摘要
以Lunar公司DPX-L型双能X射线骨密度仪为例,研究引起测量误差的主要因素并提出质控措施。用自检模块、腰椎体模评定仪器的体外测量精度好于1%。对10位志愿者重复2次测量,体内精度对腰椎,MPD(平均百分差)为0.46,CV变异系数)为0.75;对股骨颈,MPD为1.26、CV为0.47;Ward’s三角区MPD为2.01、CV为1.14;大转子MPD为1.66、CV为0.72。扫描图像由2位技术人员分析比由同1人分析时的误差大。测量对象体位重复和分析技术的规范化,是减小测量误差的2个重要的技术保障。为满足数据比对的需要,建议建立我国自己的体模标准。
The influence of measuring procedure on precision in determing the bone mineral density (BMD) using dual energy X-ray absorptionmetry (DXA) is studied. The research results show that the position of measured subjects and the analysis of acqured images are two main influence facfors. The precision of BMD values obtained from images analysed by two technicians is lower than that by one technician. For DXA of Lunar DPX-L, the vitro precision is better than 1 %. The vivo precision expressed by coefficient of variation (CV) are 0. 75% at lumbar, 0. 47 % at neck, 1. 14 % at Ward's triangle and 0. 72 % at trochanter, respectively. A suggestion for establishment of standard phantom of our country is proposed in the paper.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1996年第3期230-235,共6页
Atomic Energy Science and Technology
关键词
骨密度
双能X线吸收术
体外精度
体内精度
Bone mineral density Dual energy X-ray absorptiometry Vitro precision Vivo precision