Crystalline phase discriminating neutron tomography using advanced reconstruction methods
| Autor: | Edoardo Pasca, Philip J. Withers, William R. B. Lionheart, Genoveva Burca, Ryan Warr, Jakob Sauer Jørgensen, Evelina Ametova, Suren Chilingaryan, Gemma Fardell, Martin Turner, Evangelos Papoutsellis |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Acoustics and Ultrasonics
Physics::Medical Physics FOS: Physical sciences 02 engineering and technology Neutron scattering computer.software_genre Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics Voxel FOS: Electrical engineering electronic engineering information engineering FOS: Mathematics Mathematics - Optimization and Control Engineering & allied operations Physics Tomographic reconstruction business.industry Neutron imaging Neutron tomography Image and Video Processing (eess.IV) Hyperspectral imaging Electrical Engineering and Systems Science - Image and Video Processing 021001 nanoscience & nanotechnology Condensed Matter Physics Physics - Medical Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Optimization and Control (math.OC) Tomography Medical Physics (physics.med-ph) ddc:620 0210 nano-technology business computer |
| Zdroj: | Ametova, E, Burca, G, Chilingaryan, S, Fardell, G, Jorgensen, J, Papoutsellis, E, Pasca, E, Warr, R, Turner, M, Lionheart, W & Withers, P 2021, ' Crystalline phase discriminating neutron tomography using advanced reconstruction methods ', Journal of Physics D: Applied Physics, vol. 54, 325502 . https://doi.org/10.1088/1361-6463/ac02f9 Ametova, E, Burca, G, Chilingaryan, S, Fardell, G, Jørgensen, J S, Papoutsellis, E, Pasca, E, Warr, R, Turner, M, Lionheart, W R B & Withers, P J 2021, ' Crystalline phase discriminating neutron tomography using advanced reconstruction methods ', Journal of Physics D: Applied Physics, vol. 54, no. 32, 325502 . https://doi.org/10.1088/1361-6463/ac02f9 Journal of Physics D: Applied Physics, 54 (32), Art.-Nr.: 325502 |
| ISSN: | 0022-3727 0262-8171 0508-3443 1361-6463 2057-7656 |
| Popis: | Time-of-flight (ToF) neutron imaging offers complementary attenuation contrast to x-ray computed tomography, coupled with the ability to extract additional information from the variation in attenuation as a function of neutron energy (ToF) at every point (voxel) in the image. In particular, Bragg edge positions provide crystallographic information and therefore enable the identification of crystalline phases directly. Here we demonstrate Bragg edge tomography with high spatial and spectral resolution. We propose a new iterative tomographic reconstruction method with a tailored regularisation term to achieve high quality reconstruction from low-count data, where conventional filtered back-projection (FBP) fails. The regularisation acts in a separated mode for spatial and spectral dimensions and favours characteristic piece-wise constant and piece-wise smooth behaviour in the respective dimensions. The proposed method is compared against FBP and a state-of-the-art regulariser for multi-channel tomography on a multi-material phantom. The proposed new regulariser which accommodates specific image properties outperforms both conventional and state-of-the-art methods and therefore facilitates Bragg edge fitting at the voxel level. The proposed method requires significantly shorter exposures to retrieve features of interest. This in turn facilitates more efficient usage of expensive neutron beamline time and enables the full utilisation of state-of-the-art high resolution detectors. |
| Databáze: | OpenAIRE |
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