1. Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 South Korea
2. Radiology and Center for Imaging Science Samsung Medical Center Sungkyunkwan University School of Medicine Seoul 06351 South Korea
3. RF Medical Co. Ltd. Seoul 08511 South Korea
4. Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences & Technology (SAIHST) Sungkyunkwan University School of Medicine Seoul 06355 South Korea