Correcting directional dark-field x-ray imaging artefacts using position-dependent image deblurring and attenuation removal
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917657978077184 |
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| author | Croughan, Michelle K Paganin, David M Alloo, Samantha J Ahlers, Jannis N How, Ying Ying Harker, Stephanie A Morgan, Kaye S. |
| author_facet | Croughan, Michelle K Paganin, David M Alloo, Samantha J Ahlers, Jannis N How, Ying Ying Harker, Stephanie A Morgan, Kaye S. |
| contents | In recent years, a novel x-ray imaging modality has emerged that reveals unresolved sample microstructure via a "dark-field image", which provides complementary information to conventional "bright-field" images, such as attenuation and phase-contrast modalities. This x-ray dark-field signal is produced by unresolved microstructures scattering the x-ray beam resulting in localised image blur. Dark-field retrieval techniques extract this blur to reconstruct a dark-field image. Unfortunately, the presence of non-dark-field blur such as source-size blur or the detector point-spread-function can affect the dark-field retrieval as they also blur the experimental image. In addition, dark-field images can be degraded by the artefacts induced by large intensity gradients from attenuation and propagation-based phase contrast, particularly around sample edges. By measuring any non-dark-field blurring across the image plane and removing it from experimental images, as well as removing attenuation and propagation-based phase contrast, we show that a directional dark-field image can be retrieved with fewer artefacts and more consistent quantitative measures. We present the details of these corrections and provide "before and after" directional dark-field images of samples imaged at a synchrotron source. This paper utilises single-grid directional dark-field imaging, but these corrections have the potential to be broadly applied to other x-ray imaging techniques. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_17612 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Correcting directional dark-field x-ray imaging artefacts using position-dependent image deblurring and attenuation removal Croughan, Michelle K Paganin, David M Alloo, Samantha J Ahlers, Jannis N How, Ying Ying Harker, Stephanie A Morgan, Kaye S. Medical Physics Optics In recent years, a novel x-ray imaging modality has emerged that reveals unresolved sample microstructure via a "dark-field image", which provides complementary information to conventional "bright-field" images, such as attenuation and phase-contrast modalities. This x-ray dark-field signal is produced by unresolved microstructures scattering the x-ray beam resulting in localised image blur. Dark-field retrieval techniques extract this blur to reconstruct a dark-field image. Unfortunately, the presence of non-dark-field blur such as source-size blur or the detector point-spread-function can affect the dark-field retrieval as they also blur the experimental image. In addition, dark-field images can be degraded by the artefacts induced by large intensity gradients from attenuation and propagation-based phase contrast, particularly around sample edges. By measuring any non-dark-field blurring across the image plane and removing it from experimental images, as well as removing attenuation and propagation-based phase contrast, we show that a directional dark-field image can be retrieved with fewer artefacts and more consistent quantitative measures. We present the details of these corrections and provide "before and after" directional dark-field images of samples imaged at a synchrotron source. This paper utilises single-grid directional dark-field imaging, but these corrections have the potential to be broadly applied to other x-ray imaging techniques. |
| title | Correcting directional dark-field x-ray imaging artefacts using position-dependent image deblurring and attenuation removal |
| topic | Medical Physics Optics |
| url | https://arxiv.org/abs/2404.17612 |