Louis O, Van den Winkel P, Covens P, Schoutens A, Osteaux M
Department of Radiology, Akademisch Ziekenhuis, Vrije Universiteit Brussel, Belgium.
Bone. 1992;13(4):317-20. doi: 10.1016/8756-3282(92)90076-9.
The bone mineral content of 34 lumbar vertebrae obtained from ten cadavers (three men, seven women; age 61-88 years) was measured using a pulsed source dual-energy X-ray absorptiometry (DEXA) apparatus. Scanning was performed in the frontal projection and was repeated on the vertebral bodies obtained after removal of the posterior elements of the vertebrae. Subsequently a nondestructive neutron activation analysis (NAA) was performed. The mineral content of the vertebral bodies was found to represent (mean, SEM) 53.0% (1.9%) of the content of the whole vertebrae. The mineral content of the vertebral bodies assessed with NAA (BMC NAA) and with DEXA (BMC DEXA) showed a high correlation: BMC NAAA = (1.016 x BMC DEXA) + 0.990 r = 0.949 (p less than 0.001). We conclude that the mineral content of lumbar vertebral bodies can be accurately measured in vitro in a water environment by DEXA, and that the mean contribution of the posterior elements of the vertebra to the calcium hydroxyapatite content of whole vertebrae measured in the frontal projection is as high as 47.0%.
使用脉冲源双能X线吸收法（DEXA）设备测量了从10具尸体（3名男性，7名女性；年龄61 - 88岁）获取的34个腰椎的骨矿物质含量。扫描在正位进行，并在去除椎体后部结构后获得的椎体上重复进行。随后进行了无损中子活化分析（NAA）。发现椎体的矿物质含量占整个椎体含量的（均值，标准误）53.0%（1.9%）。用NAA评估的椎体矿物质含量（BMC NAA）和用DEXA评估的椎体矿物质含量（BMC DEXA）显示出高度相关性：BMC NAAA =（1.016×BMC DEXA）+ 0.990，r = 0.949（p＜0.001）。我们得出结论，DEXA可在体外水环境中准确测量腰椎椎体的矿物质含量，并且在正位测量时，椎体后部结构对整个椎体羟基磷灰石含量的平均贡献高达47.0%。
