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Proceedings Paper

Portal CT reconstruction using the CsI(Tl) transparent scintillator x-ray detector and the MLS-ART technique
Author(s): Huaiqun Guan; Yunping Zhu; M. Waleed Gaber; Amit R. Sawant; Herbert D. Zeman
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Paper 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.

Paper Details

Date Published: 28 May 1999
PDF: 8 pages
Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349495
Show Author Affiliations
Huaiqun Guan, St. Jude Children's Research Hospital (United States)
Yunping Zhu, St. Jude Children's Research Hospital (United States)
M. Waleed Gaber, St. Jude Children's Research Hospital (United States)
Amit R. Sawant, Univ. of Tennessee/Memphis (United States)
Herbert D. Zeman, Univ. of Tennessee/Memphis (United States)


Published in SPIE Proceedings Vol. 3659:
Medical Imaging 1999: Physics of Medical Imaging
John M. Boone; James T. Dobbins, Editor(s)

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