ELECTRONIC BEAM STEERING USED WITH ATOROIDAL HIFU TRANSDUCER SUBSTANTIALLY INCREASES THE COAGULATED VOLUME JEREMYVINCENOT,DAVIDMELODELIMA,FRANCOISECHAVRIER,ALEXANDREVIGNOT,ANTHONYKOCOT,

lated volume. When all the elements are working in phase for 40 s, a volume of 6–8 cm 3 can be ablated. However, the mechanical juxtaposition of single lesions is still necessary for treating one tumor with a diameter of 2 cm. The objective of this study was to combine this toroidal transducer geometry with electronic beam steering to ablate tumors with adequate normal tissue margins and without any mechanical displacement of the high-intensity focused ultrasound device. In vitro tests demonstrated that the coagulated volume obtained from 130 s of total exposure has an average diameter of 41.4 ± 4.0 mm and an average length of 53.3 ± 6.1 mm. This single lesion can be used to treat various size of metastasis, located at depths in the liver ranging 5–45 mm. (E-mail: Jeremy. Vincenot@inserm.fr) 2013 World Federation for Ultrasound in Medicine & Biology.

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