DUAL-ENERGY X-RAY ABSORPTIOMETRY FOR TOTAL-BODY AND REGIONAL BONE-MINERAL AND SOFT-TISSUE COMPOSITION
DUAL-ENERGY X-RAY ABSORPTIOMETRY FOR TOTAL-BODY AND REGIONAL BONE-MINERAL AND SOFT-TISSUE COMPOSITION
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DOI：
10.1093/ajcn/51.6.1106
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发表时间：
1990-06-01
影响因子：
7.1
通讯作者：
HANSON, J
中科院分区：
文献类型：
--
作者：
MAZESS, RB;BARDEN, HS;HANSON, J
用双能X线骨密度仪(DEXA)测量全身和主要亚区的骨密度(BMD)和软组织成分。对12名青壮年(男6名，女6名)进行了5次中速(20min)和快速(10min)全身扫描。两种速度的平均结果或精度误差没有显著差异。总BMD、软组织脂肪百分比(%Fat)、脂肪质量和瘦组织质量的精密度误差(1SD)分别为0.01g/cm2、1.4%、1.0 kg和0.8 kg。这些结果与全身骨密度和瘦体重的相对误差为0.8%相对应。区域骨密度和软组织值(手臂、腿部、躯干)的测定精度略高。骨矿含量为5.8.+-。瘦组织质量的0.5%(r=0.96p<；0.001)。DEXA提供精确的成分分析和低辐射暴露(<；0.1u.Gy.)。
Bone mineral density (BMD) and soft-tissue composition of the total body and major subregions were measured with dual-energy x-ray absorptiometry (DEXA). Total body scans were made in 12 young adults (6 male, 6 female) on five occasions at both a medium speed (20 min) and a fast speed (10 min). There were no significant differences in mean results or in precision errors between the two speeds. The precision errors (1 SD) for total body BMD, percent fat in soft tissue (% Fat), fat mass and lean tissue mass were < 0.01 g/cm2, 1.4%, 1.0 kg, and 0.8 kg, respectively. These results corresponded to a relative error of 0.8% for total body BMD and for lean body mass. Regional BMD and soft-tissue values (arms, legs, trunk) were determined with slightly higher precision errors. Skeletal mineral was 5.8 .+-. 0.5% of lean tissue mass (r = 0.96, p < 0.001). DEXA provides precise composition analysis with a low radiation exposure (< 0.1 .mu.Gy).