以下为句子列表：
英文: In the image reconstruction based on optimization without constraint, the variable metric method, the steepest descent method, and conjugate gradient method were applied to image reconstruction to improve iterative efficiency and reconstructed quality, an
中文: 摘要在无约束最优化为基础的图像重建问题中，为了提高迭代效率以及重建图像质量，首次提出将变度量法应用到图像重建中。
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