presents the implementation of a parallel version of FDK （Felkamp, David e Kress） algorithm using graphics processing units. Discussion was briefly some elements the computed tomographic scan and FDK algorithm; and some ideas about GPUs （Graphics Processing Units） and its use in general purpose computing were presented. The paper shows a computational implementation of FDK algorithm and the process of parallelization of this implementation. Compare the parallel version of the algorithm with the sequential version, used speedup as a performance metric. To evaluate the performance of parallel version, two GPUs, GeForce 9400GT （16 cores） a low capacity GPU and Quadro 2000 （192 cores） a medium capacity GPU was reached speedup of 3.37.

关键词： Computed tomography images reconstruction FDK algorithm GPUs CUDA-C parallel processing.

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Comparison of the Internal Structures of Bones by Microtomography

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Journal of Chemistry and Chemical Engineering 2017年第2期11卷 51-54页

作者： Julio Cesar Latini Stutz joel. Sanchez dominguez Joaquim Teixeira de Assis DEMEC/LEFI/IPRJ Universidade do Estado do Rio de Janeiro 28625-570 Nova Friburgo-RJ Brazil Universidade Estacio de Sa Nova Friburgo Rio de Janeiro Brazil

The use of computed microtomography （***） has revolutionized many areas of research, such as noninvasive, fast and high precision techniques, which allows immediate visualization of internal structures without any risk to the object of study. ~tCT is widely accepted for medical diagnostics, is also important for purposes of zoological research and paleontological. In this work, we used the μCT to investigate the internal structure of bones from mammalian and poultry. We studied the bones of rats and quail. Through microtomography images, we observed that the bones of the poultry have a bony structure in the form of a trellis that is not present in bones of mammals. These trellises bony is an evolutionary adaptation that allowed the bones of the birds to become longer and lighter maintaining its strength. It was also observed that the percentage of the trabecular area in poultry is almost half of that observed in mammals. The results obtained validate the use of μCT as a technique that allows the study of bone structures in small samples, enabling to explore the morphological differences between the bones of those species.

关键词： Microtomography bones X-ray.

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Obtaining Porosity of Concrete Using X-ray Microtomography or Digital Scanner

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Journal of Chemistry and Chemical Engineering 2014年第4期8卷 371-377页

作者： Jose Renato de Castro Pessoa joel Sanchez dominguez Gil de Carvalho Joaquim Teixeira de Assis Politechnical Institute of Rio de Janeiro State University Nova Friburgo 28625-570 Brazil

The aim of this work is to determine the porosity of concrete by means of two NDT （non-destructive testing） using digital images. In one test, the images were obtained through X-ray microtomography and for another test via digital scanner. In both of the tests, the images were processed using techniques of mathematical morphology and pixel processing. For both NDT, it was used concrete samples with 20-30 MPa of compressive strength. The results for the porosity were compared with results obtained by the standard test proposed by NBR （Norma Brasileira） 9778 （2005） showing the compatibility between two studied methods and pattern method.

关键词： Concrete porosity X-ray microtomographic images processing matematical morfology.

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Calculation of Percentage of Coarse Aggregate Present in Concrete Using Processing of Digital Images Obtained with a Commercial Scanner

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Journal of Chemistry and Chemical Engineering 2015年第2期9卷 136-139页

作者： Jose Renato de Castro Pessoa joel Sanchez dominguez Rodrigo Erthal Wilson Vanussa da Silva Charles Gil de Carvalho Joaquim Teixeira de Assis Politechnical Institute of Rio de Janeiro State University Nova Friburgo 28625-570 Brazil Estacio de Sa University Nova Friburgo 28611-135 Brazil Federal Fluminense University Itaocara 28470-000 Brazil

This paper presents a method for determining the percentage of coarse aggregate in concrete specimens by image processing. The test pieces were produced with the aim of obtaining images of their cross sections through a scanner table. In order to increase the contrast between mortar and coarse aggregate the sliced surfaces were treated with the phenolphthale in solution. The images obtained in the scanner were processed in a program developed with MATLAB （matrix laboratory）. The average coarse aggregate in each section and the mean of coarse aggregate per test body were calculated. With the results, it was revealed that the method returned satisfying results when compared to the original trace of the concrete.

关键词： Concrete image processing characterization of concrete.

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