| Project/Area Number |
24656570
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
KANNO Ikuo 京都大学, 工学(系)研究科(研究院), 教授 (50234167)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | X線コンピュータ断層撮影 / エネルギー分解 / 実効原子番号 / 線減弱係数 / X線 / コンピュータ断層撮影 / エネルギー分解CT / フィルタX線 / 物質識別 / 低被曝 |
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| Research Abstract |
To find cancers by X-ray computed tomography (CT), iodine contrast agent is injected into blood vessel. The iodine contrast agent, however, has side effect, such as a fatality among ten thousand patients. It is desirable to find cancers without using iodine contrast agent. To meet this demand, we performed effective atomic number measurements with energy-resolved CT. Normally, the measurement of effective atomic number is conducted with using two monochromatic X-rays. We employed white X-rays with defining two narrow energy ranges as quasi-monochromatic X-rays in the analysis. Employed phantom was a cylindrical acrylic 3 cm in diameter with 2 diameter aluminum rod in the center. We measured linear attenuation coefficients for X-rays in two narrow energy ranges and estimated the ratio of them. The obtained effective atomic numbers showed excellent agreement with the theoretical ones within 1% of errors.
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