Measuring System for Bone Mineral Content by Panoramic Radiography

全景X线骨矿物质含量测量系统

基本信息

批准号：
11557148
负责人：
KOBAYASHI Kenichi
金额：
$ 3.01万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11557148/
关键词：
bone mineral density digital imaging

项目摘要

The investigation of bone mineral content(BMC) is useful for osteoporosis screening and for accurate prognosis for implant treatment. BMC was measured by special devices, as quantitative computed tomography. In this study, BMC measuring system was improved by using panoramic X-ray system to obtain overall coverage of the dental arches and associated structures at a time. We surveyed the measuring performance of this system.We applied bone phantom to reference and test stepwedges, X500CR(Morita Co.Ltd.) to panoramic X-ray system and Denoptix digital imaging system ( Dentsply Co. Ltd.) to image input device. The exposure condition was 60kV, 10mAs. The reference stepwedge was fixed at left side on image layer, the position of test stepwedge was changed as followings 1)inside or outside of the layer, 2) in premolar or molar region. We verified the measuring accuracy and reproducibility of this system at each condition.Measured value in molar region was higher than that in premolar region. The variation of measured value depended on the measuring position. The accuracy of adjusted RMET value was 1.25%(relative error). The difference in the magnification between in the mesial and the distal region was detected. The conversion corresponding with the position in mandible decreased the distortion. The BMC value from this study showed 1.7 times as large as from previous method, however, the distribution of BMC from this study was similar to one from previous method.The results demonstrated that the measuring system was able to measure BMC in edentulous mandible and that this system may be useful for an accurate prognosis for implant treatment and for osteoporosis screening.

骨矿物质含量（BMC）的研究可用于骨质疏松症筛查和准确的植入治疗预后。 BMC通过特殊设备作为定量计算机断层扫描测量。在这项研究中，通过使用全景X射线系统来改善BMC测量系统，以获取一次牙齿拱门和相关结构的总体覆盖范围。我们调查了该系统的测量性能。我们将骨幻影应用于参考和测试Stepwedges，X500CR（Morita Co.ltd。）到全景X射线系统和DENOPTIX数字成像系统（Dentsply Co. Ltd.）以图像输入设备。暴露条件为60kV，10MA。参考Stepwedge固定在图像层的左侧，测试阶梯钢的位置被更改为以下1）层的内部或外部，2）在前磨牙或摩尔区域中。我们验证了该系统在每个条件下的测量准确性和可重复性。摩尔区域的测量值高于前磨牙区域。测量值的变化取决于测量位置。调整后的RMET值的准确性为1.25％（相对误差）。检测到介体和远端区域之间的放大倍数的差异。与下颌骨位置相对应的转换减少了失真。这项研究的BMC值显示出与以前的方法一样大的1.7倍，但是，这项研究中BMC的分布与先前方法的分布相似。结果表明，测量系统能够测量无牙本质下的BMC，并且该系统对于植入物治疗和骨质渗透性筛查的准确预后可能很有用。