Shirin Shoushtari

Ph.D. Candidate in Electrical & Systems Engineering, Washington University in St. Louis

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St. Louis, MO

I am a Ph.D. candidate in Electrical and Systems Engineering at Washington University in St. Louis, advised by Prof. Ulugbek S. Kamilov in the Computational Imaging Group.

I develop theory and algorithms for deep learning-based imaging inverse problems, with an emphasis on optimization-driven methods, generative models, and robustness under distribution shift. My work spans convergence analysis of plug-and-play and diffusion-based solvers, out-of-distribution detection, and measuring distribution shift directly from measurements, with applications to computational and quantitative MRI.

Going forward, I am particularly interested in flow matching: its deep connections to optimization and minimization theory, and how those connections can be used to design principled solvers for imaging inverse problems with provable guarantees. You can read more on my research page.

Before WashU, I received my M.Sc. and B.Sc. in Electrical Engineering from Sharif University of Technology. Outside of research, I enjoy literature and philosophy, classical music, film, and learning languages.

news

Oct 03, 2026 I will be speaking on Physics-Constrained Flow Matching for Inverse Problems at the SIAM Conference on Imaging Science (IS26) in Salt Lake City, November 16–19, 2026, supported by a SIAM Travel Award.
Oct 02, 2026 Two new preprints are out: SNaP: One-Step Posterior Sampling for Noisy Inverse Problems (arXiv, project) and FIRM: Flow-based Imaging via Regularized Minimization (arXiv, project).
Mar 01, 2026 Our CAMSAP 2025 paper on distribution shift estimation in imaging inverse problems is now out in IEEE Xplore.
Jan 01, 2026 Three papers accepted: EigenScore and Measurement Score-Based Diffusion Model at ICLR 2026, and Moments Matter at ICASSP 2026.
Oct 01, 2025 I gave a talk on out-of-distribution detection via uncertainty quantification at Asilomar 2025.

selected publications

  1. EigenScore: OOD Detection using Covariance in Diffusion Models
    Shirin Shoushtari, Yi Wang, Xiao Shi, and 2 more authors
    In International Conference on Learning Representations (ICLR), 2026
  2. arXiv
    Unsupervised Detection of Distribution Shift in Inverse Problems using Diffusion Models
    Shirin Shoushtari, Edward P. Chandler, M. Salman Asif, and 1 more author
    arXiv preprint, 2025
  3. Prior Mismatch and Adaptation in PnP-ADMM with a Nonconvex Convergence Analysis
    Shirin Shoushtari*, Jiaming Liu*, Edward P. Chandler, and 2 more authors
    In International Conference on Machine Learning (ICML), 2024
  4. Block Coordinate Plug-and-Play Methods for Blind Inverse Problems
    Weijie Gan, Shirin Shoushtari, Yuyang Hu, and 3 more authors
    In Advances in Neural Information Processing Systems (NeurIPS), 2023
  5. JSAIT
    Deep Model-based Architectures for Inverse Problems under Mismatched Priors
    Shirin Shoushtari, Jiaming Liu, Yuyang Hu, and 1 more author
    IEEE Journal on Selected Areas in Information Theory, 2022