A comparison of rotation- and blob-based system models for 3D SPECT with depth-dependent detector response.
A comparison of rotation- and blob-based system models for 3D SPECT with depth-dependent detector response.
复制标题
具有深度相关探测器响应的 3D SPECT 的基于旋转和基于斑点的系统模型的比较。
DOI：
10.1088/0031-9155/49/11/003
复制
发表时间：
2004
影响因子：
3.5
通讯作者：
Fessler,JA
中科院分区：
文献类型：
--
作者：
Yendiki,A;Fessler,JA
我们比较了两种不同的实现的3D SPECT系统模型的迭代重建，这两种补偿非均匀的光子衰减和深度依赖的系统响应。一种实现方式执行使用矩形体素的基础表示的图像的快速旋转，而另一种实现方式使用旋转对称体积元素的基础表示图像。在我们的模拟中，发现基于斑点的方法在重建图像的偏差-方差权衡方面略优于基于旋转的方法。然而，就计算负荷而言，它们的差异可能是显著的。对于许多典型的SPECT重建问题，基于旋转的方法更快，但是基于斑点的方法可以更好地适合于重建算法需要一次处理一个体积元素的情况。
We compare two different implementations of a 3D SPECT system model for iterative reconstruction, both of which compensate for non-uniform photon attenuation and depth-dependent system response. One implementation performs fast rotation of images represented using a basis of rectangular voxels, whereas the other represents images using a basis of rotationally symmetric volume elements. In our simulations the blob-based approach was found to slightly outperform the rotation-based one in terms of the bias-variance trade-off in the reconstructed images. Their difference can be significant, however, in terms of computational load. The rotation-based method is faster for many typical SPECT reconstruction problems, but the blob-based one can be better-suited to cases where the reconstruction algorithm needs to process one volume element at a time.