1. School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126 China
2. Ministry of Education, School of Life Science and Technology, Xidian University & Engineering Research Center of Molecular and Neuro Imaging, Xi’an, Shaanxi 710126, China
3. International Joint Research Center for Advanced Medical Imaging and Intelligent Diagnosis and Treatment & Xi’an Key Laboratory of Intelligent Sensing and Regulation of trans-Scale Life Information, School of Life Science and Technology, Xidian University, Xi’an, Shaanxi 710126, China
4. Departments of Diagnostic Radiology, Surgery, Chemical and Biomolecular Engineering, and Biomedical Engineering, Yong Loo Lin School of Medicine and Faculty of Engineering, National University of Singapore, Singapore 119074, Singapore