【摘要】 定量ＣＴ方法测定骨密度的优点是皮质骨和松质骨可被分别测定。这在临床上很有价值，因为松质骨的转换明显地高于皮质骨。定量ＣＴ分预处理法和后处理法两种。后者为医院常用，又可分为单能量法和双能量法两种。为降低剂量又有人设计了专用的外周型ＣＴ。采用图象处理可分区测定松质、皮质、亚皮质区的骨密度，还可进行骨网状结构分析。近年来，方法的改进主要在降低剂量，对复杂骨结构的三维处理和提高ＣＴ值定量精度等方面。更多还原

【Abstract】 The advantage of QCT method for measurement of bone mineral content is that, the cortical bone and cancellous bone can be measured separately, which is valuable, because the turnover-rate of cancellated bone is obviously higher then compact bone.QCT was separated to two kinds of method: preprocessing and postprocessing, the latter also was seperal ted to single-energy QCT and dual-energy QCT. In order to lower the dosimeter, special used periphera-CT have been designed. Using imaging processing, we can measure the mineral contents in cortical, trabe.culae and subcortical areas separately, also can analyse the trabeculate bone structure. Recently, the improvement of QCT method mainly was in reducing the dosimeter, 3D image processing for complicated bone structure and enhancing the accuracy of measuring CT value.更多还原