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Abstract #1092

3D stack-of-stars MR thermometry sequence during hepatic microwave ablation: a phantom study with a commercially available microwave generator

Dominik Horstmann1, Bennet Hensen1, Karen Meyer zu Hartlage1, Daniel Luca Reimert1, Josef Joaquin Löning Caballero1, Frank Wacker1, and Marcel Gutberlet1
1Hannover Medical School, Hannover, Germany


A 3D stack-of-stars MR-thermometry sequence was developed and evaluated during hepatic microwave ablation in a chicken phantom. A commercially available microwave generator (MWG) working in pulsed mode controlled by a temperature sensor was used. Results show a spatially dependent phase-offset in the MR-image only during active ablation mode of the pulsed MWG impairing thermometry. Consequently, 73% of thermometry data were discarded for the fixed phantom yielding a temperature precision of 0.72°C±0.60°C whereas 94% were discarded for the moving phantom with an accuracy of 1.08°C±1.25°C. For clinical MR-thermometry, an MWG with less EMI is required to improve resolution and temperature precision.

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