Figure 3

(a) A plot of R2 signal intensity versus nanocomposite microspheres concentrations in 1% agar phantoms and (inset) MRI T2-weighted images at TE = 32 ms showing the expected contrast effects by the nanocomposite microspheres in phantom and (b) Concentration versus CT signal (Hounsfield units, HU) curve of the nanocomposite microspheres. Inset shows CT images of the nanocomposite microspheres comparing with 1% agar phantoms.