Optimization method for estimating tissue microstructure size-distributions with diffusion weighted imaging

PABLO JIMÉNEZ; ANALIA ZWICK; GONZALO A. ALVAREZ

Proceedings of the International Society for Magnetic Resonance in Medicine

Wiley

Año: 2023 vol. 31

Characterization of microstructures in living-tissues by non-invasive imaging is one of the key and outstanding challenges for diagnosing early stages of pathologies and understanding disease mechanisms. Here we implement an optimal control strategy for obtaining microstructure details by Diffusion-Weighted Imaging sequences. We estimate microstructure parameters of size-distribution models for axon bundles, attaining the ultimate precision limits predicted by quantum-information tools. We performed proof-of-principle experiments of the optimization protocol with an ex-vivo mouse-brain contrasted with simulations. These results might drastically reduce the total acquisition time compared to the present state-of-the-art, opening alternative avenues towards unraveling diagnostic information by quantitative MRI.