Developmental Research for Digital Panoramic Machine Based on a New Mathematical Model

(1)建立了一种新的全景层析成像数学模型。基于新的数学模型，研制了一种新型全景层析成像机。这台机器有5个轴，机构是完全由电脑控制的。编制了自动对焦系统和自动图像层设置程序，便于操作。(2)通过计算机模拟，该机器拍摄的全景图像具有恒定的放大倍数，在焦平面上没有失真。(3)该机器可以同时进行多胶片层析成像。该机拍摄的断层图像质量与Polytome U专用断层摄影机的图像质量相当。(4)研制了一套数字化X线成像系统。该系统由EXICON面板(一种光电放大器)、CCD线传感器、A/D转换器和32位微处理器组成。(5)利用该成像系统实现了牙科全景成像。(6)设计了全景图像的图像存储与传输系统。图像存档系统由Macintosh II和磁光盘组成。从CPU到CPU的图像通信速率为1.7兆字节/秒，这一速度被认为足以满足临床应用。(7)该系统开发的数字图像与传统的胶片图像相比并不是很好。现在，我们正在开发另一种X射线传感器，以拍摄更好的数字全景图像。

(1)A new mathematical model for panoramic tomography was established. A new type of machine for panoramic tomography based on the new mathematical model was developed. This machine have 5 axles and the mechanism is a completely computer-controlled. Auto-focus system and auto image-layer setting program was made for easy operation.(2)According to the computer simulation, the panoramic images taken by this machine have a constant magnification and no distortion on the focal plane.(3)Simultaneous multi-film tomography could be made by this machine. Image quality of the tomograins taken by this machine was as good as those taken by a special machine for tomography(Polytome U).(4)A digital x-ray imaging system was devised. This system consisted of EXICON PANEL(A kind of photo amplifier), CCD line sensor, A/D converter and 32bit micro processor.(5)Using this imaging system, dental panoramic imaging was perfon-ned.(6)Picture archiving and communication system for panoramic images was devised. Picture archiving system consisted of Macintosh II and Magneto-optical disc. Picture communicating rate from cpu to cpu was 1.7 Mega byte/sec., and this speed was considered to be enough for clinical use.(7)The digital images developed by this system were not very good up to date compared with the conventional film images. Now we are developing another x-ray sensor to take better digital panoramic images.