1 Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN, 55905, USA; Department of Biomedical Engineering and Physiology, Mayo Clinic, 200 1st St SW, Rochester, MN, 55905, USA.
2 Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN, 55905, USA.
3 Siemens Medical Solutions, 40 Liberty Boulevard, Malvern, PA 19355, USA.
4 Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN, 55905, USA. Electronic address: Leng.shuai@mayo.edu.