Large area x-ray sensitive video camera: overall feasibility

Randy P. Luhta; John A. Rowlands

doi:10.1117/12.274027

2 May 1997 Large area x-ray sensitive video camera: overall feasibility

Randy P. Luhta, John A. Rowlands

Proceedings Volume 3032, Medical Imaging 1997: Physics of Medical Imaging; (1997) https://doi.org/10.1117/12.274027
Event: Medical Imaging 1997, 1997, Newport Beach, CA, United States

Abstract

A large area x-ray sensitive vidicon is an alternative to the x-ray image intensifier and television camera combination. The proposed x-ray vidicon utilizes an amorphous selenium photoconductive layer which has a higher intrinsic resolution in comparison to the input phosphor of an XRII. This higher resolution could benefit diagnostic cardiac angiography as well as interventional cardiac procedures which now frequency utilize XRII/TV zoom modes to achieve higher resolution. Signal, noise, resolution and lag of an x-ray vidicon have been analyzed theoretically and indicate a medically practical device is possible. The use of a large potential to bias the a-Se photoconductor presents a problem with respect to instability of the a-Se surface potential and excessive dark current. The incorporation of a suppressor mesh into the vidicon has been shown to provide stable vidicon operation while experiments involving a-Se blocking contacts have lead to the development of an a-Se layer with low dark current.

Citation Download Citation

Randy P. Luhta and John A. Rowlands "Large area x-ray sensitive video camera: overall feasibility", Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997); https://doi.org/10.1117/12.274027

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