Space-time Tomography for Continuously Deforming Objects

G. Zang, R. Idoughi, R. Tao, G. Lubineau, P. Wonka, W. Heidrich
ACM Transactions on Graphics (Proc. SIGGRAPH), (2018)

Space-time Tomography for Continuously Deforming Objects

Keywords

X-ray computed tomography, 4D recon-truction, Optimization

Abstract

​X-ray computed tomography (CT) is a valuable tool for analyzing objects with interesting internal structure or complex geometries that are not accessible with optical means. Unfortunately, tomographic reconstruction of complex shapes requires a multitude (often hundreds or thousands) of projections from different viewpoints. Such a large number of projections can only be acquired in a time-sequential fashion. This significantly limits the ability to use x-ray tomography for either objects that undergo uncontrolled shape change at the time scale of a scan, or else for analyzing dynamic phenomena, where the motion itself is under investigation.

In this work, we present a non-parametric space-time tomographic method for tackling such dynamic settings. Through a combination of a new CT image acquisition strategy, a space-time tomographic image formation model, and an alternating, multi-scale solver, we achieve a general approach that can be used to analyze a wide range of dynamic phenomena. We demonstrate our method with extensive experiments on both real and simulated data.

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