Table 3.

Signal-to-Noise Ratio (SNR) and Contrast-to-Noise Ratio (CNR) of the MR Images of Rats Treated with Fe₃O₄@AuNPs at Different Time Intervals Post-Injection (Up to 14 Days)

Time Since Injection	SNR	CNR
Control	5.52	0.45
0 h	6.91	2.60
2 h	7.20	4.66
6 h	3.90	1.54
24 h	5.70	3.39
7 d	5.12	1.85
14 d	3.71	1.40

Notes: The signal intensity was measured on the slices presented in Figure 4A–G. The collecting points for each MR image are detailed in Supplementary Figure S2 (A-K).