Image reconstruction from limited angle Compton camera data
Image reconstruction from limited angle Compton camera data
复制标题
根据有限角度康普顿相机数据重建图像
DOI：
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发表时间：
2002
影响因子：
3.5
通讯作者：
M. Hirasawa
中科院分区：
文献类型：
--
作者：
T. Tomitani;M. Hirasawa
康普顿照相机可用于天体物理γ射线望远镜中γ射线方向分布的成像，也可用于核医学中放射性同位素分布的成像，而不需要准直器。γ射线在锥体上的积分是用照相机测量的，因此需要某种反演方法。Parra发现了一种基于投影数据球谐展开的解析反演算法。他的算法适用于全部投影数据集。在本文中，六种可能的重建算法，允许从投影与散射角的有限范围内的图像重建进行了研究。四个算法存在不稳定性问题，另外两个算法是实用的。然而，重建图像的方差在这两种情况下发散，从而引入窗函数，其中方差以空间分辨率为代价而变得有限。这两种算法的方差进行了比较。基于和反投影反演的算法优于基于和投影反演的算法，具有上级的优点。
The Compton camera is used for imaging the distributions of γ ray direction in a γ ray telescope for astrophysics and for imaging radioisotope distributions in nuclear medicine without the need for collimators. The integration of γ rays on a cone is measured with the camera, so that some sort of inversion method is needed. Parra found an analytical inversion algorithm based on spherical harmonics expansion of projection data. His algorithm is applicable to the full set of projection data. In this paper, six possible reconstruction algorithms that allow image reconstruction from projections with a finite range of scattering angles are investigated. Four algorithms have instability problems and two others are practical. However, the variance of the reconstructed image diverges in these two cases, so that window functions are introduced with which the variance becomes finite at a cost of spatial resolution. These two algorithms are compared in terms of variance. The algorithm based on the inversion of the summed back-projection is superior to the algorithm based on the inversion of the summed projection.
影响因子：
3.8
作者：
M. Singh
通讯作者：
M. Singh
用于单光子发射计算机断层扫描的电子准直伽马相机。
影响因子：
3.8
作者：
Singh,M;Doria,D
通讯作者：
Doria,D