论文标题
通过使用虚拟比对方法纠正运动误差，在牙科处理中使用平行梁CT的可能性
Possibility of using Parallel beam CT in dental treatment by correction of movement errors with virtual Alignment Method
论文作者
论文摘要
这项研究的目的是纠正由于CT扫描过程中患者的运动，因此要获得更精确的CT图像，可能会发生的运动误差，此外，还研究了可能在牙科处理中使用平行束CT的使用。用PBCT扫描提取的人牙，并有意分配患者在CT扫描期间可能引起的运动误差。误差的最大宽度被设计为达到0.1毫米。固定点的轨迹在包括固定点的正弦图中追踪。使用虚拟比对法修改了从正弦曲线偏离的部分。当给出运动误差时，重建图像的质量显着降低。牙齿内部的放射性部分用作固定点。通过将固定点转移到正式中心来纠正误差，而固定点的重置不会引起任何图像的变形或大小的变化。运动误差用牙齿内部的固定点校正。通过这种方法获得的更精确的CT图像预计将在使用CAD/CAM的牙科处理领域广泛应用。
The purpose of this study is to correct the movement errors that may occur because of the patients' movement during the CT scanning and thus, to obtain more precise CT images, additionally to investigate the possible use of Parallel Beam CT in the dental treatment. An extracted human tooth was scanned with PBCT and the possible movement errors that patients may cause during the CT scan were intentionally assigned. The maximum width of errors was designed to reach 0.1 mm. The trajectory of the fixed point was traced in the sinogram that includes the fixed point. The part deviated from the sinusoidal curve was modified using the Virtual Alignment Method. The quality of reconstructed image was remarkably degraded when the movement errors were given. A radiopaque part inside the tooth was used as a fixed point. The errors were corrected by shifting the fixed point to the center of sinogram and this relocation of fixed point did not cause any distortion of image or change of size. The movement errors were corrected with the fixed point inside the tooth. The more precise CT images obtained through this method are expected to be of extensive application in the area of dental treatment using CAD/CAM.
