Toward real-time charged-particle image reconstruction using polar onion-peeling
Toward real-time charged-particle image reconstruction using polar onion-peeling
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DOI：
10.1063/1.3126527
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发表时间：
2009-05-01
影响因子：
1.6
通讯作者：
Verlet, J. R. R.
中科院分区：
文献类型：
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作者：
Roberts, G. M.;Nixon, J. L.;Verlet, J. R. R.
对于膨胀的牛顿球围绕平行于探测平面的轴具有圆柱对称性的过程，提出了一种从其在探测平面上的二维（2D）投影重建完整三维光碎片分布的方法。该方法基于：（1）极坐标下的剥洋葱法[赵，《科学仪器评论》73，3044（2002）]，其中在逐渐减小的半径的极坐标中，减去平分牛顿球的平面外的事件对2D投影的贡献；（2）从极坐标下的基组展开（pBASEX）方法[加西亚，《科学仪器评论》75，4989（2004）]借鉴的思想，我们用它在每个增量半径处生成用于减法的2D投影。我们的方法在准确性方面与pBASEX方法一样好，没有采用笛卡尔坐标的重建方法常见的中心线噪声；并且它计算成本低，允许在典型的成像实验中在获取图像的同时进行重建。
A method to reconstruct full three-dimensional photofragment distributions from their two-dimensional (2D) projection onto a detection plane is presented, for processes in which the expanding Newton sphere has cylindrical symmetry around an axis parallel to the projection plane. The method is based on: (1) onion-peeling in polar coordinates [Zhao , Rev. Sci. Instrum. 73, 3044 (2002)] in which the contribution to the 2D projection from events outside the plane bisecting the Newton sphere are subtracted in polar coordinates at incrementally decreasing radii; and (2) ideas borrowed from the basis set expansion (pBASEX) method in polar coordinates [Garcia , Rev. Sci. Instrum. 75, 4989 (2004)], which we use to generate 2D projections at each incremental radius for the subtraction. Our method is as good as the pBASEX method in terms of accuracy, is devoid of centerline noise common to reconstruction methods employing Cartesian coordinates; and it is computationally cheap allowing images to be reconstructed as they are being acquired in a typical imaging experiment.