| Project/Area Number |
15K06097
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Measurement engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
宮本 直樹 北海道大学, 大学病院, 助教 (00552879)
西山 修輔 北海道大学, 工学研究院, 助教 (30333628)
梅垣 菊男 北海道大学, 工学研究院, 教授 (40643193)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | コンピュータトモグラフィー / 不完全投影データ / 時間的変動 / 重みつき再構成アルゴリズム / 低被ばく / 投影角限定 / 信頼性 / 時間変動 |
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| Outline of Final Research Achievements |
In order to monitor positions and shapes of tissue inside body during radiotherapy, we propose a computed tomographic reconstruction technique with limited projection beams. In this technique, the number of angles of projection beams measured at the time of reconstruction is small and most projection beams are lacked. The lacked projection data are replaced by the projection data measured in the past. Since the past state of body is different from that at the reconstructing time, the contribution of each projection data to the reconstructed image should be modified. By applying the weighted reconstruction algorithm to take into account the contribution of the projection data which includes past projection data, we demonstrated feasibility of low exposure monitoring.
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