Hypothesis: MR-ARFI can be deployed in the kidney as an alternative for the thermal test shot at low power.
The employed respiratory gated MR-ARFI sequence in combination with a 450 W excitation tone-burst is sensitive enough to exceed the noise level and to clearly display the focal point of the HIFU beam. Both at 450W and at 1000W the displacement due to the radiation force coincided with the location of the temperature rise due to thermal ablation at equivalent power. Hence, radiation force in combination with a pencil beam navigator to compensate for respiratory motion is a reliable indicator of the location of the thermal lesion and might be an alternative to the low power thermal test shot in highly perfused organs such as the kidney.
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