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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: IEEE Trans Biomed Eng. 2014 Sep 15;62(2):450–457. doi: 10.1109/TBME.2014.2358075

Fig. 2.

Fig. 2

Adaptive filter configuration. N observation points are selected outside the heated region based on pre-heating analysis of tissue motions and deformations (Green dots). A temperature reference point is selected from the heated region (Red dot) based on the target of the focus and/or the analysis of the initial heating rate immediately after the HIFU pulse is applied. The error function shown in the schematics controls the adaptation according to NLMS method [22],[23].