Cobben J J, Kok T, Vijverberg G P
J Belge Radiol. 1989 Apr;72(2):101-6.
Fluctuations are observed in CT densitometry of cancellous bone of the lumbar vertebra in relation to age and sex and also per age/sex group. An investigation was carried out in 119 patients to possibly detect comparable fluctuations in CT measurements of other tissues. The spongiosa of the fourth lumbar vertebra, the abdominal aorta, paravertebral fat and the ratio fat volume/total irradiated volume were compared in the slice plane through the middle of the fourth lumbar vertebra. Calibration was performed using a water phantom. A correlation between the mentioned parameters could not be demonstrated. The relation between Bone Mineral Density (BMD) and age and sex showed the same values as known from the literature, being representative for a normal population. Using the aorta as a reference (which in fact is related to water) a similar curve is found as in Cann and Cann et al. The density of the aorta showed a constant value, varying between 38 and 50 HU with a mean of 45 HU. Extreme values were only found with streak artefacts. It seems useful to use the aorta values as a reference to measure the relative value of vertebral cancellous bone.
观察到腰椎松质骨的CT密度测定值随年龄和性别以及每个年龄/性别组而波动。对119名患者进行了一项调查，以检测其他组织的CT测量中是否存在类似的波动。在通过第四腰椎中部的切片平面中，比较了第四腰椎的海绵体、腹主动脉、椎旁脂肪以及脂肪体积/总照射体积的比率。使用水模体进行校准。未证明上述参数之间存在相关性。骨密度（BMD）与年龄和性别的关系显示出与文献中已知的值相同，代表正常人群。以主动脉作为参考（实际上与水相关），发现与Cann和Cann等人的研究结果类似的曲线。主动脉的密度显示出恒定值，在38至50 HU之间变化，平均值为45 HU。仅在条纹伪影时出现极值。将主动脉值用作参考来测量椎体松质骨的相对值似乎是有用的。
