Dento-maxillary three-dimensional image using cross-sectional tomography

本研究的目的是利用颌骨和/或牙弓的多层断层扫描建立三维(3D)重建图像。首先，为了得到适合于三维重建的横断面图像，我们研究了水平X射线束方向对下颌磨牙区横断面图像的影响程度。作为研究的结果，采用了以下技术来寻找最佳的X射线束方向并生成3D图像：1：作为一个方位，拍摄每个下颌区域的5张或5张以上的图像，并在水平X射线束方向上进行数字改变。2：以皮质骨的锐度和颌骨横切面的面积为标准选择X射线束方向。3：在校正后的X射线束方向上连续拍摄横切图像。4：扫描仪将图像数字化并重建为3D图像。该3D图像可能有助于骨内种植治疗。

The purpose of this study is to create the three-dimensional (3D) reconstructed image using multi-layr cross-sectional tomography of Jaw and/or tooth arch. Firstly, to obtain the cross-sectional image which is fit to 3D reconstruction, we investigated how much the horizontal x-ray beam direction affected the crosssectional image of the mandibular molar region. As a result of studies, following technique were used to find a best x-ray beam direction and to create the 3D image.1 : As a orientation, five or more images of each mandibular region are taken with digital changes in the horizontal x-ray beam direction.2 : A x-ray beam direction is chosen using the sharpness of cortical bone and the area of cross-cut jaw bone as the criteria.3 : Serial cross-cut images are taken in the corrected x-ray beam direction.4 : The images are digitized by a scanner and reconstructed to a 3D image.This 3D image may useful to the endosseous implant treatment.