Portal CT reconstruction using the CsI(Tl) transparent scintillator x-ray detector and the MLS-ART technique

Huaiqun Guan, Yunping Zhu, M. Waleed Gaber, Amit Sawant, Herbert Zeman

Research output: Chapter in Book/Report/Conference proceedingChapter

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 languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages215-222
Number of pages8
Volume3659
EditionI
StatePublished - 1999
EventProceedings of the 1999 Medical Imaging - Physics of Medical Imaging - San Diego, CA, USA
Duration: Feb 21 1999Feb 23 1999

Other

OtherProceedings of the 1999 Medical Imaging - Physics of Medical Imaging
CitySan Diego, CA, USA
Period2/21/992/23/99

    Fingerprint

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Guan, H., Zhu, Y., Gaber, M. W., Sawant, A., & Zeman, H. (1999). Portal CT reconstruction using the CsI(Tl) transparent scintillator x-ray detector and the MLS-ART technique. In Proceedings of SPIE - The International Society for Optical Engineering (I ed., Vol. 3659, pp. 215-222). Society of Photo-Optical Instrumentation Engineers.