Limited-Range Few-View CT: Using Historical Images for ROI Reconstruction in Solitary Lung Nodules Follow-up Examination

Limited-Range Few-View CT: Using Historical Images for ROI Reconstruction in Solitary Lung Nodules Follow-up Examination
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有限范围少视图 CT:在孤立性肺结节随访检查中使用历史图像进行 ROI 重建

DOI:
10.1109/tmi.2017.2766101
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发表时间:
2017-12
影响因子:
10.6
通讯作者:
Jun Zhao
Jun Zhao
中科院分区:
工程技术1区
文献类型:
--
作者:
Weikang Zhang;Ying Song;Yi Chen;Jingchen Ma;Jianqi Sun;Jun Zhao

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众所周知,重复 CT 扫描会增加患癌症的风险;因此,使用多次后续CT扫描来监测肺结节的发展并进行结节的早期治疗是矛盾的。对于孤立性肺结节,区域扫描和感兴趣区域 (ROI) 重建可能会恢复结节的内部区域。本文提出了一种有限范围的少视图 CT,用于肺结节随访,并极大地减少 X 辐射。对于有孤立肺结节定位的 ROI 的计划扫描,可以采用有限范围的少视图 CT,因此每个视图中暴露于 X 射线的组织较少。还提出了一种充分利用以前标准肺部扫描的ROI重建方法。实验结果表明,结节的大小和形状得以保留。在 40 毫米 ROI 的情况下,圆形扫描的暴露 X 射线数量可减少 99.6%,3D 扫描可减少 99.9%。
Repeated CT scans are known to increase the risk of cancer; thus, it is paradoxical to use multiple follow-up CT scans to monitor the development of a lung nodule and conduct early treatment of the nodule. In the case of a solitary lung nodule, regional scanning and region of interest (ROI) reconstruction are likely to restore the internal area at the nodule. A limited-range few-view CT is proposed in this paper for lung nodule follow-ups with extremely reduced X-radiation. For a planned scanning of an ROI, where a solitary lung nodule is positioned, a limited-range few-view CT can be employed, and thus, less tissue is exposed to X-radiation per view. An ROI reconstruction method is also proposed that makes full use of the former standard lung scan. The experimental results show that the nodule size and shape are preserved. In the case of a 40-mm ROI, the number of exposed X-rays can be reduced by 99.6% for a circular scan and 99.9% for a 3-D scan.
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