Ms. Lacey Stewart Profile

Lacey Stewart

at Bechtel Nevada

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Proceedings Article | 19 October 1999 Paper

Large-format radiographic imaging

Stuart Baker, Wilfred Lewis, John Rohrer, Lacey Stewart, Nicholas King, Mark Wilke

Proceedings Volume 3768, (1999) https://doi.org/10.1117/12.366596

KEYWORDS: Imaging systems, CCD cameras, Microchannel plates, Fiber optics, Cameras, Scintillators, Diodes, Electro optics, Charge-coupled devices, Signal detection

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Radiographic imaging continues to be a key diagnostic in many areas at Los Alamos National Laboratory. Radiographic recording systems have taken on many forms, from high repetition-rate, gated systems to film recording and storage phosphors. Some systems are designed for synchronization to an accelerator while others may be single shot or may record a frame sequence in adynamic radiographic experiment. While film recording remains a reliable standby in the radiographic community, there is growing interest in investigating electronic recording for many applications. The advantages of real time access to remote data acquisition are highly attractive. Cooled charge-coupled (CCD) camera systems are capable of providing greater sensitivity with improved signal-to-noise ratio. This paper begins with a review of performance characteristics of the Bechtel Nevada large format imaging systems, a gated system capable of viewing scintillators up to 300 mm in diameter. We then examine configuration alternatives in lens coupled and fiber optically coupled electro-optical recording systems. Areas of investigation include tradeoffs between fiber optic and lens coupling, methods of image magnification, and spectral matching from scintillator to CCD camera. Key performance features discussed include field of view, resolution, sensitivity, dynamic range, and system noise characteristics.

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