【摘要】 对反投影的计算方法进行了改进,设计了一种能够提高反投影速度的方法。使用这种方法,对模型数据进行了重建,结果表明,这种方法对图像质量的影响很小。由于实际PET的投影数据中的噪声相对较大,并且,在滤波反投影算法中的重建滤波器对重建图像的高频噪声有某种放大作用,针对这个问题,利用临床PET数据,从投影数据预处理、利用窗函数控制噪声两个方面进行了研究。更多还原

【Abstract】 Based on the numerical analysis for filtered backprojection algorithm,introduces a method to improve the computational procedures involved in the backprojection.A new computational method based on a ring grid that used the axial symmetry of the detector ring is developed.The proposed methods can accelerate the computation of backprojection and is very practical and easy to implement.This algorithm is used for the reconstruction of PET image and the results show that the new method works well.更多还原