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Proceedings Paper

Human subject portal images with a Csl(Tl) transparent scintillator
Author(s): Herbert D. Zeman; Sanjiv S. Samant; Amit R. Sawant
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Paper Abstract

In a previous paper a portal imaging system was described that used a 200 mm diameter, 12.7 mm thick CsI(Tl) crystal transparent screen coupled with a Nikkor 35 mm f1.4 lens to an Astromed liquid nitrogen cooled CCD TV camera system. The whole 200 mm circular field of the crystal was imaged at a 0.53 mm pixel size. The geometry of the imaging system was optimized to achieve high spatial resolution in spite of the thickness of the screen. Since the last paper was written, an Angenieux 25 mm f0.95 Super 16 mm movie camera lens has been purchased which has higher optical quality and slightly better depth of focus than the Nikkor 35 mm f1.4 lens, but gives a pixel size with the Astromed CCD system of 0.8 mm. The Angenieux lens has been used with the Astromed CCD and the 200 mm diameter CsI(Tl) screen to acquire portal images of human subjects. Images of patients being treated in the prostate region have been acquired. These CsI(Tl) images have been compared with portal images produced using conventional portal film. The CsI(Tl) images are of higher quality than the film images and and be acquired at lower dose.

Paper Details

Date Published: 28 May 1999
PDF: 12 pages
Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349548
Show Author Affiliations
Herbert D. Zeman, Univ. of Tennessee/Memphis (United States)
Sanjiv S. Samant, St. Jude Children's Research Hospital (United States)
Amit R. Sawant, 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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