1 Department of Radiology, School of Medicine, Canary Centre for Cancer Early Detection, Molecular Imaging Program at Stanford, Stanford University, Stanford, CA, USA.
2 Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA.
3 Department of Bioengineering, University of Washington, Seattle, WA, USA.
4 Department of Radiology, School of Medicine, Canary Centre for Cancer Early Detection, Molecular Imaging Program at Stanford, Stanford University, Stanford, CA, USA. sgambhir@stanford.edu.
5 Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA. sgambhir@stanford.edu.
6 Department of Bioengineering, Stanford University, Stanford, CA, USA. sgambhir@stanford.edu.
7 School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA. stas@gatech.edu.
8 Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, Atlanta, GA, USA. stas@gatech.edu.