1. Ultrasound System Hardware Laboratory and Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, 350-27 Gumi-Daero, Gumi, Gyeongbuk 35029, Republic of Korea
2. IMP System, 301-3ho 267-96 Gongdan2-dong, Gumi, Gyeongbuk 39373, Republic of Korea
3. Department of Biomedical Engineering, Gachon University, Incheon 21936, Republic of Korea