13 March 2007 Multi-source inverse geometry CT: a new system concept for x-ray computed tomography
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Abstract
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.
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Bruno De Man, Bruno De Man, Samit Basu, Samit Basu, Dirk Bequé, Dirk Bequé, Bernhard Claus, Bernhard Claus, Peter Edic, Peter Edic, Maria Iatrou, Maria Iatrou, James LeBlanc, James LeBlanc, Bob Senzig, Bob Senzig, Richard Thompson, Richard Thompson, Mark Vermilyea, Mark Vermilyea, Colin Wilson, Colin Wilson, Zhye Yin, Zhye Yin, Norbert Pelc, Norbert Pelc, } "Multi-source inverse geometry CT: a new system concept for x-ray computed tomography", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65100H (13 March 2007); doi: 10.1117/12.712854; https://doi.org/10.1117/12.712854
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