Short echo time dual-frequency MR Elastography with Optimal Control RF pulses

Pilar Sango Solanas (1) , Kevin Tse Ve Koon (1) , Eric van Reeth (1) , Cyrielle Caussy (2) , Olivier Beuf (1)

1 RMN et optique : De la mesure au biomarqueur
2 CarMeN - Cardiovasculaire, métabolisme, diabétologie et nutrition

Magnetic Resonance Elastography (MRE) quantifies the mechanical properties of tissues, typically applying motion encoding gradients (MEG). High frequencies are difficult to reach due to slew rate limitations and low frequencies induce too long TEs, yielding magnitude images with low SNR. Multifrequency results allow better characterizations of tissues using data usually acquired through sequential monofrequency experiments. In this study, we generate optimal control-based RF pulses to outperform simultaneous multifrequency MRE. The pulse is applied with a constant gradient during the mechanical excitation to simultaneously achieve spatially selective excitation and motion encoding. Results on phantom demonstrated the feasibility of the proposed method.

Domaines: Imagerie

Pilar Sango Solanas, Kevin Tse Ve Koon, Eric van Reeth, Cyrielle Caussy, Olivier Beuf. Short echo time dual-frequency MR Elastography with Optimal Control RF pulses. 2021 ISMRM & SMRT Annual Meeting & Exhibition, May 2021, Online, France. ⟨hal-03160648⟩