| 孙雪梅.医学影像诊断中环境光亮度对读片效果的影响[J].中国医学影像技术,2008,24(3):447~449 |
| 医学影像诊断中环境光亮度对读片效果的影响 |
| The image quality associated with reflections from the display surface depend on the level of ambient lighting |
| 投稿时间：2007-11-18 修订日期：2008-01-28 |
| DOI： |
| 中文关键词: 亮度 接受者操作特性曲线 |
| 英文关键词:Luminance Receiver operating curve |
| 基金项目: |
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| 摘要点击次数: 1416 |
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| 中文摘要: |
| 目的 由于临床医学信息数字化和医院信息化的建设与发展,医学影像信息实现了网络传输存储和网络诊断。在数字化放射成像的过程中,除了成像设备的性能及诊断医师的认知能力外,环境条件,即诊断环境的情况同样直接影响着成像质量和诊断效果。本文尝试从环境因素入手,考察诊断环境中不同光照的情况下,图像的读取效果有什么区别,以期获得最佳的光照条件。 方法 该研究基于信号识别理论和接受者操作特性曲线(ROC)的分析原理,利用TRM 18-209型ALVIM ROC模板,通过改变诊断环境光亮度,分别调查了不同年资的医学影像诊断医师对同一幅ROC模板图像,在相同窗宽、窗位的情况下产生的不同观测效果,通过细节检测的真阳性和假阳性概率来反映对图像细节的检出能力。该方法简单、直观,完全满足对于成像系统特性的测量要求。 结果 初步获取的最佳环境参数为:X射线诊断读片室的亮度大约为0.63~3.18 cd/m2,CT/MR/NM读片室的亮度大约为 4.78~19.1 cd/m2之间。 结论 通过不同光亮度下对同一模板图像的ROC曲线的分析结果表明:在常规医学影像诊断环境中,随着诊断环境亮度的增加,对图像细节的检出能力也随之下降。 |
| 英文摘要: |
| Objective Based on clinical medicine information digitization and the construction and development of hospital informatization, the medical image information has realized the network archiving and communication and network diagnosis. Besides the performance of imaging equipments and the cognition ability of diagnosticians, the diagnosis environmental conditions affect similarly the imaging quality and the diagnosis effect directly during the process of digital radiation imaging. To start with environmental factors to review the difference in image reading effects under different ambient illumination. To expect to obtain the optimal illumination conditions. Methods Medical image diagnosticians of different seniority are invited to participate in this study. Based on signal identification theory and receiver operating characteristic curve (ROC) analysis approach, we altered the ambient illumination of diagnosis environment to investigate separately the different observation effects on the same ROC pattern image under identical window width and window level. The detection capability of image details was reflected through the true positive rate and false positive rate of details detection. Results The optimal illumination parameters were obtained. The luminance is approximately 0.63—3.18 cd/m2 in X-ray diagnosis film reading room. That is approximately 4.78—19.1 cd/m2 in CT/MR/NM film reading room. Conclusion The analysis results show that the detection capability of image details fell down with the increase of the level of ambient illumination in routine medical image diagnosis environment. |
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