Table 1.

Signal enhancements over water for 10 nm AuNP-PEG and 10 nm SPION-PEG as measured from SFHI x-ray scatter and x-ray absorbance images.

[metal] (ppm)	x-ray absorbance signal enhancement (%)		x-ray scatter signal enhancement (%)
	10 nm AuNP-PEG	10 nm SPION-PEG	10 nm AuNP-PEG	10 nm SPION-PEG
250	0.7 ± 0.03	0.5 ± 0.01	4.6 ± 0.23	6.1 ± <0.01
500	0.7 ± 0.01	0.6 ± 0.01	8.0 ± 0.47	7.6 ± 0.65
750	0.9 ± <0.01	0.6 ± <0.01	9.1 ± <0.01	7.9 ± 0.63
1000	1.0 ± 0.01	0.6 ± 0.01	12.0 ± 0.02	9.7 ± 0.24