Fast reconstruction method based on C-arm tomosynthesis
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摘要: 传统的层析X射线摄影合成(Tomosynthesis)算法不适合对C型臂X射线投影进行切片重建.提出了一种改进的Tomosynthesis算法CTS (C-arm based Tomosynthesis),依据C型臂成像原理,将不同角度的X射线投影按其映射关系在三维空间内旋转-叠加来重建切片.该算法可以对等中心C型臂连续采集的一组有限角度X射线投影进行切片重建.通过计算机模拟空心球和空心圆柱模型的C型臂X射线投影,用该算法对其二维投影进行切片重建,并利用重建结果分析了CTS算法的重建精度以及抗噪声干扰能力.最后给出了将CTS算法推广到可以对非等中心C型臂进行切片重建的步骤. CTS为基于C型臂的术中三维成像提供了一种参考方法.
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关键词:
- tomosynthesis /
- X射线 /
- 重建
Abstract: As the traditional tomosynthesis is not appropriate for C-arm based slice reconstruction, a modified tomosynthesis method, CTS(C-arm based tomosynthesis), was proposed. CTS method rotates and overlays all the X-ray projections in 3-D space according to the mapping matrices of different angles, which can getfrom the geometry of the C-arm. This method can be used for the limited-angle cone-beam reconstruction, which is very suitable for isocentric C-arm imaging. The algorithm simulations with projections of a hollow sphere and two hollow-cylinder models show good image quality and demonstrate CTS has high precision. The reconstruction from projections with noise was also conducted. The results show that CTS is noise-insensitive, which validates the feasibility of the method for C-arm 3-D imaging. Finally, the process that makes CTS method adapt to the non-isocentric C-arm was proposed.-
Key words:
- tomosynthesis /
- X-ray /
- reconstruction
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[1] 温俊海,卜凡亮,程敬之. 有限角投影下的快速重建方法[J].西安交通大学学报,2000,34(4):33-36 Wen Junhai,Bu Fanliang,Cheng Jingzhi. Reconstruction method with limited angle .Journal of Xi′an Jiaotong University,2000,34(4):33-36(in Chinese) [2] Dobbins III J T,Godfrey D J. Digital x-ray tomosynthesis:current state of the art and clinical potential[J].Phys. Med. Biol.,2003,48(1):R65-R106 [3] Kolitsi A, Anastassopoulos V, Scodras A, et al. A multiple projection method for digital tomosynthesis[J].Medical Physics,1992,19:1045-1050 [4] Lou Hong, Zhang Qizhi, Gibon Glayton, et al. Digital tomosynthesis of joints based on a C-arm system[J].Journal of X-Ray Science and Technology,2005,13:1-8 [5] Fahrig R, Moreau M, Holdsworth D W. Three-dimensional computed tomographic reconstruction using a C-arm mounted XRII:correction of image intensifier distortion[J]. Medical Physics,1997,24(7):1097-1106 [6] Brack C,Burghart R,Czpof A, et al. Accurate X-ray navigation in computer-assisted surgery Lemke H. Proceedings of the 12th International Symposium on Computer Assisted Radiology and Surgery (CAR′98). New York:Elsevier,1998:716-720 [7] Koppe R, Klotz E, de Beek JO. Digital tomosynthesis on a rotating C-arm system Bick U, Seibel R M M. Computer Assisted Radiology 15th International Congress and Exhibition.Berlin:CARS,2001:1142-1143 -
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