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This paper introduces a fully differentiable method for correcting jitter in X-ray phase-contrast micro-computed tomography by leveraging a deep learning-based image quality metric that compensates for per-projection rigid jitter without requiring a pre-scan reference. The approach utilizes a gradient-based auto-focus strategy tailored for parallel-beam geometry and benchmarks various objective functions to assess the sensitivity of the visual information fidelity (VIF) metric to jitter artifacts. Experimental results on biological specimens demonstrate that the method effectively recovers fine structural details lost due to jitter, showcasing its generalizability across different sample morphologies.
A deep learning approach can correct jitter in phase-contrast micro-CT images without needing a motion-free reference, significantly enhancing image quality.
This paper proposes a fully differentiable jitter correction method for X-ray phase-contrast micro computed tomography using a deep learning-based image quality metric that estimates and compensates per-projection rigid jitter directly from the acquired projection data, without a pre-scan motion-free reference. The approach builds on a gradient-based auto-focus strategy adapted to parallel-beam geometry. A set of candidate objective functions is benchmarked in a controlled study, and the sensitivity of the visual information fidelity (VIF) metric to the jitter artifact is verified with the target phase-contrast data. To operate without a clean reference, a compact 3D convolutional neural network is trained to predict the VIF score from a single corrupted volume. A spatially selective total variation penalty applied exclusively to the image background is introduced to penalize spurious high-frequency structures that otherwise emerge during optimization. Experiments on biological specimens acquired at different synchrotron beamlines are conducted. Evaluation uses jitter motion applied to simulated and experimentally acquired projection data. The result confirms that the integrated pipeline reliably recovers fine structural detail lost due to jitter, with generalization demonstrated across morphologically distinct samples.
