Development of image quality measurement methods for nonlinear CT images, and elucidation of iterative reconstruction methods and their realities.
Project/Area Number |
24601003
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
医学物理学・放射線技術学
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Research Institution | Tohoku University |
Principal Investigator |
MORI Issei 東北大学, 医学(系)研究科(研究院), 大学院非常勤講師 (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)
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Project Period (FY) |
2012-04-01 – 2015-03-31
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Project Status |
Completed (Fiscal Year 2014)
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Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥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 / エックス線・CT / 画質 / 画像再構成 |
Outline of Final Research Achievements |
The most important agenda of X-ray CT is its radiation dose. All CT manufactures are concentrating their effort to develop and refine iterative reconstruction methods (IR type reconstruction). By use of IR, it is claimed to achieve lower noise (i.e. lower dose) while maintaining high resolution. Many reports which are supportive to this view are incessantly published. However, images by IR type method behave non-linearly. Ordinary image quality indexes presuppose linearity of image. Applying them to nonlinear images without extreme care will fall into serious errors. We developed proper measurement methods so that ordinary image quality indexes can be applicable to nonlinear images. Using our methods, we shed light on pitfalls of image quality measurement for nonlinear images. We have confirmed that there is no net gain of image quality at least for some type of IR method. Through our many lectures, our view is now shared to some extend by researchers in this field.
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Report
(4 results)
Research Products
(19 results)
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[Presentation] CTの画質の限界2014
Author(s)
森一生
Organizer
第19回宮城CT診断・技術研究会
Place of Presentation
東北大学艮陵会館(仙台市)
Year and Date
2014-04-19
Related Report
Invited
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