2000 Fiscal Year Final Research Report Summary
Development of medical x-ray imaging system using semiconductor array for reduction of patient dose
| Project/Area Number |
10557239
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Medical sociology
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| Research Institution | Fukui University of Technology |
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Principal Investigator |
KANAMORI Hitoshi Fukui University of Technology, Electrical Engineering, professor, 工学部, 教授 (70027770)
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| Co-Investigator(Kenkyū-buntansha) |
TAKIGAWA Atsushi Hiroshima Prefectural College of Health Sciences, Faculty of Health Sciences, Department of Radiological Sciences, professor, 教授 (80197227)
KUBOTA Hideaki Osaka University, Faculty of Medicine, research associate, 医学部, 助手 (30234496)
MATSUMOTO Masao Osaka University, Faculty of Medicine, associate professor, 医学部, 助教授 (50149944)
SATO Toshiyuki Shimadzu Corporation, Basis Research Laboratory, chief scientist, 基盤研究所, 主任研究員
ARIMURA Hidetaka Hiroshima International University, Faculty of Health Sciences, Department of Clinical Engineering, lecturer, 保健医療学部, 講師 (20287353)
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| Project Period (FY) |
1998 – 2000
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| Keywords | medical x-ray image / semiconductor array / CdTe semiconductor detector / patient dose / image quality / antiscatter grid / 粒状のウィナースペクトル / 再適撮影条件 |
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| Research Abstract |
(1) Using the traveling heat method for the crystal growth of CdTe semiconductor, uniformity and stability of semiconductor detector array were improved.
(2) Digital chest images were made using a CdTe semiconductor detector array having 3000 pixels. The spatial resolution was inferior compared with those made using screen-film systems, but the density resolution was superior. This suggests the utility of the compression of the dynamic range in the image processing.
(3) Measurements of x-ray spectra using a CdZnTe semiconductor detector system for 50-150 kV and 25-35 kV x-ray generators were performed.
(4) Factors of antiscatter grids (the scatter ratio, the Bucky factor and the contrast improvement fastor) were obtained from scatter and primary x-ray spectra.
(5) Small-angle scatter spectra witch were not removed by the grid were obtained. It was suggested that the small angle scatter could not be ignored.
(6) Tube voltage dependence of MTF's of screen-film systems were explained by the effect of scattered x rays. A new equation was proposed for thick screens, instead if Rossmann's equation.
(7) Threshold radiographic contrasts were considered. Using the psychophysical method, optimum exposure factors and edge enhancement effects were theoretically derived and confirmed by experiments.
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