Transverse relaxivity of iron oxide nanocrystals clustered in nanoemulsions: Experiment and theory.

Purpose: To compare experimental transverse relaxivities of iron oxide nanocrystals (IONC) as a function of clustering and magnetic field strength with different theoretical model predictions.

Theory And Methods: Well-defined IONC clusters in nanoemulsions (NEs) of which both size and IONC loading could be judiciously tuned were developed. Transverse relaxivities were measured as a function of NE size and IONC loading at 20 and 300 MHz and compared with four theoretical model predictions.