| Project/Area Number |
08672300
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Surgical dentistry
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MORIYA Yoshiyuki Kyoto University Graduate of Medicine, Assistant Professor, 医学研究科, 助手 (70221637)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Hiroaki Kyoto University Graduate of Medicine, Assistant Professor, 医学研究科, 助手 (40260624)
MURAKAMI Kenichiro Kyoto University Graduate of Medicine, Associate Professor, 医学研究科, 助教授 (00174269)
TSUTSUMI Sadami Kyoto University Research Center for Biomedical Engineering, Professor, 生体医療工学研究センター, 教授 (00028739)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | temporomandibular joint / MRI / 3D imaging / disk / surface model / voxel model / personal computer |
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| Research Abstract |
Magnetic Resonance Imaging (MRI) is widely utilized for diagnosis of the temporomandibular joint disease. Three dimensional imaging of the temporomandibular joint is more appropriate than two dimensional imaging to discuss the relationship between clinical symptoms and disk abnormality.
We developed a system to reconstruct a three dimensional (3-D) imaging of the temporomandibular joint (TMJ) from MR images. The 1.5 Tesla superconductive magnet system was applied to get series frontal and sagittal sections of TMJ with 3mm slice thickness and 3mm interval. Outline of fossa, eminence, condyle and disk were traced and digitized from MRI films. After 3D sagittal wireframes were calculated from those 2D outlines data, interpolations between each sagittal wireframe were performed in accordance with frontal sections. Then, 3D surface model was reconstructed from wireframes and projected the the monitor to display steric figures.
3D surface model could not be adapted only to disk perforation cas
… More
e. Therefore it is necessary for managing all cases of TMJ disease to develop a new system using voxel model. In order to obtain a smooth three dimensional (3D) figure of the temporomandibular joint (TMJ) from MR images utilizing voxel model, many slices of MRI sagittal sections are required. 3D Fast GRASS method could supply more than 60 series of MR images with 0.4mm slices from volume scanned TMJ data. The parameters of this method were TR : 28.5, TE : 8.9, flip angle : 20 degree, FOV : 10*10cm, slice thickness : 0.7mm, data matrix : 256*192 and NEX : 2. Scan time was 9 minutes and 10 seconds. We prepared good surroundings for voxel model to input digital information of the MRI film to the personal computer. The TMJ 3D reconstructive image was greatly improved in smoothness and accuracy by use of 3D Fast GRASS method.
3D reconstructive images from MRI are expected to be adapted to clinical use because clear information are given about relation in position of the fossa, eminence, condyle and disk, and disk configuration of both lateral and medial sections. Less
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