In vivo quantification of SPIO nanoparticles for cell labeling based on MR phase gradient images.
Along with the development of modern imaging technologies, contrast agents play increasingly important roles in both clinical applications and scientific research. Super-paramagnetic iron oxide (SPIO) nanoparticles, a negative contrast agent, have been extensively used in magnetic resonance imaging (MRI), such as in vivo labeling and tracking of cells. However, there still remain many challenges, such as in vivo quantification of SPIO nanoparticles. In this work, an MR phase gradient-based method was proposed to quantify the SPIO nanoparticles. As a calibration, a phantom experiment using known concentrations (10, 25, 50, 100, 150 and 250 µg/ml) of SPIO was first conducted to verify the proposed quantification method. In a following in vivo experiment, C6 glioma cells labeled with SPIO nanoparticles were implanted into flanks of four mice, which were scanned 1-3 days post-injection for in vivo quantification of SPIO concentration. The results showed that the concentration of SPIO nanoparticles could be determined in both phantom and in vivo experiments using the developed MR phase gradients approach.
Center for Magnetic Resonance Research, University of Minnesota, Twin Cities, Minneapolis, MN, USA.
Luning
L
Wang
William M
WM
Potter
Qun
Q
Zhao
D000818:Animals; D058948:Cell Tracking / Q000379:methods; D003287:Contrast Media; D005290:Ferric Compounds; D005910:Glioma / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D058185:Magnetite Nanoparticles; D051379:Mice; D011859:Radiography
D003287:Contrast Media; D005290:Ferric Compounds; D058185:Magnetite Nanoparticles; C000499:ferric oxide
C6 glioma cells; magnetic resonance imaging; phase gradients; super-paramagnetic iron oxide nanoparticles