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基于球投影的面阵探测器扭转角测量与校正
Authors
孟凡勇
杨民
高海东
魏东波
Publication date
1 January 2012
Publisher
Abstract
为了消除基于面阵探测器的锥束X射线计算机断层成像(XCT,X-ray Computed Tomography)检测系统中探测器的安装误差对重建断层图像的影响,使投影坐标系准确建立,并与重建坐标系精确配准,提出了基于椭圆拟合的平板探测器位姿参数的估计方法.并在此基础上,从锥束XCT的近似重建算法FDK(Feldkamp)出发,结合空间坐标变换原理,改进了重建算法中投影地址的计算方式,使之能在存在安装误差的情况下准确计算投影地址,重建出正确的断层图像.该方法简单有效,计算量小,无需对系统硬件进行调整.实验结果表明,利用该方法可以有效地消除由于探测器位姿引起的图像伪影
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Last time updated on 05/12/2019
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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oai:ir.ipe.ac.cn:122111/9872
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Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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oai:ir.ipe.ac.cn:122111/44198
Last time updated on 11/04/2021