An algorithm for correction of distortion in stereotaxic digital subtraction angiography |
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Authors: | M Söderman C Picard K Ericson |
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Institution: | (1) Department of Neuroradiology, Karolinska Hospital, Box 130, S-17176 Stockholm, Sweden Tel. + 46-8-7294037 Fax + 46-8-7293168, SE;(2) Research and Development, General Electric Medical Systems, Buc, France, FR |
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Abstract: | An algorithm for correction of the geometrical distortion in digital subtraction angiography (DSA) images was developed.
Originally invented for 3D X-ray angiography, the algorithm was implemented in a computer program designed to fulfil the specific
needs of stereotaxic DSA. The algorithm is based on transformation of an image of a grid from a distorted image back into
its original pattern. The same transformation is then applied pixel-by-pixel to the angiographic images, which are acquired
in direct conjunction with the grid image, without moving the gantry. The algorithm was tested in phantom studies and in the
clinical situation with seven patients in ten examinations. Comparisons were made between co-ordinate determinations made
on conventional full-size cut film and those performed on uncorrected and corrected DSA images, using 30- and 23-cm fields
of view. With our method of measurement we could not show any remaining geometric distortion in the corrected DSA images.
This distortion correction can, if properly applied, be used for high-precision stereotaxic DSA.
Received: 16 September 1995 Accepted: 5 January 1996 |
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Keywords: | Stereotaxic techniques Angiography digital subtraction Therapeutic radiology Image processing computer assisted |
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