J Bone Metab.  2021 Aug;28(3):215-221. 10.11005/jbm.2021.28.3.215.

Cross-Calibration of Bone Mineral Densities and Body Composition between GE Lunar Prodigy and Osteosys Primus

• Ha YC
• Yoo JI

• KMID: 2520182
• DOI: http://doi.org/10.11005/jbm.2021.28.3.215

Abstract

Background
The aim of this study was to investigate the correlation between bone mineral density (BMD) and body composition measured by the Osteosys Primus^® and the GE Lunar Prodigy^® and to calculate the conversion rate between the 2 devices.
Methods
The 40 subjects were men and women in aged 20 to 29 years old. All participants were scanned twice on both the Osteosys Primus (OsteoSys) and the GE Lunar Prodigy (GE Healthcare) DXA systems using the manufacturers’ standard scanning and positioning protocols.
Results
Compared to the GE Lunar device, the mean Osteosys fat mass was overestimated to be 12.1% (1,776.9 g) in the whole body, 5.1% (163.9 g) in gynoid, and 6.7% (87.2 g) in android. Compared with the GE Lunar device, the mean BMDs of the Osteosys Primus were underestimated to be 2.3% (0.023 g/cm²) in the whole body and 3.1% (0.035 g/cm²) in L1-4. Compared with the GE Lunar device, the mean lean mass derived by the Osteosys Primus were underestimated to 2.3% (1,045.3 g) in the total body, 3.8% (179.4 g) in arms, and 7.7% (1,104.8 g) in legs, respectively. There were a strong correlation of BMD and body composition between both groups.
Conclusions
Linear correction equations were developed to ensure comparability of BMD and muscle mass between the Osteosys Primus and the GE Lunar Prodigy. Importantly, use of equations from previous studies would have increased the discrepancy between the Osteosys Primus and the GE Lunar Prodigy.

Keyword

Absorptiometry; photon; Body composition; Bone density; Calibration