In vivo porcine liver radiofrequency ablation with simultaneous MR temperature imaging

Journal of Magnetic Resonance Imaging : JMRI
Karl K VigenKim Butts Pauly

Abstract

To demonstrate in vivo MR-guided temperature mapping during radiofrequency (RF) ablation of the liver with a commercially available RF generator modified to allow simultaneous RF treatment and MRI. A commercial RF generator was modified using passive filtering to allow the continuous application of the treatment current during MRI studies. A total of six ablations were performed with the device in vivo in three porcine livers, and imaging was concurrently performed using one of two different temperature mapping strategies. MR images acquired during RF ablation demonstrated no noticeable interference from the RF ablation device, which was operated at clinically relevant power levels. Temperature maps showed areas of heating that were consistent with the dimensions of the RF ablation probe, with some asymmetry (likely depending on the orientation of the probe and heat propagation effects), and some differences in heating-spot area stability depending on the specific temperature mapping strategy used. Lesions were visualized on post-ablation imaging and sectioning. The feasibility of performing RF ablation with a modified commercial RF generator simultaneously with MRI was demonstrated. Interference-free MR temperature maps were p...Continue Reading

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Citations

May 19, 2010·Journal of Endourology·Raymond J Leveillee, Rajan Ramanathan
Apr 7, 2007·Topics in Magnetic Resonance Imaging : TMRI·Kim Butts PaulyGraham Sommer
Nov 6, 2007·Cancer Imaging : the Official Publication of the International Cancer Imaging Society·Alexandru CernicanuChristoph D Becker
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Apr 11, 2009·Seminars in Ultrasound, CT, and MR·Shu-Huei ShenClare Tempany
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