Temperature maps and measurements during treatment. (a) Temperature maps in two perpendicular planes at different time points (0, 10, 20, 30 and 40 min). The black contour is the 42° isotherm which corresponds well to the desired treatment region. (b) Mean, T90, and T10 temperatures within the target ROI. A tight temperature range was achieved and the body temperature curve confirmed the effectiveness of the warming tray.