Cine cone beam CT reconstruction using low-rank matrix factorization: algorithm and a proof-of-principle study.
Cine cone beam CT reconstruction using low-rank matrix factorization: algorithm and a proof-of-principle study.
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DOI：
10.1109/tmi.2014.2319055
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发表时间：
2014-08
影响因子：
10.6
通讯作者：
Zhao H
中科院分区：
文献类型：
--
作者：
Cai JF;Jia X;Gao H;Jiang SB;Shen Z;Zhao H
呼吸相关CBCT，通常称为4DCBCT，提供呼吸相分辨率的CBCT图像。典型的4DCBCT表示患者在一个呼吸周期内的平均图像，而第四维实际上是呼吸时相而不是时间。在许多临床应用中，希望获得真正的4DCBCT，其第四维是时间，即每个组成的CBCT图像对应于一个瞬时投影。从理论上讲，从单个投影重建CBCT图像是不可能的。然而，如果4DCBCT扫描的所有组成CBCT图像共享大量冗余信息，则有可能通过研究其稀疏性和相干/冗余来很好地重建这些图像。虽然这些CBCT图像不是完全时间分辨的，但它们可以自动利用患者解剖结构的局部和全局时间相关性，并包含比传统4DCBCT更多的患者几何形状的时间变化信息。在这项工作中，我们提出了一种半时间分辨CBCT的计算模型和算法，称为Cine-CBCT，它基于低阶近似，可以利用这些Cine-CBCT图像中潜在的局部和全局时间相关性，如慢变化、周期性或重复性。
Respiration-correlated CBCT, commonly called 4DCBCT, provides respiratory phase-resolved CBCT images. A typical 4DCBCT represents averaged patient images over one breathing cycle and the fourth dimension is actually breathing phase instead of time. In many clinical applications, it is desirable to obtain true 4DCBCT with the fourth dimension being time, i.e., each constituent CBCT image corresponds to an instantaneous projection. Theoretically it is impossible to reconstruct a CBCT image from a single projection. However, if all the constituent CBCT images of a 4DCBCT scan share a lot of redundant information, it might be possible to make a good reconstruction of these images by exploring their sparsity and coherence/redundancy. Though these CBCT images are not completely time resolved, they can exploit both local and global temporal coherence of the patient anatomy automatically and contain much more temporal variation information of the patient geometry than the conventional 4DCBCT. We propose in this work a computational model and algorithms for the reconstruction of this type of semi-time-resolved CBCT, called cine-CBCT, based on low rank approximation that can utilize the underlying temporal coherence both locally and globally, such as slow variation, periodicity or repetition, in those cine-CBCT images.