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. 2020 Sep 4;10:1690. doi: 10.3389/fonc.2020.01690

FIGURE 5.

FIGURE 5

Illustrative representation of the two heating principles. (A) Isothermal (homogeneous) heating causes energy-absorption in the complete target, while in (B) non-isothermal heating only selected parts are heated in a heterogenic manner. The selected parts that are heated are either unique characteristics of the tumor which respond to a stimulation by heating up, or nano-particles which are introduced into the tumor and which respond to a stimulus by heating up. These heated targets then heat up the target volume by heat conduction.