基于模型融合的有限角度CT迭代重建方法  

Model-guided Iterative Reconstruction for Limited-angle CT Image

作　　者：洪伟[1] 储颖[1,2] 牟轩沁[1] 

机构地区：[1]西安交通大学电信学院信通系图像所,西安710049 [2]深圳大学计算机与软件学院,广州深圳518060

出　　处：《CT理论与应用研究（中英文）》2012年第4期597-604,共8页Computerized Tomography Theory and Applications

基　　金：国家自然科学基金资助项目(61172163);教育部博士点基金项目(20110201110011);深圳市嵌入式系统设计重点实验室开放基金项目;广东高校优秀青年创新人才培养计划项目(LYM10118);深圳市科技研发资金基础研究计划(JC201105160492A)

摘　　要：针对有限角度扫描的CT重建,提出一种基于模型融合的CT迭代重建方法。模型来源于患者的早期Dicom图像。对扫描角度有限的投影数据,用统计迭代算法进行初步重建,得到预重建图像;将预重建图像与模型进行融合,得到融合图像;然后再次投影,补全原始投影缺失的部分,根据补全的投影数据重建出中间结果,之后重复投影、融合、重建过程直到满足终止条件。仿真实验表明,该算法能完整重建整个目标,在有效保留原目标特征的同时提高了小角度投影数据重建的质量。Aiming at the problem of limited-angle projection CT reconstruction, a model-guided iterative reconstruction for limit-angle CT image is proposed in this paper. An initial reconstructed image is firstly gained by statistical iterative algorithm from limited-angle data. The initial reconstructed image is fused with a prior-model image to acquire a fusion image. The fusion image is projected again to acquire the complementary projections, on which are the intermediate results of the reconstruction. This projection, fusion and reconstruction processes repeat until the final satisfactory image reconstructed. Simulation results have shown that the object can be reconstructed integrally by the proposed method and the quality of the final reconstructed images increase significantly, with all characteristics of the object preserved.

关 键 词：迭代重建 有限角度扫描 模型融合 CT 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]