Sodium (23Na) MRI allows non-invasive examinations of intra-organ sodium concentrations in vivo. B1 field corrections are important determinants of the sodium signal level. However, low signal-to-noise ratio (SNR) in sodium MRI makes accurate B1 mapping in reasonable scan times challenging. The aim of this study is to evaluate Bloch-Siegert off-resonance B1 field correction of sodium images in thigh muscle, heart, kidney, and brain with the use of MRI in healthy human subjects using a 3D FLORET readout trajectory.
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