TABLE 1

Ratio of Point Source 2 to Point Source 3 for Artificial Femoral Head and Hip Joint in Phantom

			Formula using threshold of…
Site	Without AC	Default formula	0.4	0.3	0.25	0.2	0.25 and 0.30	0.20 and 0.30
Artificial femoral head	0.72 ± 0.01^*	1.18 ± 0.03^*	1.14 ± 0.03^†	1.07 ± 0.03^†	1.02 ± 0.03^‡	0.93 ± 0.02^†	1.06 ± 0.02^‡	1.02 ± 0.02^‡
Artificial hip joint	0.68 ± 0.01^*	1.20 ± 0.02^*	1.18 ± 0.02^*	1.12 ± 0.02^*	1.06 ± 0.02^†	0.96 ± 0.02^‡	1.11 ± 0.02^*	1.04 ± 0.02^‡
VerSys Fiber Metal MidCoat	0.87 ± 0.02^*	1.11 ± 0.02^†	1.08 ± 0.02^†	1.02 ± 0.01^‡	0.98 ± 0.02^‡	0.92 ± 0.02^†	1.01 ± 0.02^‡	1.00 ± 0.02^‡
VerSys Fiber Metal Taper	0.85 ± 0.02^*	1.11 ± 0.02^†	1.08 ± 0.02^†	1.01 ± 0.02^‡	0.97 ± 0.02^‡	0.92 ± 0.02^†	1.01 ± 0.02^‡	0.98 ± 0.02^‡

↵* P < 0.01.
↵† P < 0.05.
↵‡ Not statistically significant (P ≥ 0.05).
AC = attenuation correction.