Fig. 4From: Excretable, ultrasmall hexagonal NaGdF4:Yb50% nanoparticles for bimodal imaging and radiosensitizationa Comparison of in vitro, longitudinal relaxivity values (r1), at 4.7 T for commercially available Gd-DTPA vs ultrasmall NaGdF4:Yb50% at 25 °C and 37 °C. b Pseudo-colored, T1-weighted MR image for saline, Gd-DTPA, and ultrasmall NaGdF4:Yb50%. Ultrasmall nanoparticles and Gd-DTPA samples contain the same concentration of Gd3+ (200 μM).Back to article page