Online Phase-Collection Based Correction of MR Thermometry for Breast HIFU Ablation: Evaluation Under Various Respiratory Motion Susceptibility Conditions in Phantom.

Matthieu Lepetit-Coiffe¹, Baudouin Denis de Senneville¹, Philippe Lourenco de Oliveira¹, Charles Mougenot¹, Bruno Quesson¹, Jean Palussiere¹, Chrit Moonen¹

An online phase-atlas based correction was evaluated regarding temperature accuracy improvement under various frequency and amplitude of respiratory motion conditions simulated thanks to a home made phantom. Fixed acoustic power and duration of High Intensity Focused Ultrasound (HIFU) was delivered during real time MR temperature acquisition in the respiratory mimicking phantom; Temperature maps were corrected with the proposed correction and results compared to temperature maps acquired under same HIFU delivery conditions without any perturbations.