Lorena Petrusca1, Thomas Goget1,
Magalie Viallon1, Loredana Baboi1, Christoph Becker1,
Rares Salomir1
1Geneva University Hospital, Geneva,
Switzerland
Different
sonication patterns (i.e. trajectories of the focus) were performed ex-vivo
with a phased-array transducer: lines, unitary circles and concentric circles
of different lengths/diameters for comparison purpose. The temperature profile along the
ultrasound propagation axis was analyzed. For the same value of the line
length and circle diameter and identical applied powers and durations of
sonication, a significant drift of the maximum heating location below the
treatment plane towards the transducer was noticed for circle or disk
trajectories. Line scan sonications up to 24mm size provided symmetric and
drift-free thermal build up. The latter pattern should be considered for fast
and safe volumetric ablation with MRgHIFU.