Figure 2 | Scientific Reports

Figure 2

From: Classification of malignant tumours in breast ultrasound using unsupervised machine learning approaches

Figure 2

Visualised extracted feature vector from a benign US image by Histogram of Oriented Gradient (HOG). The probably benign (BI-RADS category 3) case: female, age 78 years, a left breast hypoechoic tumour was found and reported by ultrasound imaging, size: 11.7 × 6 mm, location: 2 o’clock from the nipple, distance: 2 cm from the nipple to the lesion. The fibroadenoma lesion was confirmed after a core needle biopsy, size: 1.2 × 0.1 × 0.1 cm. The extracted feature vectors through the HOG descriptor from the image are shown as corner points. (a) The US image of this case. (b) Green marks represent the positions of corner points obtained from the accelerated segment test (FAST).

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