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Figure 1 | Journal of Therapeutic Ultrasound

Figure 1

From: Volume reduction of benign thyroid nodules 3 months after a single treatment with high-intensity focused ultrasound (HIFU)

Figure 1

Visual feedback during initial test pulse. During initial test pulses, beam intensity was set to be just below the point where the generation of a so-called hyperechoic mark (HEM) indicates temperatures above 80°C–90°C. This mark is visible in B-mode US due to the hyperechogenic character of microbubbles. These consist of steam. Shown is an exemplary nodule before (A) and directly after (B) such a test pulse. Clearly visible is the HEM, which vanishes within seconds afterwards.

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