Real-time digital radiographic system with continuously variable magnification using an intensified CCD camera and a fluorescent screen

Mauro Gambaccini; Angelo Taibi; Michele Marziani; Alberto Del Guerra

doi:10.1117/12.176572

26 May 1994 Real-time digital radiographic system with continuously variable magnification using an intensified CCD camera and a fluorescent screen

Mauro Gambaccini, Angelo Taibi, Michele Marziani, Alberto Del Guerra

Author Affiliations +

Proceedings Volume 2132, Clinical Applications of Modern Imaging Technology II; (1994) https://doi.org/10.1117/12.176572
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We are investigating the performance of a digital photoelectronic imaging system assembled in our laboratory. The primary radiological image is converted to a visible image by a Gd₂O₂S:Tb fluorescent screen optically coupled to a microchannel plate intensified CCD camera. The imaging system includes a motorized zoom lens, with a nominal zoom range of 6, for changing the imaging field size from 12.0 X 10.7 mm² to 63 X 56 mm². Video images are digitized by a real-time frame grabber, integrated with a personal computer for image processing and analysis by using specially developed computer software. The Modulation Transfer Functions of the system have been determined for various zoom factors. A spatial resolution limit of 7.5 lp/mm and of 2.5 lp/mm has been obtained for the maximum and the minimum optical zoom factor, respectively. For large zoom factors the resolution limit is due to the intrinsic resolution of the fluorescent screen.

Citation Download Citation

Mauro Gambaccini, Angelo Taibi, Michele Marziani, and Alberto Del Guerra "Real-time digital radiographic system with continuously variable magnification using an intensified CCD camera and a fluorescent screen", Proc. SPIE 2132, Clinical Applications of Modern Imaging Technology II, (26 May 1994); https://doi.org/10.1117/12.176572

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