Human subject portal images with a Csl(Tl) transparent scintillator

Herbert D. Zeman; Sanjiv S. Samant; Amit R. Sawant

doi:10.1117/12.349548

28 May 1999 Human subject portal images with a Csl(Tl) transparent scintillator

Herbert D. Zeman, Sanjiv S. Samant, Amit R. Sawant

Proceedings Volume 3659, Medical Imaging 1999: Physics of Medical Imaging; (1999) https://doi.org/10.1117/12.349548
Event: Medical Imaging '99, 1999, San Diego, CA, United States

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.

Citation Download Citation

Herbert D. Zeman, Sanjiv S. Samant, and Amit R. Sawant "Human subject portal images with a Csl(Tl) transparent scintillator", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); https://doi.org/10.1117/12.349548

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