发明授权
US07970097B2 Method for producing tomographic images, control device, tomography unit and computer program product
有权
断层摄影图像的制作方法,控制装置,断层摄像机和计算机程序产品
- 专利标题: Method for producing tomographic images, control device, tomography unit and computer program product
- 专利标题(中): 断层摄影图像的制作方法,控制装置,断层摄像机和计算机程序产品
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申请号: US12458806申请日: 2009-07-23
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公开(公告)号: US07970097B2公开(公告)日: 2011-06-28
- 发明人: Herbert Bruder , Thomas Flohr , Rainer Raupach
- 申请人: Herbert Bruder , Thomas Flohr , Rainer Raupach
- 申请人地址: DE Munich
- 专利权人: Siemens Aktiengesellschaft
- 当前专利权人: Siemens Aktiengesellschaft
- 当前专利权人地址: DE Munich
- 代理机构: Harness, Dickey & Pierce, P.L.C.
- 优先权: DE102008034564 20080724
- 主分类号: A61B6/00
- IPC分类号: A61B6/00
摘要:
A method is disclosed for producing tomographic images relating to different movement phases of a periodically moving object with the use of a tomography unit that includes a recording system that is arranged rotatably about a z-axis of the tomography unit, the recording system including an X-ray tube to which a tube current can be applied and a detector (17, 18) for acquiring projections. In at least one embodiment, the recording system is initially positioned relative to the object at a first z-position, and projections are acquired from a multiplicity of different projection dimensions at this z-position, in a fashion triggered by a movement signal representing the movement of the object, projections relating to a first movement phase of the object being acquired in a prospectively defined first time window and projections relating to at least a second movement phase of the object being acquired in a prospectively defined second time window. In at least one embodiment, a modulation of the tube current is performed in such a way that different tube current values are set in the first and the second time window to attain a prescribable different signal-to-noise ratio in the produced images. The recording system is then positioned sequentially at further z-positions, and respectively corresponding projections are acquired there for the two movement phases until a prescribed examination area is scanned at the desired z-positions. Tomographic images are reconstructed in real time or subsequently on the basis of the obtained projections.