| 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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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 医用画像工学 / X線CT / 画像雑音 / 被曝線量 / 画像再構成 / 逆投影 / フィルタリング / 折返し / 画素 |
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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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