Fig. 2
a A representative example of a 3D positive acoustic pressure field map within a 5 × 5 × 20 mm3 volume. The average offsets between the projected and identified fiber tip location over three repeated measurements were 0.7 ± 1.2 mm, 2.0 ± 0.5 mm, and 0.7 ± 0.3 mm along the X, Y, and Z axes, respectively, resulting in an average 3D offset of 2.23 ± 1.33 mm. b A representative example of a 3D positive acoustic pressure field map within a 1.5 × 1.5 × 15 mm3 volume after the transducer was repositioned to correct for the offset. Both measurements were acquired inside the MRI bore and performed at an acoustic power of 100 W, and the pressure maps were linearly interpolated with an interpolation factor of 10