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Optical Engineering

Spatiotemporal computed tomography of dynamic processes
Author(s): Anders P. Kaestner; Beat Munch; Pavel Trtik
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Paper Abstract

Modern computed tomography (CT) equipment allowing fast 3-D imaging also makes it possible to monitor dynamic processes by 4-D imaging. Because the acquisition time of various 3-D-CT systems is still in the range of at least milliseconds or even hours, depending on the detector system and the source, the balance of the desired temporal and spatial resolution must be adjusted. Furthermore, motion artifacts will occur, especially at high spatial resolution and longer measuring times. We propose two approaches based on nonsequential projection angle sequences allowing a convenient postacquisition balance of temporal and spatial resolution. Both strategies are compatible with existing instruments, needing only a simple reprograming of the angle list used for projection acquisition and care with the projection order list. Both approaches will reduce the impact of artifacts due to motion. The strategies are applied and validated with cold neutron imaging of water desorption from originally saturated particles during natural air-drying experiments and with x-ray tomography of a polymer blend heated during imaging.

Paper Details

Date Published: 1 December 2011
PDF: 10 pages
Opt. Eng. 50(12) 123201 doi: 10.1117/1.3660298
Published in: Optical Engineering Volume 50, Issue 12
Show Author Affiliations
Anders P. Kaestner, Paul Scherrer Institut (Switzerland)
Beat Munch, EMPA (Switzerland)
Pavel Trtik, EMPA (Switzerland)


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