Abstract #2340
Near-field management during MR-HIFU ablation in highly perfused organs
Joost Wijlemans 1 , Martijn de Greef 2 , Gerald Schubert 3 , Maurice van den Bosch 1 , Chrit Moonen 2 , and Mario Ries 2
1
Dept. Radiology, UMC Utrecht, Utrecht,
Netherlands,
2
Image
Sciences Institute, UMC Utrecht, Utrecht, Netherlands,
3
Philips
Healthcare, Vantaa, Finland
During MR-HIFU ablation, heat accumulation in near-field
tissues (i.e. between transducer and target) can cause
thermal damage to healthy tissues. In seven porcine
liver ablation experiments we studied a strategy for
managing this risk. Active external tissue cooling was
used to reduce the risk of thermal damage, while T2
thermometry was used to monitor heat accumulation in
near-field tissues. This method can be used to adjust
the re-sonication intervals during the procedure,
reducing the risk of thermal damage while optimizing
ablation speed. Unlike modeling methods, this strategy
is effective regardless of ultrasound beam geometry,
near-field tissue composition, and perfusion variations.
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