Development of X-ray tomographic system for dento-maxillo-facial region adopted with tomosynthesis theory

采用断层合成理论的牙颌面部X射线断层摄影系统的研制

• 批准号: 13557159
• 负责人: OKANO Tomohiro
• 金额: $ 8.45万
• 依托单位: Showa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13557159/
• 关键词: Radiography; Tomography; tomosynthesis; Caries; Impacted tooth; Digital; Image diagnosis; 三次元画像; X線画像; 断層

It is useful for three-dimensional (3D) imaging for diagnosis of human diseases. Tuned aperture computed tomography (TACT) is developed by Professor Richard Webber (Wake Forest University) that is one of 3D imaging modality. This TACT system is adopted the tomosynthetic thoorey. This system makes any tomographic images from several arbitrary positioned radiogram (basis images). Many investigators studied its ability of diagnosis for dento-alveolar lesion in vitro. TACT systems, however, used in these studies were designed for intra-oral use. Intra-oral use represents that X-ray sensor for TACT system is placed in oral cavity. This may cause patients discomfort. We developed extra-oral TACT system for dento-alveolar region to reduce patient discomfort without decreasing diagnostic ability. Our TACT system is two type, high-resolution and wide area extra-oral TACT system. The high-resolution system is consisted of CCD digital sensor and panoramic tomographic apparatus. The other wide area system consisted of photostimulable phosphor imaging plate and X-ray generator for general medical purpose. In both systems, X-ray sensor is placed at the skin surface of face nearest to the lesion. The diagnostic accuracy of approximal caries detection of the high-resolution system is better than intra-oral radiography. The accuracy of diagnosis of impacted mandibular third molors by wide area system is almost the same as that of intra-oral TACT system. These results show extra-oral TACT system that we are developed has clinical validity for dento-alveolar lesions with less patient discomfort.

它是有用的三维（3D）成像诊断人类疾病。调谐孔径计算机断层扫描（TACT）是由美国维克森林大学的Richard Webber教授开发的一种三维成像方式。该TACT系统采用了断层合成理论。该系统从几个任意位置的射线图（基图）生成任意层析图像。许多研究者研究了体外诊断牙槽牙病变的能力。然而，在这些研究中使用的TACT系统是为口服使用而设计的。口腔内使用是指将TACT系统的x射线传感器放置在口腔内。这可能会引起患者的不适。我们开发了牙槽区口腔外TACT系统，以减少患者的不适而不降低诊断能力。我们的TACT系统是两种类型，高分辨率和广域口外TACT系统。高分辨率系统由CCD数字传感器和全景层析仪组成。另一个广域系统由光刺激荧光粉成像板和一般医学用途的x射线发生器组成。在这两种系统中，x射线传感器被放置在最靠近病变的面部皮肤表面。高分辨率系统对近似龋的诊断准确率优于口腔内x线摄影。广域系统对下颌阻生第三磨牙的诊断准确率与口腔内TACT系统基本相同。这些结果表明，我们开发的口腔外TACT系统对牙槽病变具有临床有效性，患者的不适较少。