Sodium relaxation behavior has been related to structural and cellular integrity, which is of interest for early disease detection. However, the short T2* values, bi-exponential relaxation behavior and low sensitivity makes accurate signal characterization challenging. In this work a 3D-UTE-FID-SI sequence was developed to measure the sodium decay curve with a 32kHz temporal resolution and sub-ms TE to characterize the bi-exponential signal decay characteristics of sodium in vitro and in vivo.
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