Laval-Jeantet M, Laval-Jeantet A M, Lamarque J L, Demoulin B
J Radiol. 1979 Feb;60(2):87-93.
Computerized tomography ("tomodensitometry") should, in principle, be able to calculate the linear attenuation coefficient of a compact or spongy bone volume. This coefficient is related to the amount of mineralization, enabling the use of the Scanner X to measure the density of the bone. Thirty vertebrae from the vertebral columns of 14 subjects who died after acute infections were examined by C.T. and by standard methods, and then calcinified. The correlation between ashes weight-Houns-field number was positive but only moderate (r = 0.54), and lower than the result obtained (r = 0.84) with standard methods. Errors occur with presently used apparatuses which are related to: polychromatism, too high an energy of the beam, artefacts, and the effects of "partial volume". Futhermore, the mineral concentration by unit of vertebral volume is very low, and large variations must occur for it to be detectable. Finally, considerable errors arise from the intravertebral bone fat. Suggestions are made with the objective of improving the quality of C.T. as a measuring instrument.
计算机断层扫描（“体层密度测定法”）原则上应能够计算致密或松质骨体积的线性衰减系数。该系数与矿化量相关，使得能够使用X线扫描仪来测量骨密度。对14名急性感染后死亡受试者的脊柱中的30个椎骨进行了CT检查和标准方法检查，然后进行钙化处理。骨灰重量与亨氏单位数之间的相关性为正，但仅为中等程度（r = 0.54），且低于用标准方法获得的结果（r = 0.84）。当前使用的设备会出现一些误差，这些误差与以下因素有关：多色性、过高的射线能量、伪影以及“部分容积”效应。此外，单位椎骨体积的矿物质浓度非常低，必须出现很大变化才能被检测到。最后，椎骨内骨脂肪会产生相当大的误差。针对提高CT作为测量仪器的质量提出了一些建议。
