摘要
目的确定使用双能X线吸收法(DXA)在测定全身和局部身体成份短期精确度,以指导临床监测方案。方法对10名成年女性志愿者使用DXA(GE LUNAR PRODIGY型)骨密度仪进行了全身体成份测定。每名志愿者测量10次,每天重复5次分在2d(间隔不超过4d)中进行。志愿者测量期间饮食、运动等无明显改变,无腹泻等影响体重的疾病。每次测试需穿同样衣服,每次测量结束均离开骨密度仪,站到地面,下次测量再重新摆放体位。由同一名技师进行操作并分析。计算短期精确度。结果全身、上肢、大腿、躯干、男性区域及女性区域骨矿含量测定的变异系数(CV)分别为1.1%、1.5%、0.9%、2.8%、3.4%和1.7%,脂肪测定的CV分别为1.2%、3.5%、2.3%、2.7%、3.4%和1.8%,组织测定的CV分别为0.7%、1.4%、1.8%、1.6%、2.2%和1.4%,脂肪百分比的CV分别为1.2%、2.4%、1.1%、2.1%、2.3%和1.5%。结论全身体成份测定的CV在0.7%～1.2%,局部体成份测定的CV大部分在1%～2.5%之间。局部测定的精确度不如全身测定的精确度。全身测定和局部测定的精确度均可以满足临床和科研需要。
Objective To have clinical confidence on treatment and monitor with dual-energy X-ray absorptiometry （DXA, GE LUNAR PRODIGY） for total body bone mineral density （BMD） and body composition. Methods Ten female adult volunteers were scanned 10 times repeatedly, separately scanned in 2 different days （interval less than 4 days） using DXA （GE Lunar Prodigy）. No any known illness could have affected BMD or body composition over the short term. The volunteers moved off and onto the scanner between each scan. All scans were acquired and analyzed by the same experienced operator. Precision was calculated using the root-mean-square methodology.Results BMC precision was 1.1% for total body, 1.5% for ann, 0.9% for leg, 2.8% for trunk, 3.4% for android region, 1.7% for gynoid region respectively. In turn, fat precision was 1.2%, 3.5%, 2.3%, 2.7%, 3.4% and 1.8%, lean mass precision was 0.7%, 1.4%, 1.8%, 1.6%, 2.2% and 1.4%, percentage fat precision was 1.2%, 2.4%, 1.1%, 2.1%, 2.3% and 1.5%. Conclusions Total body precision was 0.7% - 1.2% and regional body precision was 1% -2.5% mostly. Regional body precision errors were generally greater than that of the total （ arms, legs and trunk） measurement sites. DXA is a rapid, precise and accurate method for measurement of regional and total body composition.
出处
《中国骨质疏松杂志》
CAS
CSCD
2007年第4期272-273,262,共3页
Chinese Journal of Osteoporosis
关键词
精确度
身体成份
双能X线吸收法
骨密度仪
Precision
Body composition
Dual-energy X-ray absorptiometry（DXA）
Densitomery
