徳島大学 教育・研究者情報データベース(EDB)

1. 細木 眞紀([徳島大学.大学院医歯薬学研究部.歯学域.口腔科学部門.臨床歯学系.顎機能咬合再建学])

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2. 薩摩 登誉子([徳島大学.病院.診療科.歯科.かみあわせ補綴科(第二補綴科)]/->個人[田島 登誉子])

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3. 高橋 章([徳島大学.病院.診療科.歯科口腔外科.口腔外科])

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4. 西川 啓介

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5. 細木 秀彦([徳島大学.大学院医歯薬学研究部.歯学域.口腔科学部門.臨床歯学系.歯科放射線学]/[徳島大学.病院.診療科.歯科.歯科放射線科])

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6. 中野 雅德

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7. 坂東 永一

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8. 竹内 久裕

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9. 菅原 千恵子

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10. 岩崎 裕一

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(日) スパイラルCTを用いた顎関節の三次元評価法

(英) Three-dimensional (3-D) image reconstructed from Computed Tomography (CT) data is an ef>cient method to evaluate temporomandibular joint (TMJ) morphologically. Even the 3-D image reconstructed from spiral CT data has some distortion, typically along to the table feed direction, very few studies were reported about accuracy of reconstructed 3-D image size. The purpose of this research was to evaluate the distortion on 3-D image reconstructed with spiral CT (Somatom Plas4, Siemens Co, Germany) quantitatively. We used three imaging targets, eight ceramic balls placed at corners of cubic frame, a calibration cube that has the CT value nearly equal to cortex bone of human dried mandibular head. We evaluated relation between a threshold level of CT image processing and reconstructed 3-D image size with a custom-made computer program. CT data of ceramic balls clari>ed changes of the reconstructed image, -0.215mm for table feed direction and less than ±0.006mm for the other directions. The calibration cube was used for the arrangement of optimal scanning condition (reconstruction mode, collimation, reconstitution interval) and evaluation of reconstructed image size. The distortion of the image was +0.207mm for table feed direction and less than +0.029mm for the other directions. Changes of dried skull TMJ image reconstructed with the optimal scanning condition were -1.463mm for lateral direction of the condylar head, -0.956mm for back and forth direction and -0.580mm for table feed direction. Results of this research suggested that the level of the 3-D image distortion was mostly affected with the scanning condition. And the size of 3-D image was susceptible to the threshold level of CT image processing. Consequently, we think that the standardization of scanning condition should be concerned for the quantitative evaluation of 3-D TMJ image using CT data.

1. 顎関節(temporomandibular joint)
2. スパイラルCT(spiral CT)
3. (日) 三次元評価