PRF Based MR-Thermometry on Abdominal Organs: A Pragmatic Comparison of Referenceless Vs Multi-Baseline

Baudouin Denis de Senneville¹, Sbastien Roujol^1,2, Chrit Moonen¹, Mario Ries¹

Reliable temperature and thermal-dose measurements using PRF based MR-thermometry for MR-guided ablation therapy on abdominal organs require a robust correction of artefacts induced by the target displacement through an inhomogeneous and time-variant magnetic field. The presented study combines the two most promising candidates for this role, the multi-baseline and the referenceless method, with a real-time in-plane motion correction which permits thermal-dose calculations and evaluates the practical aspects of both methods in an ex-vivo RF-ablation and an in-vivo high-intensity focused ultrasound ablation of a porcine kidney.