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Table 2 Results of relaxometry for three nanoparticle contrast agents and Gd-DTPA

From: Synthesis route and three different core-shell impacts on magnetic characterization of gadolinium oxide-based nanoparticles as new contrast agents for molecular magnetic resonance imaging

Nanoparticle	r₂/r₁	r₂ (mM⁻¹ s⁻¹)	r₁ (mM⁻¹ s⁻¹)
Gd-DTPA	1.13	5.14	4.55
Gd₂O₃-DEG	0.89	11.81	13.31
SPGO-mPEG-silane550	33.34	26.34	0.79
SPGO-mPEG-silane2000	33.72	33.72	1.00

Longitudinal relaxivity (r₁) of Gd-DTPA PEGylated nanoparticles (SPGO-mPEG-silane550 and 2000) was smaller than that of Gd₂O₃-DEG.

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