Cross-Calibration of Bone Mineral Densities and Body Composition Between GE-Lunar Prodigy and Osteosys Primus
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 formula between the two devices.Methods:The forty subjects were men and women in aged 20-29 years old. Study subjects with a body mass index (BMI) greater than or equal to 17 kg / m2 and less than or equal to 35 kg / m2with a negative pregnancy test at the time of screening, and participants who voluntarily participated and agreed to provide written consent were included in the study. The study exclusion criteria were patients with scoliosis, osteoarthritis, rigid vertebral osteomalacia, or other clinical vertebral deformities, adverse events after previous DXA or radiography, pregnant or lactating women, those with artificial pacemakers, or implanted cardiac pacemakers, and those with mental illnesses, such as severe depression. All participants were scanned twice on both the Osteosys Primus (OsteoSys, Seoul, Korea) and the GE-Lunar Prodigy (Madison, WI, USA) 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 % (1776.9 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 % (1045.3 g) in the total body, 3.8 % (179.4 g) in arms, and 7.7 % (1104.8 g) in legs, respectively. There were a strong correlation of BMD and body composition between both groups.Conclusion:There was a very high correlation of BMD and muscle mass between theOsteosys Primus and the GE Lunar Prodigy.