Langlais Robert, Katsumata Akitoshi, Naidoo Sudeshni, Ogawa Koichi, Fukui Tatsumasa, Shimoda Shinji, Kobayashi Kaoru
Professor Emeritus, University of Texas Health Science Center Dental School and CEO Emeritus Enterprises, San Antonio, TX, USA.
Professor and Chair, Department of Oral Radiology, Asahi University School of Dentistry, Gifu, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2015 Nov;120(5):636-43. doi: 10.1016/j.oooo.2015.07.002. Epub 2015 Jul 13.
To investigate whether bone mineral density can be evaluated more accurately using a panoramic device with a new cadmium telluride photon-counting sensor and software than 2 panoramic devices with a conventional semiconductor sensor.
A fiduciary test object with several known levels of hydroxy apatite mineral concentration was placed in a phantom on the mandibular occlusal plane. Panoramic images were acquired by changing the position of the test object within the dental arch. The gray value, the spectrum deformation index (SDI), and the relative attenuation index (RAI) of the test object were evaluated. The SDI and RAI represent unique energy information as acquired by the QR-Master panoramic machine and the corresponding special QR-MC analysis software. In order to compare the values expressed in the different units (gray, SDI, and RAI values), the percentage discrepancy was calculated.
The cadmium telluride photon-counting fitted machine more consistently separated each of the hydroxy apatite concentrations in all of the different positioning configurations and locations. The SDI function of the QR Master machine produced more stable values than the RAI value and the gray values of the 2 conventional panoramic machines.
The methodologies as developed for this study can be used to test more sophisticated analyses for the determination of bone density.
研究使用配备新型碲化镉光子计数传感器和软件的全景设备评估骨密度是否比两台配备传统半导体传感器的全景设备更准确。
将具有几种已知羟基磷灰石矿物质浓度水平的基准测试对象放置在下颌咬合平面的体模中。通过改变测试对象在牙弓内的位置获取全景图像。评估测试对象的灰度值、光谱变形指数（SDI）和相对衰减指数（RAI）。SDI和RAI代表由QR-Master全景机和相应的特殊QR-MC分析软件获取的独特能量信息。为了比较以不同单位表示的值（灰度、SDI和RAI值），计算百分比差异。
碲化镉光子计数拟合机器在所有不同的定位配置和位置中更一致地分离出每种羟基磷灰石浓度。QR Master机器的SDI功能产生的值比两台传统全景机的RAI值和灰度值更稳定。
本研究开发的方法可用于测试更复杂的骨密度测定分析。
