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首页> 外文期刊>Indian Journal of Dental Research >Effect of different exposure times on caries detection and pixel value in a wireless digital system
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Effect of different exposure times on caries detection and pixel value in a wireless digital system

机译：无线数字系统中不同曝光时间对龋齿检测和像素值的影响

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Objectives: The aim of this study was to assess, using the CDR Wireless?, the effect of different exposure times on caries detection and pixel intensity values. Materials and Methods: Forty teeth were x-rayed using a Schick CDR Wireless sensor at eight different exposure times – 0.06, 0.10, 0.13, 0.16, 0.20, 0.25, 0.30, and 0.32 s. Four observers evaluated the images for presence of carious lesions scoring proximal surfaces of each tooth on a 5-point scale. Scores were compared to histological sections of the teeth. Accuracy was evaluated by means of ROC curve analysis. Radiographs of an aluminum step wedge were obtained using the same eight exposure times. Pixel intensity measurements were obtained, and mean pixel values were statistically analyzed using linear regression. Results: The Az for each exposure time varied from 0.53 to 0.62. Two-way analysis of variance and Tukey test demonstrated that the exposure time of 0.25 s presented the best result and was significantly higher than 0.30 s and 0.35 s. In regard to mean pixel values, two different behaviors were observed, and the exposure time of 0.20 s presented mean pixel values in both phases. Conclusion: The performance of the exposure times from 0.06 s to 0.25 s was satisfactory for proximal caries detection, and 0.25 s is the best as indicated for this finality. Clinical Relevance: Considering that a reduction of exposure time represents a reduction of patient exposure dose, and this reduction cannot neglect image quality, the behavior of any digital system must be carefully evaluated.
机译：目的：本研究的目的是使用CDR Wireless？评估不同暴露时间对龋齿检测和像素强度值的影响。材料和方法：使用Schick CDR无线传感器以八种不同的曝光时间对40颗牙齿进行X射线检查-0.06、0.10、0.13、0.16、0.20、0.25、0.30和0.32 s。四个观察者以5分制评估了图像中是否存在龋齿病变，这些病变在每个牙齿的近端表面评分。将分数与牙齿的组织学切片进行比较。通过ROC曲线分析评估准确性。使用相同的八次曝光时间获得铝台阶楔的射线照片。获得像素强度测量值，并使用线性回归对平均像素值进行统计分析。结果：每次曝光时间的Az值从0.53到0.62。方差和Tukey检验的双向分析表明，0.25 s的暴露时间表现最佳，并且显着高于0.30 s和0.35 s。关于平均像素值，观察到两种不同的行为，并且0.20 s的曝光时间表示两个阶段的平均像素值。结论：从0.06 s到0.25 s的暴露时间表现对于近端龋齿检测是令人满意的，并且0.25 s是这种最终结果所表明的最佳。临床意义：考虑到减少曝光时间代表减少患者的曝光剂量，并且这种减少不能忽略图像质量，因此必须仔细评估任何数字系统的行为。

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