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Physics-Informed Joint Multi-TE Super-Resolution With Implicit Neural Representation for Robust Fetal T2 Mapping

MCML Authors

Abstract

T2 mapping in fetal brain MRI has the potential to improve characterization of the developing brain, especially at mid-field (0.55T), where T2 decay is slower. However, this is challenging as fetal MRI acquisition relies on multiple motion-corrupted stacks of thick slices, requiring slice-to-volume reconstruction (SVR) to estimate a high-resolution (HR) 3D volume. Currently, T2 mapping involves repeated acquisitions of these stacks at each echo time (TE), leading to long scan times and high sensitivity to motion. We tackle this challenge with a method that jointly reconstructs data across TEs, addressing severe motion. Our approach combines implicit neural representations with a physics-informed regularization that models T2 decay, enabling information sharing across TEs while preserving anatomical and quantitative T2 fidelity. We demonstrate state-of-the-art performance on simulated fetal brain and in vivo adult datasets with fetal-like motion. We also present the first in vivo fetal T2 mapping results at 0.55T. Our study shows potential for reducing the number of stacks per TE in T2 mapping by leveraging anatomical redundancy.

inproceedings

PIPPI @MICCAI 2025

10th Workshop in Perinatal, Preterm and Paediatric Image Analysis at the 28th International Conference on Medical Image Computing and Computer Assisted Intervention. Daejeon, Republic of Korea, Sep 23-27, 2025.

Authors

B. Bulut • M. Dannecker • T. Sanchez • S. N. Silva • V. Zalevskyi • S. Jia • J.-B. Ledoux • G. Auzias • F. Rousseau • J. Hutter • D. Rückert • M. Bach Cuadra

Links

DOI

Research Area

 C1 | Medicine

BibTeXKey: BDS+25a

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