The assessment of reproducibility of Quantitative Susceptibility Mapping (QSM) is critical in multi-center studies and clinical follow-ups. However, many experimental factors and acquisition parameters may compromise quantification accuracy. In this work, we analyze the impact of echo time on intra-scanner repeatability and inter-scanner reproducibility of QSM using a 3D multi-echo GRE sequence on MRI scanners of different field strength (3T and 7T) from the same vendor.
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