发明申请
- 专利标题: COMPUTED TOMOGRAPHY METHOD
- 专利标题(中): 计算机测图法
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申请号: US11575662申请日: 2005-09-23
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公开(公告)号: US20090185655A1公开(公告)日: 2009-07-23
- 发明人: Peter Koken , Andy Ziegler , Michael Grass , Thomas Köhler , Roland Proksa
- 申请人: Peter Koken , Andy Ziegler , Michael Grass , Thomas Köhler , Roland Proksa
- 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: EP04104892.7 20041006
- 国际申请: PCT/IB05/53154 WO 20050923
- 主分类号: A61B6/00
- IPC分类号: A61B6/00 ; G21K1/00
摘要:
A computed tomography method and apparatus are provided wherein a radiation source moves circularly relative to an examination zone about an axis of rotation (14). The radiation source produces a cone beam of x-rays and the focal point of this cone beam is switched between at least two positions (23a, 23b) spaced apart from each other and arranged on a line parallel to the axis of rotation to enlarge the reconstructable examination zone parallel to the axis of rotation. Preferably, the image of the examination zone is reconstructed using an iterative reconstruction method, in particular an algebraic reconstruction method or a maximum likelihood method.