发明申请
- 专利标题: RECONSTRUCTION METHOD FOR HELICAL CONE-BEAM CT
- 专利标题(中): 螺旋CT梁的重建方法
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申请号: US11913821申请日: 2006-05-03
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公开(公告)号: US20090268863A1公开(公告)日: 2009-10-29
- 发明人: Thomas Koehler , Claas Bontus , Peter Koken
- 申请人: Thomas Koehler , Claas Bontus , Peter Koken
- 申请人地址: NL Eindhoven
- 专利权人: KONINKLIJKE PHILIPS ELECTRONICS N. V.
- 当前专利权人: KONINKLIJKE PHILIPS ELECTRONICS N. V.
- 当前专利权人地址: NL Eindhoven
- 优先权: EP05104025.1 20050513
- 国际申请: PCT/IB06/51388 WO 20060503
- 主分类号: H05G1/60
- IPC分类号: H05G1/60 ; G06K9/00
摘要:
The invention relates to a method and a system for the reconstruction of an object function (f(x)) based on projections acquired during the motion of a radiation source on a helical trajectory (17). The method is particularly suited for an n-PI+ acquisition which by definition completely comprises an n-PI and additionally some overscan data from the (n+2)−PI window. According to the method, two sets (Σ≧m, Σ≧m) of filtered projections are generated from the measuring values and separately back-projected to yield two absorption functions. The first absorption function (flf(x)) is based on contributions of Radon-planes with at most m intersections with the source trajectory (17), while the second absorption function (fhf(x)) is based on Radon-planes with more than m intersections with the source trajectory (17). The two absorption functions are added to yield the final absorption function (f(x)) of an object in the examination zone. In an approximative version of the method, the sets (Σ≧m, Σ≧m) of filtered projections are first added and then back-projected.
公开/授权文献
- US07778387B2 Reconstruction method for helical cone-beam CT 公开/授权日:2010-08-17