发明授权
US07583778B2 X-ray CT apparatus and X-ray CT backprojection operating method
有权
X射线CT装置和X射线CT反投影操作方法
- 专利标题: X-ray CT apparatus and X-ray CT backprojection operating method
- 专利标题(中): X射线CT装置和X射线CT反投影操作方法
-
申请号: US10895858申请日: 2004-07-22
-
公开(公告)号: US07583778B2公开(公告)日: 2009-09-01
- 发明人: Issei Mori
- 申请人: Issei Mori
- 申请人地址: JP Tokyo JP Otawara-Shi
- 专利权人: Kabushiki Kaisha Toshiba,Toshiba Medical Systems Corporation
- 当前专利权人: Kabushiki Kaisha Toshiba,Toshiba Medical Systems Corporation
- 当前专利权人地址: JP Tokyo JP Otawara-Shi
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- 优先权: JPP2003-201332 20030724
- 主分类号: A61B6/03
- IPC分类号: A61B6/03
摘要:
An X-ray CT apparatus is provided which can be suppressed or eliminated of aliasing occurrence in the R-R scheme. The X-ray CT apparatus has a reconstructing device for processing the collected data on each view to thereby obtain projection data and making a backprojection operation on the projection data to thereby reconstruct an image. In the reconstructing device, when the X-ray detector element closest to a rotation center of the detector system determines that an X-ray path for detecting the X-ray irradiated is in a position deviated by a sampling offset (first value) from the rotation center, projection data of the X-ray detector element at least in a vicinity of the rotation center upon the backprojection operation is backprojected to a position deviated by a backprojection offset (second value: different from the first value) from the rotation center. Namely, in the case projection data has a deviation from a desired alignment state, backprojection is made to a suitably offset position correspondingly to the misalignment state without backprojection as per the projection path, thus achieving aliasing suppression and resolving power maintenance.