Sodium inversion recovery MRI on the knee joint with an optimal inversion pulse

In the filed of sodium MRI, IR has been a popular method to discriminate the sodium content between different environments. While adiabatic pulses, such as WURST pulses, are usually used for the better inversion of the magnetization vector under B ₀ and B ₁ inhomogeneities, RF shapes robust against the field inhomogeneities can be obtained through numerical optimization based on optimal control theory. In this work, we designed optimal RF shapes to improve the performance of sodium IR MRI of the knee joint, in terms of fluid suppression, contrast between cartilage and artery, and SAR.

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