Evaluation of 3-D Image Accuracy of Human Temporomandibular Joint Image that was Reconstructed from Spiral CT Data

根据螺旋 CT 数据重建的人体颞下颌关节图像的 3D 图像精度评估

• 批准号: 13672038
• 负责人: HOSOKI Maki
• 金额: $ 2.11万
• 依托单位: The University OF Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13672038/
• 关键词: temporomandibular Joint; spiral CT; temporomandibular Joint space; three-dimensional reconstruction; CT threshold; 顎関節三次元形態; 定量的評価

Three-dimensional image of temporomandibular joint that was reconstructed from spiral CT data may have much diagnostic information. Several researches reported about the combination of 3-D TMJ image and six-degrees-of-freedom jaw movement data for the evaluation of jaw function. Very few studies have reported about accuracy of these 3-D images. The purpose of this research is to investigate the optimal scanning condition of spiral CT image and the distortion of reconstructed 3-D images3-D TMJ image of dry human skull was taken with spiral CT (Somatom Plus 4, Siemens Co). Same material was also scanned with 3-D digitizer (Microcode FN503, Mitsutoyo Co) to evaluate actual size of the imaging sample. Comparison of these two images was done with computer graphics. With the finest scanning condition, maximum error of the CT image was less than 2% and this accuracy was sufficient enough to evaluate slight inter joint space of TMJDistortion of CT image was mostly affected by table feed speed. Cut level CT number was very influential for size of CT image. When cortex bone CT number was applied as the cut level, size of the 3-D TMD image became 10 % smaller than that of actual TMJIt would be concluded that the standardization of scanning condition should be concerned for the evaluation of 3-D TMD image using CT dataPart of this research was presented at the 81 st General Session and Exhibition of the International Association for Dental Research, Goteborg, Sweden, June 25-28, 2003

颞下颌关节螺旋CT重建的三维图像具有丰富的诊断信息。多项研究报道了结合三维TMJ图像和六自由度颌骨运动数据进行颌骨功能评价。很少有研究报道这些3D图像的准确性。本研究的目的是探讨螺旋CT图像的最佳扫描条件和重建三维图像的失真。还用3-D数字化仪（Microcode FN 503，Mitsutoyo Co）扫描相同的材料以评价成像样品的实际尺寸。这两个图像的比较是用计算机图形学完成的。在最佳扫描条件下，CT图像的最大误差小于2%，此精度足以评价TMJ微小间隙。CT图像的畸变主要受工作台进给速度的影响。切割水平CT数对CT图像的大小影响很大。以皮质骨CT值作为切割水平时，三维TMD图像的尺寸比实际TMJ的尺寸小10%。由此得出结论，在使用CT数据评价三维TMD图像时，应关注扫描条件的标准化。二○ ○三年六月二十五日至二十八日