Abstract #4275

Optimization of the kT-points placement under explicit SAR and power constraints in the large flip angle regime

Vincent Gras¹, Michel Luong², Alexis Amadon¹, and Nicolas Boulant¹

¹Neurospin, CEA/DSV/I2BM, Gif-sur-Yvette, France, ²IRFU, CEA/DSM, Gif-sur-Yvette, France

The k_T-points parametrization is a powerful technique to mitigate the RF inhomogeneity at ultra-high field which can also be used to achieve homogeneous non-selective inversion profiles with less SAR than adiabatic RF pulses. The large flip angle regime thus is an interesting domain of application of the k_T-points technique. However, to fully exploit it, it is necessary to optimize the placement of the k_T-points in k-space. In this work, the simultaneous optimization of the RF and k-space trajectory coefficients is proposed and validated, whereby SAR and power constraints are handled explicitly.

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