Real time radial and tangential tomosynthesis system dedicated to on line x-ray examination of moving objects

Antonakios, M.; Rizo, Ph.; Lamarque, P.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p2099
Academic Journal
This presentation describes a system able to compute and display in real time a reconstructed image of a moving object using tomosynthesis methods. The object being moved on a known trajectory between the x-ray source and a detector, the tomosynthesis is focused on a given surface of the object and allows to reconstruct a sharp image of the structure on the surface superimposed to a blurred image of the surrounding plane. The developed tomosynthesis algorithm is based on a set of look up tables which provide for each position of the object on the trajectory, the projection of a given point of the imaged surface of the object on the detector. Several hundreds of frames can be combined to compute the tomosynthesis image. The signal-to-noise ratio obtained on processed images is equivalent to the one obtained by averaging images with a static object. In order to speed up the tomosynthesis reconstruction and to reach the video frame rate, we integrated a DSP based hardware in a PC host. The geometric calibration parameters and the look up tables are pre-computed on the PC. The on-line tomosynthesis calculation is carried out by the multi DSP architecture which manages in real time, frame acquisition, parallel tomosynthesis calculation and output image display. On this particular implementation of tomosynthesis, up to hundred video frames can be combined. We illustrate the potential of this system on an application of the tomosynthesis to solid rocket motor examination. © 2000 American Institute of Physics.


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