Abstract
Grating-based X-ray phase-contrast and in particular dark-field radiography are promising new imaging modalities for medical applications. Currently, the potential advantage of dark-field imaging in early-stage diagnosis of pulmonary diseases in humans is being investigated. These studies make use of a comparatively large scanning interferometer at short acquisition times, which comes at the expense of a significantly reduced mechanical stability as compared to tabletop laboratory setups. Vibrations create random fluctuations of the grating alignment, causing artifacts in the resulting images. Here, we describe a novel maximum likelihood method for estimating this motion, thereby preventing these artifacts. It is tailored to scanning setups and does not require any sample-free areas. Unlike any previously described method, it accounts for motion in between as well as during exposures.
Original language | English |
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Pages (from-to) | 28-38 |
Number of pages | 11 |
Journal | IEEE Transactions on Medical Imaging |
Volume | 43 |
Issue number | 1 |
DOIs | |
State | Published - 1 Jan 2024 |
Keywords
- Image enhancement/restoration (noise and artifact reduction)
- X-ray imaging and computed tomography
- image reconstruction-iterative methods