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.
Original language | English (US) |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Publisher | Society of Photo-Optical Instrumentation Engineers |
Pages | 215-222 |
Number of pages | 8 |
Volume | 3659 |
Edition | I |
State | Published - 1999 |
Event | Proceedings of the 1999 Medical Imaging - Physics of Medical Imaging - San Diego, CA, USA Duration: Feb 21 1999 → Feb 23 1999 |
Other
Other | Proceedings of the 1999 Medical Imaging - Physics of Medical Imaging |
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City | San Diego, CA, USA |
Period | 2/21/99 → 2/23/99 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics