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Author: search.filters.author.Tosranon, P.Subject: search.filters.subject.Backprojection

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    Miniatured computed tomography system and calibration
    (2006-12-01)
    Pititheerapab, Y.
    ;
    Chanwimalueang, T.
    ;
    Pintavirooj, C.
    ;
    Tosranon, P.
    In this paper, we focus on a miniature computed tomographic system with application in 3D modelling of bony structure of a small animal. Our system consists of an x-ray source, a rotating platform and an x-ray array detector unit. The rotating platform is controlled by a personal computer which can rotate the sitting object to arbitrary angle. The x-ray array detector is used to capture the 2D x-ray signal that traversing the object placed on the platform. The x-ray detector is an image intensifier tube of which the 2D image is coupled to the computer via a CCD camera. Feldkamp Conebeam technique is engaged for reconstructing tomograms due to its simplicity. Volume rendering technique together with the shading effects is performed on a stack of cross-sectional image to realize the data into 3D visualization. The algorithms are applied to the practical situation where a series of x-ray radiographs of an animal's bone are collected from the system. The 3D modelling of such bone is performed on the cross-sectional images reconstructed with Feldkamp Conebeam. The results are very satisfactory. © 2006 IEEE.
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    3D modeling from radiograph with Conebeam geometry
    (2004-12-01)
    Kawikitwitcha, S.
    ;
    Pintavirooj, C.
    ;
    Tosranon, P.
    ;
    Kiriratnikbm, T.
    ;
    Anuntaseree, S.
    In order to render 3D model of the bone, the stack of cross-sectional images must be reconstructed from a series of X-ray radiographs, served as the projections. In the case where the distance between x-ray source and detector is not infinite, image reconstruction from projection based on parallel-beam geometry provides an error in the cross-sectional image. In such case, image reconstruction from projection based on conebeam geometry must be exercised instead. In this paper, the Simultaneous Algebraic Reconstruction Technique (SART Conebeam) is engaged for reconstructing tomograms in case of limited views of radiographs. Compared with Feldkamp Conebeam technique, the SART Conebeam theoretically gives the better quality of image for the same limited set of projections Volume rendering technique together with the shading effects is performed on a stack of cross-sectional image to realize the data into 3D visualization. The algorithms are applied to the practical situation where a series of x-ray radiographs of human femur bone are collected from a C-Arm x-ray apparatus. The 3D modeling of such bone is performed on the cross-sectional images reconstructed with SART conebeam. The results are very satisfactory. © 2004IEEE.