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Practical cone-beam lambda tomography
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DOI：10.1118/1.2348767.png)
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Abstract
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As a potentially important technology for medical x-ray computed tomography (CT), lambda tomography (LT) is to reconstruct a gradient-like image only from local projection data. Based on our recently derived exact fan-beam LT formula, [H. Y. Gu and G. Wang, Int. J. Biomed. Imaging 2006(1), 1-9 (2006)] here we propose a practical cone-beam LT algorithm for LT reconstruction from local data collected along an arbitrary smooth three-dimensional curve. A key step in our algorithm is to determine an appropriate vector perpendicular to the line connecting the x-ray source and an image point. The algorithm is implemented assuming an equispatial planar detector and a nonstandard spiral trajectory. The numerical simulation results demonstrate the merits of our method. (c) 2006 American Association of Physicists in Medicine.
Keywords:
computed tomography (CT)
region-of-interest (ROI)
lambda tomography (LT)
cone-beam
general scanning trajectory
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