12 May 1995 Quantitative evaluation of an algorithm for correcting geometrical distortions in DSA images: applications to stereotaxy
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Abstract
In digital subtraction angiography, the use of an image intensifier as a detector introduces geometrical distortions in the images. For stereotactic applications, such as the irradiation of cerebral arteriovenous malformations, these distortions have necessarily to be corrected, and the accuracy of this correction has to be examined. As the distortions depend on many parameters that vary during an examination (such as magnetic field and spatial position of the acquisition chain), the correction accuracy must be defined as a function of the acquisition protocol. We have developed a correction method based on the calibration of geometrical distortions using an image of a grid phantom. An experimental study of the influence of acquisition parameters over the distortion has been performed. A protocol has been defined which ensures a correction accuracy of 0.1 millimeter. Finally, we have studied the accuracy obtained in the 3D location of a target as a function of the accuracy of the distortion correction. The final precision allows the use of our method for digital x-ray stereotactic applications.
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Laurent Launay, Laurent Launay, Catherine L. Picard, Catherine L. Picard, Eric Maurincomme, Eric Maurincomme, Rene Anxionnat, Rene Anxionnat, Pierre Bouchet, Pierre Bouchet, Luc Picard, Luc Picard, } "Quantitative evaluation of an algorithm for correcting geometrical distortions in DSA images: applications to stereotaxy", Proc. SPIE 2434, Medical Imaging 1995: Image Processing, (12 May 1995); doi: 10.1117/12.208722; https://doi.org/10.1117/12.208722
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