摘要
为克服单光子发射计算机断层显像中 ,会出现假阳性的结果。利用胸部数学模型和投影算法得到发射和透射的投影数据 ,采用校正算法重建发射断层图像 ,再与模型数据相比较 ,从而确定各算法的收敛性和收敛速度 ,总结出选择合适的衰减校正算法 ,并提出了将多目标优化方法应用于衰减校正的设想。
A wrong diagnosis will occur in cardiac SPECT imaging if the attenuation and scattering of photons by body's soft tissues are not considered. To correct the attenuation, the simultaneous emission and transmission projections are obtained from the same SPECT system, and attenuation correction algorithms must be used in the emission image reconstruction. This paper compares the quality of various image reconstruction algorithms in SPECT, such as conventional filtered back projection, weighted back projection, iterative Chang's method, ML EM, OS EM, RAMLA, ML EM with Gibbs smoothing, Bayesian reconstruction, etc.. A mathematical phantom is used to test the varias algorithms. The results suggest some consideration to choose the most appropriate algorithm. A new algorithm, the Multi object Optimization Method is proposed to improve image reconstruction and attenuation correction.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第1期52-56,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金项目!(396 70 2 2 7)
