Work

Efficient 3D FISP-MRF at 0.55 T using long spiral readouts and concomitant field effect mitigation

Year: 2025

Type: article

Abstract: PURPOSE: To demonstrate the feasibility of SNR-efficient 3D fast imaging with steady state precession MR fingerprinting (FISP-MRF) using long spiral readouts with mitigation of concomitant field effects at 0.55 T. METHODS: Fourteen FISP-MRF sequences with different spiral readout lengths (2.9 ms to 22.0 ms) were implemented with the open-source Pulseq framework. Datasets were reconstructed using a low-rank and subspace model-based reconstruction combined with MaxGIRF spatial encoding model. Concomitant field-induced blurring and MRF precision were evaluated using reconstructed images and quantitative maps acquired from an ACR phantom, an ISMRM/NIST system phantom, and 2 healthy volunteers. RESULTS: standard deviations of in-vivo white matter were reduced by ∼50 %, and concomitant field mitigation was necessary. Residual spatial blurring was non-negligible for readouts ≥16.5 ms, suggesting an operating regime (2.9-16.5 ms) for 3D FISP-MRF at 0.55 T. CONCLUSION: We demonstrate SNR-efficient 3D FISP-MRF using long spiral readouts in conjunction with concomitant field-induced blurring mitigation. A wide operating regime with improved precision is feasible only after concomitant field mitigation.

Source: Magnetic Resonance Imaging

DOI: 10.1016/j.mri.2025.110357

Authors: Zhibo Zhu, Nam G. Lee, Krishna S. Nayak

Institution: University of Southern California

Language: English

Topic: Advanced MRI Techniques and Applications

Subfield: Radiology, Nuclear Medicine and Imaging

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $3,380