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RF energy is electrical energy delivered in a very condensed manner. When these waves come into contact with resistance, a solid object of some type, the waves cause excitement in the molecules of the solid. This excitement causes the solid to heat. This is referred to as resistive heating. The radio waves themselves do not conduct heat; it is the resistance to these waves in the surrounding tissue that causes resistive heating. This method allows very controlled and efficient heating of the vein wall. Example of Resistive Heating  A light bulb is a good example of resistive heating. In a light bulb the higher impedance filament resists the energy flow and causes heating (light). The electrical energy (RF) flows from the positive to the negative electrodes. |
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Ultrasound