扁平构件的CT重建方法研究

Reconstruction of the Industrial Piece with Large and Flat Size by CT

提出了一种主射线与旋转轴成 4 5°入射角、面阵探测器与旋转轴垂直的三维CT投影方法 .在X射线源能量较低的情况下 ,该方法能够对大而扁的工业构件实施三维CT重建 .文中推导了这种投影方式下三维CT反投影重建算法 ,并用计算机进行了仿真 .最后使用 2 70kV射线机对直径 1 0 0mm、厚度 1

This paper describes a projection method for three- dimensional CT in which the angle between the main X-ray beam and the rotation axis of object is 45°. Three-dimensional CT for the industrial piece with larg e and flat size can be carried out by means of this method using a low energy X -ray source. The back-projection algorithm reconstructing a 3D object for abov e projection method is derived in this paper. Eventually a steel piece with the diameter 100mm and thickness 13mm was reconstructed using the X-ray generator w ith 270kV.