Employing temporal self-similarity across the entire time domain in computed tomography reconstruction.
There are many cases where one needs to limit the X-ray dose, or the number of projections, or both, for high frame rate (fast) imaging. Normally, it improves temporal resolution but reduces the spatial resolution of the reconstructed data. Fortunately, the redundancy of information in the temporal domain can be employed to improve spatial resolution. In this paper, we propose a novel regularizer for iterative reconstruction of time-lapse computed tomography. The non-local penalty term is driven by the available prior information and employs all available temporal data to improve the spatial resolution of each individual time frame. A high-resolution prior image from the same or a different imaging modality is used to enhance edges which remain stationary throughout the acquisition time while dynamic features tend to be regularized spatially. Effective computational performance together with robust improvement in spatial and temporal resolution makes the proposed method a competitive tool to state-of-the-art techniques.
Manchester X-ray Imaging Facility, School of Materials, University of Manchester, Manchester M13 9PL, UK Research Complex at Harwell, Didcot, Oxfordshire OX11 0FA, UK daniil.kazantsev@manchester.ac.uk.
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D
Kazantsev
iMinds-Vision Lab, University of Antwerp, 2610 Wilrijk, Belgium.
G
G
Van Eyndhoven
School of Mathematics, University of Manchester, Alan Turing Building, Manchester M13 9PL, UK.
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WR
Lionheart
Manchester X-ray Imaging Facility, School of Materials, University of Manchester, Manchester M13 9PL, UK Research Complex at Harwell, Didcot, Oxfordshire OX11 0FA, UK.
P J
PJ
Withers
Department of Earth and Environmental Sciences, Ludwig Maximilian University, Munich, Germany.
K J
KJ
Dobson
Manchester X-ray Imaging Facility, School of Materials, University of Manchester, Manchester M13 9PL, UK.
S A
SA
McDonald
Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK.
R
R
Atwood
Manchester X-ray Imaging Facility, School of Materials, University of Manchester, Manchester M13 9PL, UK Research Complex at Harwell, Didcot, Oxfordshire OX11 0FA, UK.
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PD
Lee
iterative reconstruction; non-local means; spatial–temporal regularization; structural prior; time lapse tomography