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7 September 2006 Experimental evaluation of low-resolution CT regulated tomosynthesis using a flat-panel detector
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Tomosynthesis is a technique for reconstructing a 3D object from projection data collected within a limited-angular scanning range. In this paper, we describe and evaluate a methodology for reconstructing a region of interest (ROI) by combining a global low-resolution CT scan and a local high-resolution tomosynthetic scan. First, a low-resolution CT scan is acquired. Then, a high-resolution tomosynthetic scan is performed with respect to the ROI. Finally, the ROI is reconstructed from these two datasets. Our tomosynthetic algorithm is evaluated on a state-of-the-art flat-panel detector based CT system using a standard CT performance phantom. The experimental results demonstrate that our modality fusion approach effectively eliminates the interference from surrounding structures and minimizes the shading problem, as compared to the tomosynthetic results obtained without utilizing the low-resolution CT scan. In conclusion, our approach provides better ROI reconstruction than tomosynthesis, and uses lower dose than CT. Hence, it may be used for temporal bone imaging, etc.
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Kai Zeng, Hengyong Yu, Michael Grasruck, Bernhard Schmidt, and Ge Wang "Experimental evaluation of low-resolution CT regulated tomosynthesis using a flat-panel detector", Proc. SPIE 6318, Developments in X-Ray Tomography V, 63181X (7 September 2006);

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