28 June 2001 X-ray flat-panel imager (FPI)-based cone-beam volume CT (CBVCT) under a circle-plus-two-arc data acquisition orbit
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Abstract
The potential of cone beam volume CT (CBVCT) to improve the data acquisition efficiency for volume tomographic imaging is well recognized. A novel x-ray FPI based CBVCT prototype and its preliminary performance evaluation are presented in this paper. To meet the data sufficiency condition, the CBVCT prototype employs a circle-plus-two-arc orbit accomplished by a tiltable circular gantry. A cone beam filtered back-projection (CB-FBP) algorithm is derived for this data acquisition orbit, which employs a window function in the Radon domain to exclude the redundancy between the Radon information obtained from the circular cone beam (CB) data and that from the arc CB data. The number of projection images along the circular sub-orbit and each arc sub-orbit is 512 and 43, respectively. The reconstruction exactness of the prototype x-ray FPI based CBVCT system is evaluated using a disc phantom in which seven acrylic discs are stacked at fixed intervals. Images reconstructed with this algorithm show that both the contrast and geometric distortion existing in the disc phantom images reconstructed by the Feldkamp algorithm are substantially reduced. Meanwhile, the imaging performance of the prototype, such as modulation transfer function (MTF) and low contrast resolution, are quantitatively evaluated in detail through corresponding phantom studies. Furthermore, the capability of the prototype to reconstruct an ROI within a longitudinally unbounded object is verified. The results obtained from this preliminary performance evaluation encourage an expectation of medical applications of the x-ray FPI based CBVCT under the circle-plus-two-arc data acquisition, particularly the application in image-guided interventional procedures and radiotherapy where the movement of a patient table is to be avoided.
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Xiangyang Tang, Xiangyang Tang, Ruola Ning, Ruola Ning, Rongfeng Yu, Rongfeng Yu, David L. Conover, David L. Conover, } "X-ray flat-panel imager (FPI)-based cone-beam volume CT (CBVCT) under a circle-plus-two-arc data acquisition orbit", Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); doi: 10.1117/12.430861; https://doi.org/10.1117/12.430861
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