CONVERSION RELATIONS FOR QUANTITATIVE-CT BONE-MINERAL DENSITIES MEASURED WITH SOLID AND LIQUID CALIBRATION STANDARDS
CONVERSION RELATIONS FOR QUANTITATIVE-CT BONE-MINERAL DENSITIES MEASURED WITH SOLID AND LIQUID CALIBRATION STANDARDS
复制标题
DOI：
10.1016/0169-6009(92)90922-z
复制
发表时间：
1992-11-01
期刊：
影响因子：
--
通讯作者：
GOODSITT, MM
中科院分区：
文献类型：
--
作者：
GOODSITT, MM
存在大量的数据库，用于参照水（液体）标准中的K2HPO4进行骨矿物质密度（BMD）的QCT测量。为了有效地利用最近引入的水当量塑料（固体）标准中更稳定的羟基磷灰石，有必要推导出转换关系。进行了一项研究，以调查这些关系依赖于X射线管电压，骨髓成分，和病人的身体大小。测试对象包括三种不同尺寸腰椎模拟器内的五种不同组成的脊椎骨髓插入物和人形体模内的L1椎骨。校准标准品由Image Analysis制造，所有数据均用在80 kVp和140 kVp下操作的GE 9800 CT扫描仪采集。插入物的相应液体与固体参考BMD测量的最小二乘拟合都具有r>0.999。SEE，
A vast data base exists for QCT measurements of bone mineral density (BMD) referenced to K2HPO4 in water (liquid) standards. To effectively utilize the more stable hydroxyapatite in water-equivalent plastic (solid) standards that have recently been introduced, it will be necessary to derive conversion relations. A study was performed to investigate the dependence of these relations upon x-ray tube voltage, marrow composition, and patient body size. Test objects included five diverse composition vertebral marrow inserts within three different size lumbar simulators and an L1 vertebra within a Humanoid phantom. The calibration standards were manufactured by Image Analysis, and all data were acquired with a GE 9800 CT scanner operated at 80 kVp and 140 kVp. Least square fits to corresponding liquid versus solid referenced BMD measurements of the inserts all had r's >0.999. SEEs,