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Proceedings Paper

6-MVp x-ray imaging with a transparent scintillator x-ray detector
Author(s): Herbert D. Zeman; Sanjiv S. Samant; Jacob Rasmussen
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Paper Abstract

In a previous paper an x-ray medical imaging system was described that used a liquid nitrogen cooled slow-scan CCD TV camera coupled to a Gd2O3(Eu) transparent ceramic scintillator plate with a high speed macro lens. This imaging system, which has a high spatial resolution and high x-ray quantum efficiency, suffers in the normal diagnostic x-ray energy range from added noise due to the secondary light photon quantum sink. For each x-ray photon absorbed, less than one electron is produced in a CCD pixel. However in the x-ray energy range used in radiation therapy the light output per absorbed x-ray photon is much higher, making the transparent scintillator technique more practical. Also the dose applied in radiation therapy is high anyway, allowing the use of higher dose to give better image quality. The 16-bit resolution of the cooled CCD allows very accurate x-ray absorption data to be acquired compared to the 8-bit CCDs used in commercially available portal imagers. Images have been acquired of human bones using the Gd2O3(Eu) screen and a 3 mm thick CsI(Tl) crystal.

Paper Details

Date Published: 2 May 1997
PDF: 7 pages
Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997); doi: 10.1117/12.274006
Show Author Affiliations
Herbert D. Zeman, Univ. of Tennessee/Memphis (United States)
Sanjiv S. Samant, Univ. of Tennessee/Memphis (United States)
Jacob Rasmussen, Univ. of Memphis (United States)

Published in SPIE Proceedings Vol. 3032:
Medical Imaging 1997: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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