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KMID : 1007020080060010023
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Korean Soceity of Osteroporosis
2008 Volume.6 No. 1 p.23 ~ p.32
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Cross-calibration of GE Lunar Expert and GE Lunar Prodigy Advance for Bone Mineral Density Measurements
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Choi Yong-Jun
Chung Yoon-Sok
Lee Kwan-Woo
Kim Dae-Jung
Kim Hae-Jin
Lee Byung-Joo
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Abstract
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Objectives: Wide fan beam dual-energy X-ray absorptiometry(DXA) is replaced with narrow fan beam DXA. However, information has been lacking regarding the cross calibration of bone mineral density(BMD) between two devices. We have compared BMD using narrow fan beam(GE Lunar Prodigy Advance, Prodigy) and wide fan beam(GE Lunar Expert, Expert) instruments.
Methods: Lumbar spine and hip DXA scans were performed in 96 patients(82 female, 14 male) on the same day on both devices. European spine phantom(ESP), two lunar spine phantom were also measured for in vitro cross calibration
Results: L1-L4, femoral trochanter, total femur BMD were significant different between two devices, but the differences were small. Regression analysis between two devices revealed close correlation and the values for r2 are all nearly 1.0. However, after Bland and Altman analysis, Expert and Prodigy could not be interchangeable. The phantom calibration was not close to the in vivo calibration at the spine.
Conclusion: When replacing Expert with Prodigy, in vivo cross calibration has to be performed.
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KEYWORD
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Bone mineral densitometry, Cross calibration, DXA, GE lunar expert, GE lunar prodigy
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