Fig. 1.
Example of the thermal effective field size (TEFS). Calculated normalized temperature rise (TR) distribution at 1 cm depth in a two-layered phantom, with fat layer thickness of 10 mm overlying the muscle phantom. Heating time t = 6 min, P = 175 W. The black solid line indicates the applicator aperture, while the black dashed line represents the water bolus. The maximum TR in the 1 cm deep plane in muscle-tissue equivalent phantom is Tmax1cm = 7.6 °C. The TEFS isotherm then quantifies the area with TR ≥ 3.8 °C