A new volumetric CT machine for dental imaging based on the cone-beam technique: preliminary results
A new volumetric CT machine for dental imaging based on the cone-beam technique: preliminary results
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DOI：
10.1007/s003300050586
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发表时间：
1998-01-01
影响因子：
5.9
通讯作者：
Andreis, IAB
中科院分区：
文献类型：
--
作者：
Mozzo, P;Procacci, C;Andreis, IAB
本文介绍一种新型的容积CT，它采用锥束技术代替传统的扇束技术。该机器专用于牙-上颌-面部种植，特别是种植领域的规划。从技术参数和软件性能等方面介绍了该装置的主要特点。获得的图像报告为体积重建的各种2D截面。此外，测量的几何精度和辐射剂量吸收的病人，获得使用特定的幻影。并将吸收剂量与螺旋CT辐射剂量进行了比较。参考各种重建模式和不同的空间方向进行评价，宽度测量的几何精度为0.8-1%，高度测量的几何精度为2.2%。扫描过程中吸收的辐射剂量在中心轴和外周轴上显示出不同的轮廓。关于中心轮廓的最大值，新装置的剂量约为传统螺旋CT的六分之一。新的系统似乎是非常有前途的牙颌面成像，由于良好的性能和低成本之间的比率，加上低辐射剂量，非常有趣的大规模使用的CT技术在这样的诊断应用。
The objective of this paper is to present a new type volumetric CT which uses the cone-beam technique instead of traditional fan-beam technique. The machine is dedicated to the dento-maxillo-facial imaginf, particularly for planning in the field of implantology. The main characteristics of the unit are presented with reference to the technique parameters as well as the software performance. Images obtained are reported as various 2D sections of a volume reconstruction. Also, measurements of the geometric accuracy and the radiation dose-absorbed by the patient; are obtained using specific phantoms. Absorbed dose is compared with that given off by spiral CT. Geometric accuracy, evaluated with reference to various reconstruction modalities and different spatial orientations, is 0.8-1% for width measurements and 2.2% for height measurements. Radiation dose absorbed during the scan shows different profiles in central and peripheral axes. As regards the maximum value of the central profile, dose from the new unit is approximately one sixth that traditional spiral CT. The new system appears to be very promising in dento-maxillo-facial imaging and, due to the good ratio between performance and low cost, together with low radiation dose, very intersting in view of large-scale use of the CT technique in such diagnostic applications.