Image intensifier-based volume tomographic angiography imaging system: system evaluation

Ruola Ning; Xiaohui Wang; Jianjun Shen; Daofa Zhang; David L. Conover

doi:10.1117/12.237795

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11 April 1996 Image intensifier-based volume tomographic angiography imaging system: system evaluation

Ruola Ning, Xiaohui Wang, Jianjun Shen, Daofa Zhang, David L. Conover

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Proceedings Volume 2708, Medical Imaging 1996: Physics of Medical Imaging; (1996) https://doi.org/10.1117/12.237795
Event: Medical Imaging 1996, 1996, Newport Beach, CA, United States

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.

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Ruola Ning, Xiaohui Wang, Jianjun Shen, Daofa Zhang, and David L. Conover "Image intensifier-based volume tomographic angiography imaging system: system evaluation", Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); https://doi.org/10.1117/12.237795

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