发明名称 |
Method and apparatus for correcting multipole aberrations of an electron beam in an EBT scanner |
摘要 |
A method and apparatus are disclosed for reducing variation in a spot size of an electron beam at a target due to multipole aberrations in an electron beam tomography (EBT) scanner. A magnitude of a DC voltage applied to a positive ion electrode (PIE) within the EBT scanner is adjusted and an orientation of a non-circular aperture of the PIE is aligned with respect to the electron beam. A profile of the spot size is monitored while adjusting the magnitude of the DC voltage and while aligning the orientation of the non-circular aperture of the PIE until the variation in the spot size is sufficiently reduced.
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申请公布号 |
US6670625(B1) |
申请公布日期 |
2003.12.30 |
申请号 |
US20020064174 |
申请日期 |
2002.06.18 |
申请人 |
GE MEDICAL SYSTEMS GLOBAL TECHNOLOGY COMPANY, LLC |
发明人 |
RAND ROY E.;GAREWAL KHEM |
分类号 |
G21K1/087;(IPC1-7):G01N23/00 |
主分类号 |
G21K1/087 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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