A NEW CT SCANER USING IMAGING-PLATE FOR 2D DETECTOR

我们报道了一种新型的CT扫描仪的实验系统，该系统使用了一台用于二维X光探测器的成像机(IP)并重建了图像。本研究的目的是为将来的临床应用开发一台原型设备。这些运动由四步进电机和一台计算机驱动和控制。开发了基于以太网的数据传输系统和图像重建系统，利用IP技术，每4度台阶只采集到67个下颌骨投影数据。为了从这些不完整的投影数据直接重建三维图像，还发展了三维最大似然(EM)方法，在一次扫描过程中可以重建出连续的20个下颌骨横断面图像。该图像由200(X)×200(Y)×20(Z)像素(1像素=1 mm×1 mm×1 mm)组成。这一结果表明，新的CT机可以使用沿下颌骨的IP和不完全投影数据对颌骨区进行扫描。

We had reported on the experimental system of a new CTscanner using an Imaging-Prale (IP) for a 2-D Xray detector and reconstructed imagesThe purpose of this study was to develop a prototype equipment for the furture clinical use.A panoramic radiography system was reformed. The movements were driven and controlled by 4-stepping-motors and a computer. Ethernet-based data-transfer-systems and image reconstruction system were also developped.By using IP, 67projection data were acquired only along the mandibular bone at every 4 degree step. In order to reconstruct the 3-dimentional images directiy from these incomplete projection data, the 3-dimentional-Maximum-Likelihood (EM) -method was also developped.Sequential 20transverse image of a mandibular bone could be reconstructed in one scanning procedure. This image was made up of 200 (X) x200 (Y) x20 (Z) pixels (1pixse=1mmx1mmx1mm) .These results suggested the possibility of the new CTscanner by using an IP ad incomplete projection data along the mandibular bone for the region of jaw bones.