Precision Assessment of the Radiological Technologists for the Measurement of Bone Mineral Density in Adults with Densitometer at Rajavithi Hospital
Keywords:
Bone mineral density, Precision assessment, Least significant change (LSC)Abstract
Background: Precision is integral to the monitoring of bone mineral density (BMD) change using dual energy X - ray absorptiometry (DXA). The International Society for Clinical Densitometry (ISCD) stated that in addition to evaluate the accuracy of a DXA, the radiological technologist’s precision assessment of BMD measurement is also required. Objective: To assess the radiological technologists’s precision of the BMD measurement for lumbar spine, femoral neck, total hip and forearm in adults at Rajavithi Hospital. Method: This study examined BMD measurement of 240 participants with a mean age 62.76 yr (SD = 8.85; range 45 - 90 yrs) for lumbar spine, femoral neck, total hip, and forearm by 8 technologists. Each technologist measured 30 participants twice by reposition, then the precision error (percent coefficient of variation; %CV) and 95% the least significant change (LSC) were calculated and analyzed statistically. Result: There were statistically significant correlation in all sites (0.994-0.998, p value < .05) for two BMD measurements. The precision error of BMD measurement by 8 technologists gave high precision in total hip, lumbar spine and femoral neck (%CV: 0.76%, 0.85%, and 1.10% respectively) and within the ISCD criteria. The region with the highest error was the forearm (%CV:1.46%) but still represented good reproducibility. When the participants were grouped by body mass index (BMI), lumbar spine and femoral neck were found to be the highest error in the BMI > 25.0 kg/m2 (%CV: 0.90% and 1.22%, respectively), but total hip and forearm regions were found to be the highest error in the BMI < 18.5 kg/m2 (%CV: 1.08% and 2.41%, respectively). There were statistically significant differences of precision error between technologists in all sites, but between different BMI groups, there were no statistically significant differences in all sites. Conclusion: The precision assessment of BMD measurement by all technologists had high precision and were within the ISCD criteria.
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