A study of development of digital X-ray radiograpy technique for temporomandiblar joint (reconstruction of tomographic images, using X-ray TV system)

颞下颌关节数字X射线摄影技术的发展研究（断层图像重建，利用X射线电视系统）

• 批准号: 60870073
• 负责人: HAYAMI Akimune
• 金额: $ 6.4万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60870073/
• 关键词: Tomography; TMJ; Digital image processing; Tomographic image reconstruction; 立体表示; 合成断層法; デジタル・ラジオグラフィ; 3次元再構成; 画像処理; 3次元表示

The purpose of this study was to get multiple slice of tomographic images of TMJ, by applying the digital image processing to the image sequence of only single hypocycloidal tomographic scan, and to realize 3D display of TMJ, and 3D measurement of condyle-fossa-distance(CFD), using these tomographic images.For preprocessing, correction method of X-ray TV image distortion was developed by image processing software.Two digital image processing method for reconstruction of tomographic image were made. One is a method which use shift of image for reconstruction of tomographic image. Another is one, which use a 3D back projection (2D back projection is applied in X-ray CT) for reconstruction of tomographic image. In comparison of these two methods, image shift method was better than 3D backprojection method concerning reconstruction time in this system. Application of edge enhance processing to all the X-ray TV image before reconstructing the tomographic image was sharpened, and blur was re … More duced, and true border line of TMJ became easily recognizable.Using 42 slices of TMJ image at a interval of 0.5mm, reconstructed on this system, true border line of TMJ was traced, and 3D coordinates of condyle and fossa were digitized. According to these 3D coordinates, 3D images of TMJ were displayed on the CRT of graphic terminal LEX-90. Wire-frame method, constant shading method, and smooth shading method were implemented for 3D display of TMJ. For allowance to see the back-facing condylar head, translucent mode was applied for a rendering the fossa. As a result, the relationship between fossa and condyle was able to be recognized visually. In addition, 3D measurement of CFD was performed, and these values were mapped on the 3D TMJ display. This 3D coior display makes it easy to recognize the dislocation of condyle.For next step, introduction of array processor or digital signal processor to this system is desirable for improvement of the system performance, and development of the new image processing method is worth doing for getting a shsrper tomographic image. Less

本研究的目的是将数字图像处理应用于单次内摆线CT扫描序列，获得多层的TMJ断层图像，并利用这些断层图像实现TMJ的三维显示和髁状突窝距(CFD)的三维测量。在预处理方面，利用图像处理软件建立了X射线电视图像失真的校正方法。一种是利用图像移位重建层析图像的方法。另一种是使用三维反投影(二维反投影在X射线CT中应用)重建层析图像的方法。在两种重建方法的比较中，图像移位法在重建时间上优于3D反投影法。在重建层析图像之前，对所有的X射线电视图像进行边缘增强处理，并对模糊进行…利用42层间隔0.5 mm的TMJ图像，在该系统上重建出TMJ的真实边界线，并对其进行数字化处理。根据这些三维坐标，在LEX-90图形终端的CRT上显示TMJ的3D图像。采用线框法、恒定明暗处理和平滑明暗处理三种方法实现了TMJ的三维显示。为了能够看到后向的髁突头部，采用半透明模式对颅窝进行渲染。因此，能够直观地识别颅窝和髁突之间的关系。此外，还进行了CFD的三维测量，并将这些值映射到3D TMJ显示器上。在下一步中，为了提高系统的性能，需要将阵列处理器或数字信号处理器引入到该系统中，而开发新的图像处理方法以获得更好的断层图像是值得做的。较少

项目成果

DENT MAXILLO FACIAL RADIOLOGY. SUPP.-7. (1985)

DENT MAXILLO 面部放射学。