摘要
目的工业CT的检测对象大小不一,在探测器尺寸一定的情况下,工程上往往通过设计不同的扫描方式以及所对应的重建算法来获得更大的成像范围,比如转台偏置、探测器偏置等扫描模式。本文提出一种用于转台一次偏置扫描模式下的重建算法。该算法首先用Parker类型函数对重复采样的投影数据进行加权,然后用扇束重建算法得到断层图像。实验结果证明了这种方法的有效性和优越性。
The samples to be detected by industrial CT have varying sizes.Different scanning models and corresponding reconstruction algorithms are designed to enlarge the field of view under the condition of a detector of fixed size,such as rotation off-centered,detector displaced.This paper proposes a reconstruction algorithm applied to rotation off-centered scanning.This method weights the redundant projection data sampled twice with a Parker type function first.Then standard fan beam reconstruction algorithm is applied to obtain slice images.Experimental results prove the validity and advantage of this method.
出处
《中国体视学与图像分析》
2011年第3期248-253,共6页
Chinese Journal of Stereology and Image Analysis
关键词
工业CT
转台偏置扫描
探测器偏置扫描
空间分辨率
扫描视野
industrial computed tomography
rotation off-centered scan
detector displaced scan
spatial resolution
field of view
