以下为句子列表：
英文: Since we defined the frustum, we know the angle at which the sides of the frustum meet - this is the field of view we used to create the projection matrix in the first place.
中文: 确定好锥截体，我们就知道锥截体顶角的大小—这是我们在第一个地方用来创建投影矩阵的视场。
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英文: The real-time obtainment of the components of projection matrix and the substitution of constant step for optimal step in the one-dimension search in conjugate gradient were adopted to ensure the equality of reconstructed image from incomplete projections
中文: 通过即时获取投影矩阵分量，以固定步长替代共轭梯度法中一维搜索最优迭代步长，在确保品质的同时缩短重建时间。
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