27 June 1988 Image Processing Of Images From Peripheral-Artery Digital Subtraction Angiography (DSA) Studies
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A system is being developed to test the possibility of doing peripheral, digital subtraction angiography (DSA) with a single contrast injection using a moving gantry system. Given repositioning errors that occur between the mask and contrast-containing images, factors affecting the success of subtractions following image registration have been investigated theoretically and experimentally. For a 1 mm gantry displacement, parallax and geometric image distortion (pin-cushion) both give subtraction errors following registration that are approximately 25% of the error resulting from no registration. Image processing techniques improve the subtractions. The geometric distortion effect is reduced using a piece-wise, 8 parameter unwarping method. Plots of image similarity measures versus pixel shift are well behaved and well fit by a parabola, leading to the development of an iterative, automatic registration algorithm that uses parabolic prediction of the new minimum. The registration algorithm converges quickly (less than 1 second on a MicroVAX) and is relatively immune to the region of interest (ROI) selected.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David L. Wilson, David L. Wilson, Lawrence R. Tarbox, Lawrence R. Tarbox, David B. Cist, David B. Cist, David D. Faul, David D. Faul, } "Image Processing Of Images From Peripheral-Artery Digital Subtraction Angiography (DSA) Studies", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); doi: 10.1117/12.968711; https://doi.org/10.1117/12.968711

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