Yibin Xie1, Steven M. Shea2,
Yingli Fu3, Wesley D. Gilson2, Tina Ehtiati2,
Ronald Ouwerkerk4, Dorota Kedziorek3, Meiyappan
1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, United States; 2Center for Applied Medical Imaging, Siemens Research Corporate, Inc., Baltimore, MD, United States; 3Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, MD, United States; 4National Institutes of Health, Bethesda, MD, United States
The delivery and engraftment of therapeutic stem cells can be monitored by both 19F MRI and c-arm CT using alginate-poly-L-lysine-alginate microcapsules loaded with perfluorooctylbromide (APA-PFOB). MR tracking is advantageous for high sensitivity and absence of ionizing radiation. However it suffers from lower resolution. This study evaluates accuracy of tracking encapsulated mesenchymal stem cells using 19F MRI relative to c-arm CT. Results show a high identification and agreement in the spatial locations and volumes of the injection sites between MRI and CT demonstrating that MRI provides an accurate alternative to CT for tracking of encapsulated stem cells in vivo.