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Proceedings Paper

Correction of image intensifier distortion for three-dimensional x-ray angiography
Author(s): Beth A. Schueler; Xiaoping Hu
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Paper Abstract

An algorithm has been developed to correct spatial distortion in image intensifier-based projections for three-dimensional (3D) angiographic reconstruction. A piecewise spatial warping technique is used to calculate a set of correction lookup tables which store the row and column subpixel spatial shifts, based on a reference grid image. Pixel amplitudes in the corrected image are determined from bilinear interpolation of the four surrounding pixels in the observed image. The method has been tested using an x-ray imaging chain with a 30-cm image intensifier positioned at various angular orientations and x-ray source distances. Prior to distortion correction, the maximum error between observed and expected reference point locations was found to be 14 mm. After correction, the maximum and mean errors were 0.23 mm and 0.053 mm, respectively.

Paper Details

Date Published: 8 May 1995
PDF: 8 pages
Proc. SPIE 2432, Medical Imaging 1995: Physics of Medical Imaging, (8 May 1995); doi: 10.1117/12.208345
Show Author Affiliations
Beth A. Schueler, Univ. of Minnesota Hospital and Clinic (United States)
Xiaoping Hu, Univ. of Minnesota Hospital and Clinic (United States)

Published in SPIE Proceedings Vol. 2432:
Medical Imaging 1995: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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