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Fig. 3 | Journal of Therapeutic Ultrasound

Fig. 3

From: Assessing heating distribution by therapeutic ultrasound on bone phantoms and in vitro human samples using infrared thermography

Fig. 3

Image processing algorithm. a The original image is obtained as a matrix with 140 × 140 pixels, and each pixel is represented by a temperature value, as captured by the infrared camera. b A contrast enhancement of the normalized gray-scale image using histogram equalization is performed, and the user is able to correctly select the ROI. c Zoom of the selected ROI. d After the determination of an intensity threshold, the algorithm separates and binarizes (turns image pixels in black and white) the heating area from the background. e Once the heating area is isolated, the histogram with the temperatures inside the ROI is depicted, and X T and SDT can be estimated (using the temperature data from the original image)

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