1992 Fiscal Year Final Research Report Summary
DEVELOPMENT OF EXPERT SYSTEM FOR HIGH-SPEED 3D COMPUTED TOMOGRAPHY
| Project/Area Number |
03557048
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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 |
Radiation science
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
OHYAMA Nagaaki TOKYO INSTITUTE OF TECHNOLOGY, DEPT. OF ENGINEERING,ASSOCIATE PROF., 工学部, 助教授 (50160643)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Masahiro TOKYO INSTITUTE OF TECHNOLOGY, DEPT. OF ENGINEERING, RESEARCH ASSOCIATE, 工学部, 助手 (10220279)
HONDA Toshio TOKYO INSTITUTE OF TECHNOLOGY, DEPT. OF ENGINEERING, ASSOCIATE PROF., 工学部, 助教授 (10016503)
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| Project Period (FY) |
1991 – 1992
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| Keywords | 3-D IMAGE PROCESSING / COMPUTER GRAPHICS / COMPUTED TOMOGRAPHY / OPTICAL INFORMATION PROCESSING / EXPERT SYSTEMS |
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| Research Abstract |
A practical investigation on 3-D X-ray computed tomography (CT) using con-beam projections is done and the system for the visualization of 3-D data is developed in this project. Whole 3-D data are acquired only with a rotation of a X-ray source and detector pair. 3-D images are experimentally reconstructed from the projections of phantoms and live subject. 3-D images of high-resolution bone structures are obtained using magnified projection geometry.
The 3-D imaging technique of coronary artery is also investigated. The 3-D image of blood vessels is reconstructed using simulated annealing algorithm through the experiment. It is possible to image coronary artery from venography by this method, which is valuable for the diagnosis of heart disease.
We construct the expert system to observe 3-D volume data that are acquirecd from 3-D CT systems. A new method for the visualization of volume data using optical model is developed and implemented in the system. High speed interactive operation is possible with electro-optical hybrid processing. The operator can change the mapping table between CT numbers to optical constants, and can generate images of fuzzy surfaces. In the experiment, the images of skull, muscle, soft tissues, and brain are reconstructed from CT data. 3-D structures of such subjects, which is difficult to observe three-dimensionally through conventional method, are visualized with rotation through this system.
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