A new measurement tool, the automated software CoreScan, for the GE Lunar iDXA, has been validated for measuring visceral adipose tissue (VAT) against computed tomography in normal weight populations. However, no study has evaluated the precision of CoreScan in measuring VAT among severely obese patients.
Purpose: The purpose of the study is to evaluate the precision of CoreScan for VAT measurements in severely obese adults (BMI >40 kg/m2).
Methods: 55 obese participants with a mean age of 46+/-11yrs, BMI of 49+/-6 kg/m2, and body mass of 137.3+/-21.3 kg took part in this study. Two consecutive iDXA scans with repositioning of the total body were conducted for each participant. The coefficient of variation (CV), the root-mean square (RMS) averages of standard deviations of repeated measurements, the corresponding 95% least significant change, and Intraclass Correlations (ICC) were calculated.
Results: Precision error was 8.77% (%CV) with an RMS SD of .294kg and an ICC of 0.96. Bland-Altman plots demonstrated a mean precision bias of -0.08+/-.41 kg giving a Coefficient of Repeatability of 0.82kg and a bias range of (-.890 to 0.725 kg).
Conclusions: When interpreting visceral adipose tissue results with the iDXA in severely obese populations, clinicians should be aware of the precision error for this important clinical parameter.
(C) 2014 American College of Sports Medicine