In both cases (raw data and B-mode), the freehand acquisition should allow for palpation (manual compression within few millimeters). Risks and discomforts are negligible: Interventional ultrasound is FDA-approved, and we will use only the data resulting from standard of care use of clinically certified equipment. The maximum length of a data recording session will be 1-2 minutes during standard ultrasound acquisition. We will acquire cine sequences for five defined periods: 1) tumor imaging before probe placement; 2) immediately after probe placement; 3) near completion during ablation; 4) two minutes following ablation with probe in place; and 5) after removing the ablator probe.