I. Introduction
Ultrasound imaging are known to be reliable imaging modality because of its trait of being real-time, non-invasive, ease of performance, non-toxicity, and low cost[1]–[3]. Due to its many positivity, ultrasound is a commonly used modality for diagnostic method. However, ultrasound images often suffer from reduced contrast and the interference of speckle noise, which complicates the interpretation of these images.