Dento-alveolar three-dimensional imaging utilizing TACT tomo-synthesis, stereography and virtual cursor

(1)利用交互式、低剂量、低成本的三维CT合成系统--调谐孔径CT(TACT)算法生成重建的二维(2D)切片，用于牙槽骨三维成像。我们检查的诊断任务是评估上颌阻生牙齿。2D切片和伪全息图被发现显著改善了对阻生牙的颊/腭部位置的描绘。TACT被认为能更好地描述阻生牙的颊/腭部位置及其与相邻牙齿的关系(p&lt；.0001)。在临床决策的主观评价上，TACT图像均优于传统图像。(2)进一步评价了断层合成、伪全息和三维CT图像的诊断价值。伪全息图以及由TACT生成的2D切片。将多排螺旋CT重建的三维图像作为深度…进行对比评价对埋伏牙和周围解剖细节的定位有更多的辨别力和诊断作用。2D切片和伪全息图被发现显著改善了颊/腭部位置的描绘。在水平嵌塞的情况下，伪全息图和3D-CT优于2D切片。Tact偶尔改变治疗方案的选择。(3)采用免眼镜立体液晶显示器显示牙槽骨图像。由于平板TFT显示器的3D观看技术的进步，无眼镜立体显示器成为可能。因此，我们研究了使用不戴眼镜的3D观看显示器来提高对3D解剖结构的识别。为特定的3D观看系统提供的软件可以很容易地修改3D数据集。创建用于3D观看的内容几乎是自动执行的。利用虚拟光标的空间感知依赖于视点的数量。通过立体观察，牙槽结构的深度知觉有所改善，然而观察者对3D观察显示的协调性较差。较少

(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 … More 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