| Project/Area Number |
14571801
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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 |
病態科学系歯学(含放射線系歯学)
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| Research Institution | Tokyo Dental College |
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Principal Investigator |
HAYAKAWA Yoshihiko TOKYO DENTAL COLLEGE, DEPARTMENT OF DENTISTRY, LECTURER, 歯学部, 講師 (70164928)
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| Co-Investigator(Kenkyū-buntansha) |
OTONARI Takamichi TOKYO DENTAL COLLEGE, DEPARTMENT OF DENTISTRY, ASSISTANT, 歯学部, 助手 (20340060)
渋谷 仁志 東京歯科大学, 歯学部, 助手 (80246347)
山本 一普 東京歯科大学, 歯学部, 講師 (50174785)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2002: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | TACT / hologram / three-dimensional imaging / stereography / virtual cursor / 3D-reconstruction |
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| Research Abstract |
(1)Reconstructed two-dimensional(2D) slices, which were generated by the Tuned-Aperture Computed Tomography(TACT) algorithm, an interactive, low-dose, low-cost, three-dimensional tomo-synthesis system, were applied for three-dimensional dento-alveolar imaging. The diagnostic task we examined was the assessment of impacted maxillary teeth. 2D slices and pseudo-holograms were found to significantly improved depiction of the buccal/palatal position of the impacted tooth. TACT was perceived to improve depiction of the buccal/palatal position of the impacted tooth and its relationship with adjacent teeth (p<.0001). TACT outperformed conventional images in terms of both subjective assessments for clinical decision making.
(2)Further we evaluated the comparative diagnostic value of tomo-synthesis, pseudo-hologram and 3D(three-dimensional)-CT images. Pseudo-holograms as well as 2D slices generated by TACT. Reconstructed 3D-images of multi-detector row CT are comparatively evaluated as the depth
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discrimination and the diagnostic utility for the localization of impacted tooth and surrounding anatomic details. 2D slices and pseudo- holograms were found to significantly improved depiction of the buccal/palatal position. In cases of horizontal impaction, pseudo-holograms as well as 3D-CT were preferred to 2D slices. TACT occasionally altered treatment option selection.
(3)Furthermore, glasses-free stereoscopic liquid-crystal display was applied to displaying dento-alveolar images. Due to the progress of 3D-viewing technology of the flat TFT display, the glasses-free stereoscopic display is available. Therefore, we examined to use a 3D-viewing display without eye-glasses to improve the recognition of 3D anatomical structure. 3D data set was easily modified by the provided software for the specific 3D-viewing system. The creation of contents for 3D-viewing is almost automatically performed. The spatial perception utilizing virtual cursor was depended on the number of views. The depth perception toward dento-alveolar structures somewhat improved by the stereoscopic view nevertheless observers were less attuned to the 3D-viewing display. Less
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