Author

Honglei Brinkmann

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#machine learning Preprint Oct 2026

Geometry-Aware Diffusion Approximate Posterior Sampling for Sparse-View and Limited-Angle CT

Sparse-view computed tomography (CT) reduces radiation dose and acquisition time and may mitigate motion artifacts. However, angular undersampling provides insufficient information to determine the image uniquely and stably. Limited-angle CT, arising from restricted angular coverage, produces strongly directional infor...

Honglei Brinkmann, C. Schönlieb, A. Biguri · 0 citations

#machine learning Preprint Sep 2026

Beyond Unimodal Bases: Pullback Geometry for Multimodal Data

Data-driven Riemannian geometry provides nonlinear interpolation and geometric representations of high-dimensional data. For these operations to be statistically meaningful, paths between observations should preferentially traverse high-likelihood regions. Existing scalable pullback constructions typically use a unimod...

Honglei Brinkmann, Lucas Ng, Georgios Batzolis et al. · 0 citations