High-frame-rate digital radiographic videography

Nicholas S. P. King; Frank H. Cverna; Kevin L. Albright; Steven A. Jaramillo; George J. Yates; Thomas E. McDonald; Michael J. Flynn; Scott Tashman

doi:10.1117/12.189043

14 October 1994 High-frame-rate digital radiographic videography

Nicholas S. P. King, Frank H. Cverna, Kevin L. Albright, Steven A. Jaramillo, George J. Yates, Thomas E. McDonald, Michael J. Flynn, Scott Tashman

Author Affiliations +

Proceedings Volume 2273, Ultrahigh- and High-Speed Photography, Videography, and Photonics '94; (1994) https://doi.org/10.1117/12.189043
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

High speed x-ray imaging can be an important tool for observing internal processes in a wide range of applications. In this paper we describe preliminary implementation of a system having the eventual goal of observing the internal dynamics of bone and joint reactions during loading. Two Los Alamos National Laboratory (LANL) gated and image intensified camera systems were used to record images from an x-ray image convertor tube to demonstrate the potential of high frame-rate digital radiographic videography in the analysis of bone and joint dynamics of the human body. Preliminary experiments were done at LANL to test the systems. Initial high frame-rate imaging (from 500 to 1000 frames/s) of a swinging pendulum mounted to the face of an X-ray image convertor tube demonstrated high contrast response and baseline sensitivity. The systems were then evaluated at the Motion Analysis Laboratory of Henry Ford Health Systems Bone and Joint Center. Imaging of a 9 inch acrylic disk with embedded lead markers rotating at approximately 1000 RPM, demonstrated the system response to a high velocity/high contrast target. By gating the P-20 phosphor image from the X-ray image convertor with a second image intensifier (II) and using a 100 microsecond wide optical gate through the second II, enough prompt light decay from the x-ray image convertor phosphor had taken place to achieve reduction of most of the motion blurring. Measurement of the marker velocity was made by using video frames acquired at 500 frames/s. The data obtained from both experiments successfully demonstrated the feasibility of the technique. Several key areas for improvement are discussed along with salient test results and experiment details.

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Nicholas S. P. King, Frank H. Cverna, Kevin L. Albright, Steven A. Jaramillo, George J. Yates, Thomas E. McDonald, Michael J. Flynn, and Scott Tashman "High-frame-rate digital radiographic videography", Proc. SPIE 2273, Ultrahigh- and High-Speed Photography, Videography, and Photonics '94, (14 October 1994); https://doi.org/10.1117/12.189043

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