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大面积非晶硅平板探测器(flat panel detector-FPD)在透射射线成像领域得到越来越多的应用。基于FPD的圆轨道FDK型三维计算机层析成像技术(Computed Tomography,3D-CT)检测速度快,但成像质量不及2D-CT。为发挥3D-CT速度优势,同时提高系统对物体感兴趣区域CT成像的性能,研究了一种基于FPD的、配合3D-CT功能的高像质2D-CT成像技术;提出了一种集噪声抑制、散射校正和高频细节增强于一体的2D-CT投影预处理方法,并完成了基于FPD的2D/3D-CT集成原型系统的研制。系统性能测试结果表明,基于FPD的2D-CT技术成像空间分辨率达3lp/mm,密度分辨率达5‰。
Large area flat panel detector (FPD) has been used more and more in the field of transmission radiography. FPD-based circular orbit FDK 3D computed tomography (Computed Tomography, 3D-CT) detection speed, but the imaging quality is less than 2D-CT. In order to give full play to the speed advantage of 3D-CT and to improve the performance of CT imaging in the region of interest of the object, a high-quality 2D-CT imaging technique based on FPD and 3D-CT is studied. Suppression, scattering correction and high frequency detail enhancement in one of the 2D-CT projection preprocessing method, and completed the FPD-based 2D / 3D-CT integrated prototype system development. The system performance test results show that 2D-CT based on FPD has 3lp / mm spatial resolution and 5 ‰ density resolution.