Entropy-based method to evaluate the data integrity
Entropy-based method to evaluate the data integrity
复制标题
DOI：
10.1016/j.nima.2006.08.076
复制
发表时间：
2006-12
影响因子：
1.4
通讯作者：
Xu Peng;Ma Tianyu;Jin Yongjie
中科院分区：
文献类型：
--
作者：
Xu Peng;Ma Tianyu;Jin Yongjie
讨论了单光子发射计算机断层成像(SPECT)的投影阶段，分析了信息传输的特点，并对数据完整性进行了评估。在光子发射过程中，信息从源传输到探测器。在投影阶段，可以通过信息熵来评价投影数据的完整性，信息熵是表示源对象在投影数据条件下的平均不确定性的条件熵。模拟研究了针孔准直器发射计算机层析成像的投影数据。治疗了几种类型的准直器。结果表明，条件熵反映了数据的完整性，并指示了算法如何与几何匹配或不匹配。为了帮助决策者提高图像重建的质量，设计了一种新的数据完整性评估方法。
Projection stage of single photon emission computed tomography (SPECT) was discussed to analyze the characteristics of information transmission and evaluate the data integrity. Information is transferred from the source to the detector in the photon emitting process. In the projection stage, integrity of projection data can be assessed by the information entropy, which is the conditional entropy standing for the average uncertainty of the source object under the condition of projection data. Simulations were performed to study projection data of emission-computed tomography with a pinhole collimator. Several types of collimators were treated. Results demonstrate that the conditional entropy shows the data integrity, and indicate how the algorithms are matched or mismatched to the geometry. A new method for assessing data integrity is devised for those decision makers to help improve the quality of image reconstruction.