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Proceedings Paper

Image intensifier-based volume tomographic angiography imaging system: system evaluation
Author(s): Ruola Ning; Xiaohui Wang; Jianjun Shen; Daofa Zhang; David L. Conover
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Paper Abstract

An image intensifier-based rotational volume tomographic angiography imaging system has been constructed. The system consists of an x-ray tube and an image intensifier that are separately mounted on a gantry. This system uses an image intensifier coupled to a charge coupled device (CCD) camera as a two-dimensional detector so that a set of two-dimensional projections can be acquired for a direct three-dimensional reconstruction (3D). A computer simulation has been performed to quantify the reconstruction error due to using 'a single circle cone beam geometry.' The results from the computer simulation indicate that the reconstruction error is relatively small compared to object contrast encountered in intra- arterial angiography. In this study, a scatter and veiling glare correction technique is reported. This technique put a beam stop array behind a phantom and in front of the image intensifier to estimate the scatter and veiling glare distribution. Then the primary beam distribution was estimated by subtracting the scatter and veiling glare distribution from the total detected radiation distribution. After obtaining the primary projections, a direct 3D reconstruction was obtained. The experimental results indicate that image contrast can be substantially improved by applying our scatter and veiling glare correction technique.

Paper Details

Date Published: 11 April 1996
PDF: 12 pages
Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); doi: 10.1117/12.237795
Show Author Affiliations
Ruola Ning, Univ. of Rochester Medical Ctr. (United States)
Xiaohui Wang, Univ. of Rochester Medical Ctr. (United States)
Jianjun Shen, Univ. of Rochester Medical Ctr. (United States)
Daofa Zhang, Univ. of Rochester Medical Ctr. (United States)
David L. Conover, Univ. of Rochester Medical Ctr. (United States)


Published in SPIE Proceedings Vol. 2708:
Medical Imaging 1996: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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