Limited view thermoacoustic tomography
Limited view thermoacoustic tomography
复制标题
有限视野热声断层扫描
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
L.V. Wang
中科院分区：
文献类型：
--
作者：
Yuan Xu;L.V. Wang
将截断共轭梯度法应用于热声层析成像中的有限视角问题，并与声信号一阶时间导数反投影法的计算结果进行了比较。我们的数值模拟表明，有一个稳定和完美的重建在2-D /spl π/-视图问题，其中的最小角度的检测曲线是/spl π/时，从成像区域的利益。相反，在视图小于/spl pi/的问题中，数据是不完整的，并且在重建图像中伪影和定量误差是明显的。指出截断共轭梯度法一次迭代后的结果与修正反投影法的结果是等价的，可以恢复被成像物体的高频信息。在接下来的10次迭代中，截断共轭梯度法的低频信息得到了明显的恢复。
Truncated conjugate gradient method was applied to study the limited view problem in thermoacoustic tomography, and the results were compared with those of modified backprojection method, which is the backprojection of the first order time derivative of acoustic signals. Our numerical simulations showed that there is complete data for a stable and perfect reconstruction in a 2-D /spl pi/-view problem, where the least angle acquired by the detection curve is /spl pi/ when viewed from the imaged region of interest. On the contrary, in a problem where the view is less than /spl pi/, data is incomplete, and artifacts and quantitative errors were obvious in the reconstructed images. It was pointed out that the result after one iteration in truncated conjugate gradient method is equivalent to that of modified backprojection, which can restore the high frequency information of imaged objects. The low frequency information can be recovered significantly in the next ten iterations of truncated conjugate gradient method.