X-Ray Cone Beam Tomography with Two Tilted Circular Trajectories

  • Philippe Rizo
  • Pierre Grangeat
  • Pascal Sire
  • Patrick Le Masson
  • Solange Delagenière
Part of the Advances in Cryogenic Engineering book series (volume 28)


Recently 3-D cone-beam tomography has become of interest for the nondestructive evaluation of advanced materials. The main field of application in nondestructive testing is the evaluation of structural ceramics. Study of such materials implies high density resolution and high sensitivity to cracks. In fact, with a single circular source trajectory, when the cone-beam aperture increases, density is underestimated and cone shaped artifacts may appear at interfaces in the sample even at relatively small aperture [1–3]. These artifacts limit the thickness we can examine with a planar source trajectory. To maintain optimal reconstruction accuracy with a circular source trajectory, the angular aperture must remain within ±10°. However Kudo and Saito [4] showed that this limit can be slightly overcome by using a special interpolation of the shadow area. But to examine greater thicknesses and to maintain resolution, we must widen the cone-beam aperture thereby decreasing accuracy. To overcome these aperture limitations, Tuy [5] introduced the double circular source trajectory idea.


Modulation Transfer Function Density Threshold Shadow Area Circular Trajectory Acquisition Geometry 
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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Philippe Rizo
    • 1
  • Pierre Grangeat
    • 1
  • Pascal Sire
    • 1
  • Patrick Le Masson
    • 1
  • Solange Delagenière
    • 1
  1. 1.Laboratoire d’Electronique de Technologie et d’Instrumentation Département SystèmesCentre d’Etudes Nucléaires de GrenobleGrenoble CedexFrance

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