Reduction of artifacts associated with missing data in coherent diffractive imaging
Coherent diffractive imaging experiments often collect incomplete datasets containing regions that lack any measurements. These regions can arise because of beamstops, gaps between detectors, or, in tomography experiments, a missing wedge of data due to a limited sample rotation range. We describe p...
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| Language: | English |
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International Union of Crystallography
2025-01-01
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| Series: | Journal of Synchrotron Radiation |
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| Online Access: | https://journals.iucr.org/paper?S1600577524010956 |
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| author | Erik Malm Yuriy Chushkin |
| author_facet | Erik Malm Yuriy Chushkin |
| author_sort | Erik Malm |
| collection | DOAJ |
| description | Coherent diffractive imaging experiments often collect incomplete datasets containing regions that lack any measurements. These regions can arise because of beamstops, gaps between detectors, or, in tomography experiments, a missing wedge of data due to a limited sample rotation range. We describe practical and effective approaches to mitigate reconstruction artifacts by bringing uniqueness back to the phase retrieval problem. This is accomplished by looking for a solution that both matches the data and has minimum total variation, which essentially sets the unconstrained modes to reduce oscillations within the reconstruction. Two algorithms are described. The first algorithm assumes that there is an accurate estimate of the phase and can be used for pre- and post-processing. The second algorithm attempts to simultaneously minimize the total variation and recover the phase. We demonstrate the utility of these algorithms with numerical simulations and, experimentally, on a large, three-dimensional dataset. |
| format | Article |
| id | doaj-art-648e090f845a4eedac6fead1522129f0 |
| institution | Kabale University |
| issn | 1600-5775 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | International Union of Crystallography |
| record_format | Article |
| series | Journal of Synchrotron Radiation |
| spelling | doaj-art-648e090f845a4eedac6fead1522129f02025-01-07T14:26:38ZengInternational Union of CrystallographyJournal of Synchrotron Radiation1600-57752025-01-0132121021610.1107/S1600577524010956gui5001Reduction of artifacts associated with missing data in coherent diffractive imagingErik Malm0Yuriy Chushkin1MAX IV Laboratory, Lund University, 22100 Lund, SwedenESRF – The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, FranceCoherent diffractive imaging experiments often collect incomplete datasets containing regions that lack any measurements. These regions can arise because of beamstops, gaps between detectors, or, in tomography experiments, a missing wedge of data due to a limited sample rotation range. We describe practical and effective approaches to mitigate reconstruction artifacts by bringing uniqueness back to the phase retrieval problem. This is accomplished by looking for a solution that both matches the data and has minimum total variation, which essentially sets the unconstrained modes to reduce oscillations within the reconstruction. Two algorithms are described. The first algorithm assumes that there is an accurate estimate of the phase and can be used for pre- and post-processing. The second algorithm attempts to simultaneously minimize the total variation and recover the phase. We demonstrate the utility of these algorithms with numerical simulations and, experimentally, on a large, three-dimensional dataset.https://journals.iucr.org/paper?S1600577524010956phase retrievalcoherent diffractive imagingtomography |
| spellingShingle | Erik Malm Yuriy Chushkin Reduction of artifacts associated with missing data in coherent diffractive imaging Journal of Synchrotron Radiation phase retrieval coherent diffractive imaging tomography |
| title | Reduction of artifacts associated with missing data in coherent diffractive imaging |
| title_full | Reduction of artifacts associated with missing data in coherent diffractive imaging |
| title_fullStr | Reduction of artifacts associated with missing data in coherent diffractive imaging |
| title_full_unstemmed | Reduction of artifacts associated with missing data in coherent diffractive imaging |
| title_short | Reduction of artifacts associated with missing data in coherent diffractive imaging |
| title_sort | reduction of artifacts associated with missing data in coherent diffractive imaging |
| topic | phase retrieval coherent diffractive imaging tomography |
| url | https://journals.iucr.org/paper?S1600577524010956 |
| work_keys_str_mv | AT erikmalm reductionofartifactsassociatedwithmissingdataincoherentdiffractiveimaging AT yuriychushkin reductionofartifactsassociatedwithmissingdataincoherentdiffractiveimaging |