Table 1.

Quantification of the hydroxyapatite measured with the three-material phantoms. PMMA=polymethylmethacrylate, PE=polyethylene, and POM=polyoxymethylene.

Known HA (mg∕ml)	Measured HA (mg∕ml)			Error (%)
	PMMA	PE	POM	PMMA	PE	POM
50	37	45	34	25.96	9.75	31.97
150	147	158	138	2.18	5.51	7.72
250	265	269	233	6.14	7.47	6.65
350	360	374	331	2.78	6.77	5.36
		Average error		9.26	7.37	12.93