Cross-Calibration of GE Healthcare Lunar Prodigy and iDXA Dual-Energy X-Ray Densitometers for Bone Mineral Measurements

Table 1

Mean (SD) values and short-term precisions (CV% = (SD/mean) × 100%) for repeated phantom (in vitro) measurements at L2–L4 (), as measured by GE Healthcare Lunar Prodigy and iDXA. Lunar, ESP, and Hologic phantoms were included. Bone mineral values differed significantly between Prodigy and iDXA. Discordant results were obtained with different phantoms.

Phantom		Prodigy			iDXA
		BMD	BMC	AREA	BMD	BMC	AREA
Lunar	Mean (SD)	1.198 (0.005)	61.47 (0.16)	51.34 (0.12)	1.203 (0.002)	61.24 (0.10)	51.76 (0.04)
	CV%	0.38	0.25	0.23	0.13	0.17	0.08
ESP	Mean (SD)	1.083 (0.005)	30.30 (0.20)	27.97 (0.17)	1.095 (0.005)	31.22 (0.15)	28.51 (0.15)
	CV%	0.50	0.67	0.60	0.42	0.49	0.51
Hologic	Mean (SD)	1.165 (0.004)	47.06 (0.19)	40.40 (0.08)	1.161 (0.003)	46.74 (0.12)	40.27 (0.06)
	CV%	0.34	0.39	0.20	0.26	0.26	0.16

Bone mineral density (g/cm²), bone mineral content (g), and area (cm²) of the L2–L4 region of interest.
Paired samples -test Prodigy versus iDXA ().