Description
Magnetic Resonance Spin TomogrAphy in Time-domain (MR-STAT) is a fast, multi-parametric technique which reconstruct all parameters of interest from a single short acquisition. In MR-STAT, the patient’s body is considered a large dynamical system which is probed in the time-domain by radiofrequency coils. Since the dynamic equations are well known (Faraday’s law and Bloch equation), reconstruction of the system parameters is carried out through the solution of a large-scale non-linear inversion problem directly from the time-domain data (Figure 1).
This approach allows for the spatial localization and the parameter quantification steps to be solved simultaneously. In standard qMRI, these steps are carried out subsequently, thus the spatial encoding scheme needs to fulfill either to Nyquist criteria (standard qMRI) or to certain types of incoherence (e.g. MR Fingerprinting) for a reliable reconstruction. The direct implication is that, in MR-STAT, acquisition is free from design constraints thus it can be carried out also with standard, reliable Cartesian encoding schemes. Another practical advantage of the MR-STAT approach is that all signal is fitted by a deterministic model (only the thermal noise is stochastic), thus large under-sampling artifacts are not present in MR-STAT (Figure 2). In addition, data reconstruction is performed iteratively, without the need of the pre-computed dictionary that hinders user adaptations in image protocols.
For more info check: www.umcutrecht.nl/MR-STAT.
Related publications
- Liu, H., Van der Heide, O., Mandija, S., Van den Berg, C. A., & Sbrizzi, A. (2022). Acceleration Strategies for MR-STAT: Achieving High-Resolution Reconstructions on a Desktop PC within 3 minutes. IEEE Transactions on Medical Imaging. doi:10.1109/TMI.2022.3168436;
- Sbrizzi, A., Van der Heide, O., Cloos, M., Van der Toorn, A., Hoogduin, H., Luijten, P.R. and Van den Berg, C.A., (2018). Fast quantitative MRI as a nonlinear tomography problem. Mag Res Imag 46:56-63. https://doi.org/10.1016/j.mri.2017.10.015;
- Van der Heide, O., Sbrizzi, A., Luijten, P.R. and Van den Berg, C.A., (2020). High‐resolution in vivo MR‐STAT using a matrix‐free and parallelized reconstruction algorithm. NMR in Biomedicine, 33(4):e4251. https://doi.org/10.1002/nbm.4251;
- Van der Heide, O., Sbrizzi, A., Luijten, P.R. and Van den Berg, C.A., (2020). Accelerated MR-STAT reconstructions using sparse Hessian approximations. IEEE Trans Med Imag. 39(11): 3737-48. https://doi.org/10.1109/TMI.2020.3003893.
Grants
- NWO-Open Tech 2022-2026 (PI: Alessandro Sbrizzi)
- NWO-MVI 2021-2022 (PI: Alessandro Sbrizzi)
- NWO-HTSM 2020-2024 (PI: Alessandro Sbrizzi)
- NWO-Demonstrator 2018-2020 (PI: Alessandro Sbrizzi)
- NWO-VIDI 2015-2020 (PI: Nico van den Berg)
People
Hannah Liu
Miha Fuderer
Stefano Mandija
Nico van den Berg
Alessandro Sbrizzi
