INCORPORATING A-PRIORI INFORMATION INTO THE SHEFFIELD FILTERED BACKPROJECTION ALGORITHM
INCORPORATING A-PRIORI INFORMATION INTO THE SHEFFIELD FILTERED BACKPROJECTION ALGORITHM
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DOI：
10.1088/0967-3334/16/3a/011
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发表时间：
1995-08-01
影响因子：
3.2
通讯作者：
BARBER, DC
中科院分区：
文献类型：
--
作者：
AVIS, NJ;BARBER, DC
谢菲尔德图像重建算法基于被成像的身体的初始电导率分布是均匀的假设。在许多情况下，这一假设是违反的。先前通过修改反投影矩阵来结合先验信息的尝试是无效的。包括先验信息的替代方法在最近重新制定谢菲尔德图像重建算法之后变得明显。将矩阵代数应用于图像重建方程揭示了先验信息的并入可以被认为是对原始反投影矩阵的修改或复合数据滤波器的组成部分。一个简单的二维模型的成人头部被选择来测试这种方法。使用来自该模型的合成数据的成像研究的结果表明，先验信息已成功地纳入图像重建过程。将先验信息包括到图像重建过程中的能力可能对Err的更具挑战性的应用（例如对成人头部进行成像）具有重要意义。
The Sheffield image reconstruction algorithm is based on the assumption that the initial conductivity distribution of the body being imaged is uniform. In many situations this assumption is violated. Previous attempts at incorporating a priori information by modifications to the backprojection matrices were ineffective. An alternative method of including a priori information became apparent following the recent reformulation of the Sheffield image reconstruction algorithm. Applying matrix algebra to the image reconstruction equations reveals that the incorporation of a priori information can be considered as either a modification to the original backprojection matrix or a component of a composite data filter. A simple two-dimensional model of the adult head was chosen to test this approach. The results of imaging studies using synthetic data derived from this model show that a priori information has been successfully incorporated into the image reconstruction process. The ability to include a priori information into the image reconstruction process may have significant implications for the more challenging applications of Err such as imaging the adult head.