Swanpalmer J, Kullenberg R, Hansson T
Department of Radiation Physics, Sahlgrenska University Hospital, Göteborg, Sweden.
Phys Med Biol. 1998 Feb;43(2):379-87. doi: 10.1088/0031-9155/43/2/012.
Our laboratory has previously reported a method of determining the amount of bone mineral using triple-energy absorptiometry with a continuous x-ray spectrum. In the present study, the experimental properties of the technique were examined. The accuracy, the influence of fat content and body thickness and the in vitro and in vivo precision were analysed. The results found in this investigation showed that despite the complexity of the technique, the amount of bone mineral can be accurately determined. The in vivo precision was determined to be 3.4%, expressed as the coefficient of variation (CV), for different skeletal parts. The in vitro precision was found to be 2.1% (CV). Neither the fat content nor the body thickness had any effect on the measured bone mineral values. Excellent linearity and a close correlation were found between the true and the measured bone mineral values.
我们实验室之前报道了一种使用具有连续X射线光谱的双能吸收法测定骨矿物质含量的方法。在本研究中，对该技术的实验特性进行了研究。分析了其准确性、脂肪含量和身体厚度的影响以及体外和体内精度。本次调查结果表明，尽管该技术复杂，但骨矿物质含量仍可准确测定。不同骨骼部位的体内精度经测定为3.4%，以变异系数（CV）表示。体外精度为2.1%（CV）。脂肪含量和身体厚度对测量的骨矿物质值均无影响。真实骨矿物质值与测量值之间呈现出良好的线性关系和紧密相关性。
