1987 Fiscal Year Final Research Report Summary
Analysis of exposure technique of computed radiography
| Project/Area Number |
61570508
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Radiation science
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| Research Institution | Kyoto University |
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Principal Investigator |
NAKANO Yoshihisa Department of Nuclear Medicine, Faculty of Medicine Kyoto University, 医学部, 講師 (70115898)
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| Co-Investigator(Kenkyū-buntansha) |
ITOH Harumi Department of Nuclear Medicine, Faculty of Medicine Kyoto University, 医学部, 助教授 (40026943)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Computed Radiography / 画像処理 |
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| Research Abstract |
For proper x-ray data acquisition and image display in Computed Radiography(CR), it is necessary to know the dynamic ranges of the detector and display, and also of the subject being radiographed. We have developed a computer program which enables to measure the dynamic range of the subject. In the conventional radiographic techniques, we kept the dynamic range of the subject within the dynamic range of the film by changing the exposure factors. Exposure techniques should be reconsidered to take full advantage of CR, because the images with wide dynamic range show effectiveness of the picture processing, particularly spatial filtering.
We have developed an automatic measurement system of acetabular angle which is a diagnostic parameter of congenital hip dislocation (LCC) using a computed radiography. Because of improved low-contrast detectability of the CR, the angle can be measured under one-twentieth X-ray dose comparing with conventional system.
A network using fiber-optic ring architecture has been implemented to connect X-ray CT, with an image work-station and optical disk storage unit. The work-station has three, non-interlaced CRT monitors of 1024x1024 pixels. The optical disk system stores 32 optical disk cartridges (2.6Gbyte/cartridges). On-line date acquisition, long-term archiving, and CT and CR interpretation using CRT have been tested and the system has been working for 6 months in clinical environment.
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Research Products
(11 results)
