Geometric Constraints Enable Self-Supervised Sinogram Inpainting in Sparse-View Tomography

The diagnostic quality of computed tomography (CT) scans is usually restricted by the induced patient dose, scan speed, and image quality. Sparse-angle tomographic scans reduce radiation exposure and accelerate data acquisition, but suffer from image artifacts and noise. Existing image processing al...

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Bibliographic Details
Published inarXiv.org
Main Authors Wagner, Fabian, Thies, Mareike, Maul, Noah, Pfaff, Laura, Aust, Oliver, Pechmann, Sabrina, Syben, Christopher, Maier, Andreas
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 09.08.2023
Subjects
Algorithms
Computed tomography
Data acquisition
Geometric constraints
Image acquisition
Image processing
Image quality
Image restoration
Interpolation
Medical imaging
Optimization
Radiation effects
Tibia
Tomography
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Summary:The diagnostic quality of computed tomography (CT) scans is usually restricted by the induced patient dose, scan speed, and image quality. Sparse-angle tomographic scans reduce radiation exposure and accelerate data acquisition, but suffer from image artifacts and noise. Existing image processing algorithms can restore CT reconstruction quality but often require large training data sets or can not be used for truncated objects. This work presents a self-supervised projection inpainting method that allows optimizing missing projective views via gradient-based optimization. By reconstructing independent stacks of projection data, a self-supervised loss is calculated in the CT image domain and used to directly optimize projection image intensities to match the missing tomographic views constrained by the projection geometry. Our experiments on real X-ray microscope (XRM) tomographic mouse tibia bone scans show that our method improves reconstructions by 3.1-7.4%/7.7-17.6% in terms of PSNR/SSIM with respect to the interpolation baseline. Our approach is applicable as a flexible self-supervised projection inpainting tool for tomographic applications.
ISSN:2331-8422