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Projection-based dynamic tomography

Abstract : This paper proposes a 4D dynamic tomography framework that allows a moving sample to be imaged in a tomograph as well as the associated spacetime kinematics to be measured with nothing more than a single conventional x-ray scan. The method exploits the consistency of the projection/reconstruction operations through a multi-scale procedure. The procedure is composed of two main parts solved alternatively: a motion-compensated reconstruction algorithm and a projectionbased measurement procedure that estimates the displacement field directly on each individual projection. The method is applied to two studies: a numerical simulation of breathing from chest computed tomography (4D-CT) and a clinical cone beam CT of a breathing patient acquired for image-guidance of radiotherapy. The reconstructed volume, initially blurred by the motion, is cleaned from motion artifacts. It results in an improved reconstruction quality showing sharper edges and finer details.
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Contributor : Clément Jailin Connect in order to contact the contributor
Submitted on : Thursday, October 21, 2021 - 5:52:36 PM
Last modification on : Friday, August 5, 2022 - 2:58:08 PM
Long-term archiving on: : Saturday, January 22, 2022 - 8:05:23 PM


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Clément Jailin, Stéphane Roux, David Sarrut, Simon Rit. Projection-based dynamic tomography. Physics in Medicine and Biology, IOP Publishing, 2021, 66, pp.215018. ⟨10.1088/1361-6560/ac309e⟩. ⟨hal-03391945⟩



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