2011 Fiscal Year Final Research Report
A reconstruction method to minimize image noise of X-ray CT
| Project/Area Number |
21591591
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Radiation science
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| Research Institution | Tohoku University |
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Principal Investigator |
MORI Issei 東北大学, 大学院・医学系研究科, 教授 (90375171)
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| Co-Investigator(Kenkyū-buntansha) |
MACHIDA Yoshio 東北大学, 大学院・医学系研究科, 教授 (30507083)
ISHIBASHI Tadashi 東北大学, 大学院・医学系研究科, 教授 (40151401)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 医用画像工学 |
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| Research Abstract |
In ordinary CT image reconstruction methods, there exists noise-aliasing problem when field of view, or pixel size, is not small enough. That is, noise component beyond pixel Nyquist frequency in the raw-data folds back within pixel Nyquist frequency. By incorporating a band-limiting process, we can eliminate this aliased noise without penalty on image sharpness. We have confirmed significant image quality improvement or reduction of radiation dose can be achieved by this technique especially when the image reconstruction kernel is high-frequency enhancing type.
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