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Article Dans Une Revue Physics in Medicine and Biology Année : 2021

Projection-based dynamic tomography

Résumé

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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Dates et versions

hal-03391945 , version 1 (21-10-2021)

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