TABLE 1.

Comparison of A+B/G and D+F/G Ratios Between Carbon and XPS Headrests in Healthy Controls (n = 10)

	A+B/G			D+F/G
Parameter	Carbon	XPS	P	Carbon	XPS	P
FBP Chang AC	0.97 ± 0.02	0.93 ± 0.02	<0.001^*	0.89 ± 0.02	0.89 ± 0.02	0.173
OSEM Chang AC	0.98 ± 0.04	0.94 ± 0.02	<0.001^*	0.90 ± 0.02	0.90 ± 0.02	0.423
OSEM CTAC	0.91 ± 0.02	0.91 ± 0.02	0.322	0.88 ± 0.01	0.88 ± 0.01	0.037

↵* Statistically significant.