∗Correspondence: Kai Deng, 16766# Jingshi Road, Jinan, Shandong 250014, P.R. China (e-mail: 289954749@qq.com). Dr. Kai Deng is an expert in the field of radiology. He graduated from Peking University Health Science center and received his M.D. degree from Shandong University in 2009. Dr. Deng has worked as a visiting scholar in University of Southern California in 2013. Now he is serving as a vice director, associate chief physician and supervisor of postgraduate in the Department of Radiology, The First Affiliated Hospital of Shandong First Medial University. The main research areas of Dr. Deng include chest and abdominal imaging, especially the applications of spectral CT and functional MRI. Dr. Deng has published more than 30 papers in peer-reviewed journals as the first or corresponding author. Moreover, he is now a reviewer in the journal of MEDICINE.