| Project/Area Number |
03555080
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子機器工学
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| Research Institution | University of Electro-communications |
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Principal Investigator |
HASEGAWA Shin Univ.of Electro-communications Prof., 電気通信学部, 教授 (60017308)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEDA.TOHORU The University of Tsukuba Lectur., 臨床医学系, 講師 (10197311)
AKATSUKA Takao Yamagata University Prof., 工学部, 教授 (80091875)
NISHIMURA Katsuyuki Saitama Medical school Ass.Prof., 医学部, 助教授 (10129158)
HYODO Kazuyuki National Lab. for High Energy Phys. Assist., 放射光実験施設, 助手 (60201729)
ANDO Masami National Lab. for High Energy Phys. Prof., 放射光実験施設, 教授 (30013501)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥10,600,000 (Direct Cost: ¥10,600,000)
Fiscal Year 1992: ¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1991: ¥5,000,000 (Direct Cost: ¥5,000,000)
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| Keywords | Angiography / Coronary Angiography / Energy Subtraction / K edge Subtraction / D S A / X-ray Television / シンクロトロン放射 / 画像処理 / Kエッジエネルギ-差分 / 冠動脈診断 |
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| Research Abstract |
A K-edge subtraction television system was developed utilizing a high speed monochromator, two CCD camera systems, two laser video disc recorders and an image processing system combined with a synchrotron radiation system. After injection of contrast medium (iodine), the subject is irradiated by monochromatized dual energy X-ray flux closely bracketing the K-edge energy of iodine, alternately. The subtraction images derived from each pair of the X-ray images visualizes contrast medium only. Continuous flow of the contrast medium in vessel can be observed by a serial display of the processed images.
The system was improved to obtain clear subtraction images of coronary arteries, as follows:
1, An electronic driving monochromator was introduced in order to synchronize the X-ray energy change and the TV frame.
2, Frame transfer CCD cameras were utilized to improve vertical resolution.
3, The image processing algorithm was investigated to improve image quality, comparing the characteristics of the system with that of a conventional DSA system.
This system has been used to display a coronary artery of an anesthetized dog and the obtained images were shown as real time VCR images at the BSR Conference held in Tsukuba, Japan, at Sept. 1992.
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