Multi-source inverse geometry CT: a new system concept for x-ray computed tomography
Multi-source inverse geometry CT: a new system concept for x-ray computed tomography
复制标题
多源逆几何CT：X射线计算机断层扫描的新系统概念
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
N. Pelc
中科院分区：
文献类型：
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作者：
B. De Man;S. Basu;D. Beque;B. Claus;P. Edic;M. Iatrou;J. Leblanc;B. Senzig;Richard A. Thompson;M. Vermilyea;C. Wilson;Z. Yin;N. Pelc
Third-generation CT architectures are approaching fundamental limits. Spatial resolution is limited by the focal spot size and the detector cell size. Temporal resolution is limited by mechanical constraints on gantry rotation speed, and alternative geometries such as electron-beam CT and two-tube-two-detector CT come with severe tradeoffs in terms of image quality, dose-efficiency and complexity. Image noise is fundamentally linked to patient dose, and dose-efficiency is limited by finite detector efficiency and by limited spatio-temporal control over the X-ray flux. Finally, volumetric coverage is limited by detector size, scattered radiation, conebeam artifacts, Heel effect, and helical over-scan. We propose a new concept, multi-source inverse geometry CT, which allows CT to break through several of the above limitations. The proposed architecture has several advantages compared to third-generation CT: the detector is small and can have a high detection efficiency, the optical spot size is more consistent throughout the field-of-view, scatter is minimized even when eliminating the anti-scatter grid, the X-ray flux from each source can be modulated independently to achieve an optimal noise-dose tradeoff, and the geometry offers unlimited coverage without cone-beam artifacts. In this work we demonstrate the advantages of multi-source inverse geometry CT using computer simulations.
