Department of Oral and Maxillofacial Surgery, Technische Universität München, Klinikum rechts der Isar, Ismaninger Str. 22, D-81675 München, Germany.
J Craniomaxillofac Surg. 2011 Jul;39(5):330-4. doi: 10.1016/j.jcms.2010.10.002. Epub 2010 Oct 27.
Modified quantitative computed tomography is a method used to predict bone quality and quantify the bone mass of the jaw. The aim of this study was to determine whether bone quantity or quality was detected by cone beam computed tomography (CBCT) combined with image analysis. MATERIALS AND PROCEDURES: Different measurements recorded on two phantoms (Siemens phantom, Comac phantom) were evaluated on images taken with the Somatom VolumeZoom (Siemens Medical Solutions, Erlangen, Germany) and the NewTom 9000 (NIM s.r.l., Verona, Italy) in order to calculate a calibration curve. The spatial relationships of six sample cylinders and the repositioning from four pig skull halves relative to adjacent defined anatomical structures were assessed by means of three-dimensional visualization software.
The calibration curves for computer tomography (CT) and cone beam computer tomography (CBCT) using the Siemens phantom showed linear correlation in both modalities between the Hounsfield Units (HU) and bone morphology. A correction factor for CBCT was calculated. Exact information about the micromorphology of the bone cylinders was only available using of micro computer tomography.
Cone-beam computer tomography is a suitable choice for analysing bone mass, but, it does not give any information about bone quality.
改良定量计算机断层扫描是一种用于预测骨质量和量化颌骨骨量的方法。本研究旨在确定锥形束计算机断层扫描（CBCT）结合图像分析检测到的是骨量还是骨质量。
在西门子 Phantom 和 Comac Phantom 两个体模上记录不同的测量值，并在 Somatom VolumeZoom（德国西门子医疗解决方案公司，Erlangen）和 NewTom 9000（意大利 NIM s.r.l.，Verona）上拍摄的图像上进行评估，以计算校准曲线。使用三维可视化软件评估六个样本圆柱体的空间关系和四个猪颅骨半部分相对于相邻定义的解剖结构的重新定位。
使用西门子体模的计算机断层扫描（CT）和锥形束计算机断层扫描（CBCT）的校准曲线在两种模式下均显示出亨氏单位（HU）和骨形态之间的线性相关性。计算了 CBCT 的校正因子。只有使用微计算机断层扫描才能获得有关骨圆柱体微观形态的准确信息。
锥形束计算机断层扫描是分析骨量的合适选择，但它不能提供任何关于骨质量的信息。
