Virtual alignment of x-ray cone-beam tomography system using two calibration aperture measurements

Andrei V. Bronnikov

doi:10.1117/1.602100

1 February 1999 Virtual alignment of x-ray cone-beam tomography system using two calibration aperture measurements

Andrei V. Bronnikov

Optical Engineering, Vol. 38, Issue 2, (February 1999). https://doi.org/10.1117/1.602100

In cone-beam tomography, relatively small misalignment of the imaging system is geometrically magnified and may cause severe distortion of the reconstructed image. We describe a method for alignment of a cone-beam tomography system built on an x-ray microfocus tube, an image intensifier, and a high-resolution CCD camera. To obtain geometrical parameters of system misalignment, we suggest measuring two 180-deg-opposed cone-beam radiographs of a specially manufactured calibration aperture. An advantage of the aperture over other calibration objects is that we can easily restore its idealized picture by applying a certain threshold to the measured data. The method permits the lateral displacement vector and lateral tilt angle to be accurately found. Unlike other alignment methods, our approach enables virtual system alignment by using mathematical processing of the measured data, rather than moving the parts of the system. The virtually aligned system data are used for 3-D image reconstruction by a standard filtered back- projection algorithm. Experimental results demonstrate considerable improvement of the image quality after applying the alignment method suggested.

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Andrei V. Bronnikov "Virtual alignment of x-ray cone-beam tomography system using two calibration aperture measurements," Optical Engineering 38(2), (1 February 1999). https://doi.org/10.1117/1.602100

Published: 1 February 1999

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