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Improvement in quantitative image quality metrics with FIDnav-based retrospective correction. NRMSE in percent (a) and SSIM index (b) for each motion paradigm, relative to the uncorrected reference image acquired without any voluntary motion, before correction and after retrospective correction with EM tracking and FIDnav motion estimates. FIDnav-based motion compensation yielded a significant (P<0.05; denoted by *) improvement in NRMSE and SSIM across most motion paradigms tested.
