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Title: High frame-rate digital radiographic videography

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 throughmore » 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.« less
Authors:
; ; ; ; ;  [1] ; ;  [2]
  1. Los Alamos National Lab., NM (United States)
  2. Henry Ford Health System, Detroit, MI (United States)
Publication Date:
OSTI Identifier:
10180452
Report Number(s):
LA-UR--94-2792; CONF-940723--20
ON: DE94018273
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting of the Society of Photo-Optical Instrumentation Engineers,San Diego, CA (United States),24-29 Jul 1994; Other Information: PBD: [1994]
Research Org:
Los Alamos National Lab., NM (United States)
Sponsoring Org:
Department of Defense, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; 59 BASIC BIOLOGICAL SCIENCES; SKELETON; X-RAY RADIOGRAPHY; BONE JOINTS; BIOMEDICAL RADIOGRAPHY; DYNAMIC LOADS; RECORDING SYSTEMS 550602; 551000; EXTERNAL RADIATION IN DIAGNOSTICS; PHYSIOLOGICAL SYSTEMS