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中文摘要：
提出了滤波反投影（filtered back projection,FBP）算法的基于被动式射线驱动和预插值的反投影策略。首先对滤波后的投影采用线性插值预插值到更加精细的间隔上,然后对每个角度下的滤波投影用被动式射线驱动法反投影,得到重建图像。反投影时为了减少求取投影地址时三角函数的运算,将三角函数值事先求得并存到查找表中,需要时调用。反投影时采用简单的最邻近插值法插值,以节省插值时间。仿真实验表明,这种方法可以有效提高反投影速度。
英文摘要：
A back projection method of the filtered back projecion algorithm is proposed based on passive ray-driven technique and pre-interpolation technique.Firstly,the filtered projections are interpolated to more dense points by linear interpolation.Then,every angle＇s projection is back projected using passive ray-driven technique and the reconstructed image is made.For decreasing the calculation amount of angle functions for obtaining projection address,the trigonometric functions＇ values are calculated in advance and stored into a table which can be indexed if needed.The simple neighbor interpolation method is used during backprojecion so as to reduce time for interpolation.The simulation experiments illustrate that the method effectively improve the back projection speed.
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