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Author: search.filters.author.Pititheerapab, Y.

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    Bone mineral density and bone mineral content estimation using low-cost x-ray detector
    (2007-12-01)
    Chuaychunu, N.
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    Pititheerapab, Y.
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    Chanwimalueang, T.
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    Lertprasert, P.
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    Pintavirooj, C.
    This paper presented a design of a low-cost x-ray-detector using CMOS camera with an application on bone mineral content estimation. The main components consist of CMOS camera, optical lens, and image intensifier screen. CMOS camera offers various advantages including miniature-sized, low power consumption and cost effective. To apply the CMOS camera as x-ray detector, x-ray-to-visible light convector is required. Our key component of x-ray-to-visible light converter is intensifier screen. The application of x-ray detector for bone mineral density (BMD) and bone mineral content (BMC) is also given in this paper. The concept of dual energy x-ray is adopted to estimate the BMD on the finger bone. To compute BMC from BMD, the area of the bone is required. The concept of aative contour is applied to estimate the finger-bone area. ©2007 IEEE.
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    Miniatured computed tomography system and calibration
    (2006-12-01)
    Pititheerapab, Y.
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    Chanwimalueang, T.
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    Pintavirooj, C.
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    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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    X-ray -detector with CMOS sensor camera application of calcium denisty measurement
    (2006-12-01)
    Pititheerapab, Y.
    ;
    Chanmalueang, T.
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    Rerksngaem, T.
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    Kitipol, C.
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    Pintavirooj, C.
    This paper presented a design of an x-ray-detector using CMOS image sensor. The main components consist of CMOS sensor, taper fiber optic, and image intensifier screen, CMOS sensor offers various advantages including miniaturesized, low power consumption and cost effective. CMOS-based digital camera becomes hence very demanding due to its potential application in multimedia and information technology. To apply the CMOS sensor as x-ray detector, x-ray-to-visible light convector is required. Our key component of x-ray-tovisible light converter is an image intensifier screen mounted on the wider end of taper fiber optic. The narrow end of the taper fiber optic is coupled on the half-inch CMOS image sensor. In order to get higher image quality and system flexibility, more versatile CMOS image-sensor controller are preferable. Such complicate designs are made possible by the creation of entirely VHDL reconfiguration and programmable components- the socalled Field programmable Gate Array (FPGA). The designed x-ray-detector with CMOS sensor camera has been tested to capture a bony structure and ap-plied for calcium measurement. The result is very promising. © 2006 IEEE.