28 May 1999 Portal CT reconstruction using the CsI(Tl) transparent scintillator x-ray detector and the MLS-ART technique
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Abstract
In this paper, we report our investigation using a CsI(Tl) transparent scintillator x-ray detector together with the multi-level scheme algebraic reconstruction technique (MLS- ART) for megavoltage computed tomography (CT) reconstructions. The reconstructed CT images may be useful for positional verification in radiotherapy. The CsI(Tl) imaging system consists of a scintillator screen coupled to a liquid- nitrogen-cooled slow-scan CCD-TV camera. This system provides better contrast resolution than the standard electronic portal imaging system (EPID), which is especially useful given the low number of projections we are aiming at. The geometry of the imaging system has also been optimized to achieve high spatial resolution (1 lp/mm) in spite of the thickness of the screen. We present the images reconstructed using a pediatric head phantom using a total of 99 projections, and a combined phantom using 50 projections. Image reconstruction was carried out using the MLS-ART technique. We also present the CT images obtained using the back projection technique for comparison purposes.
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Huaiqun Guan, Huaiqun Guan, Yunping Zhu, Yunping Zhu, M. Waleed Gaber, M. Waleed Gaber, Amit R. Sawant, Amit R. Sawant, Herbert D. Zeman, Herbert D. Zeman, } "Portal CT reconstruction using the CsI(Tl) transparent scintillator x-ray detector and the MLS-ART technique", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349495; https://doi.org/10.1117/12.349495
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