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Conference papers

Direct backprojection-filtration formula for region-of-interest imaging with few additional projections

Abstract : This paper provides a backprojection-filtration method for image reconstruction in divergent circular fan-beam and cone-beam geometries with flat detectors. It is based on a splitting of the acquisition angular range into angular sectors admitting filtering orientations in the image space where a simple, mono-directional Fourier-based filtering is possible. The new workflow is used for region-of-interest (ROI) reconstruction from dual-rotation acquisitions, consisting of a truncated, densely sampled acquisition and of a few additional non-truncated views. Results show that the reconstructed images using our new approach are similar to what FBP would achieve in the non- truncated case, and demonstrate the feasibility of an accurate direct reconstruction method for dual-rotation ROI imaging with very few non-truncated views.
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Conference papers
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Submitted on : Saturday, September 14, 2019 - 6:54:34 PM
Last modification on : Wednesday, November 3, 2021 - 6:18:40 AM


  • HAL Id : hal-02288517, version 1


Aymeric Reshef, Cyril Riddell, yves Tousset, Saïd Ladjal, Isabelle Bloch. Direct backprojection-filtration formula for region-of-interest imaging with few additional projections. Fifth International Conference on Image Formation in X-Ray Computed Tomography, May 2018, Salt Lake City, Utah, United States. ⟨hal-02288517⟩



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