1 Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 43 Olympic-ro 88, Songpa-Gu, Seoul, 05505, South Korea.
2 Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 43 Olympic-ro 88, Songpa-Gu, Seoul, 05505, South Korea. radhskim@gmail.com.
3 JAPEX LLC, Seoul, South Korea.
4 Deparment of Neurosurgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, 05505, South Korea.
5 Philips Healthcare, Seoul, South Korea.
6 Department of Tomographic Imaging, Philips Research Laboratories, Hamburg, Germany.