Application of tuned-Aperture Computed Tomography in dentistry

比较不同光束投影阵列的调谐孔径CT（TACT）深度分辨能力。射束投影几何形状对于TACT重建图像的精确深度辨别是重要的。为了比较交互式TACT切片和传统牙槽骨图像在上颌埋伏切牙成像和定位方面的诊断信息产量，经IB批准，对20例患者进行了检查。比较TACT图像集与现有常规X线片（包括根尖周、咬合、旋转全景和/或侧位头颅X线片）的诊断效用。16名牙医独立评估了阻生牙的图像清晰度和选定的周围解剖细节。临床评估的置信度估计与TACT影响治疗计划修改的潜力的确定一起进行。研究了两个TACT切片。每个TA的组件投影数 ...更多信息 CT重建采用5层或6层锥形束投影阵列。基准标记物是X-Spot铅丸（Beekley，USA）。探测器为VG-ui（Trophy diology，法国/Yoshida Dental Corporation，日本）。TACT显著改善了对阻生牙颊/腭位置及其与相邻牙齿关系的描述（p <0.0001），而与头颅侧位片的可用性无关。临床决策的主观评估与TACT相比，置信度增加了约10%。TACT增加的诊断率因病例而异。TACT能清楚显示垂直阻生牙的形态和位置;然而，水平阻生牙的信息获取较少，交互式2D TACT切片在评估阻生上颌切牙及其与周围组织的关系方面比传统方法更具诊断价值。TACT偶尔会改变治疗选择。少

To compare depth discrimination by using Tuned-Aperture Computed Tomography (TACT) variously beam projection arrays. Beam projection geometry is important for the accurate depth discrimination of TACT reconstructed images. A conical beam array is ideal.To compare the diagnostic information yield of interactive TACTslices and conventional dento-alveolar images for the imaging and localization of impacted maxillary incisor teeth.With IB approval, 20 patients were examined. TACT image sets were compared for diagnostic utility against available conventional radiographs including periapical, occlusal, rotational panoramic and/or lateral cephalograms. Sixteen dentists independently evaluated the image clarity of the impacted tooth and selected surrounding anatomic details. Estimation of confidence in clinical assessment was made together with determination of TACT's potential for effecting treatment plan modifications. Both TACT slices were studied. The number of component projections per TA … More CT reconstruction was either five or six a conical beam-projection array was employed in every case. The fiduciary marker was an X-Spot lead pellet (Beekley, USA). The detector was an VG-ui (Trophy adiology, France/Yoshida Dental Corporation, Japan).TACT significantly improved depiction of the buccal/palatal position of the impacted tooth and its relationship with adjacent teeth (p〈0.0001)irrespective of the availability of lateral cephalograms. Subjective assessments for clinical decision-making approximated a 10% increase in confidence ratings with TACT. The added diagnostic yield with TACT varied from case to case. Morphology and position of vertically impacted teeth were clearly demonstrated by TACT ; however, horizontal impadtions occasioned less perceived information gain.Interactive 2D TACT slices were perceived to be diagnostically more informative for assessing impacted maxillary incisor teeth and their relation to surrounded tissues than conventional methods in some but not all cases. TACT occasionally altered treatment option selection. Less