| CR与非晶体硅DR胸部摄影曝光剂量优化的探讨 |
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| 引用本文： | 曹国全,许化致,邰云鹏,吴恩福,郑祥武. CR与非晶体硅DR胸部摄影曝光剂量优化的探讨[J]. 中华放射医学与防护杂志, 2009, 30(6): 350-353. DOI: 10.3760/cma.j.issn.0254-5098.2010.03.033 |
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| 作者姓名： | 曹国全 许化致 邰云鹏 吴恩福 郑祥武 |
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| 作者单位： | 温州医学院附届第一医院放射科,325000; |
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| 基金项目： | 温州市科技局科技计划项目 |
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| 摘 要： | 目的 比较CR与非晶体硅DR在胸部摄影中入射剂量的差异,探讨两者最优化曝光剂量.方法 应用CR、DR分别别胸部模体行不同入射剂量曝光成像,记录模体表面入射剂量,用CDRAD2.0评估软件计算模体影像图像质量因子反数值IQFinv.CR组、DR组图像IQFinv差异用两独立样本t检验;CR组、DR组各自图像IQFinv与入射剂量的关系应用pearson相关;应用ROC曲线分析获取两组最佳图像IQFinv值,并换算曝光剂量.结果 CR和DR组入射剂量和图像质量IQFinv值之间呈明显的正相关(r=0.893、0.848,P<0.01),并存在线性回归.CR和DR组IQFinv值差异有统计学意义(t=5.455,P<0.05).ROC曲线分析(曲线下面积AUC=0.893,P<0.001),最佳IQFinv值为3.55.结论 CR、DR系统对于低对比度细节的检测能力均随着入射剂量的增加而增加.入射剂量相同时,DR系统对于低对比度细节的检测能力优于CR;在获得相同的图像质量时,与CR相比应用DR可大大降低被榆者辐射剂量.
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| 关 键 词： | 数字化摄影 图像质量 曝光剂量 质量控制 |
Investigation of optimum exposure dose for chest imaging using CR and amorphous silocon DR system |
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| CAO Guo-quan,XU Hua-zhi,TAI Yun-peng,WU En-fu,ZHENG Xiang-wu. Investigation of optimum exposure dose for chest imaging using CR and amorphous silocon DR system[J]. Chinese Journal of Radiological Medicine and Protection, 2009, 30(6): 350-353. DOI: 10.3760/cma.j.issn.0254-5098.2010.03.033 |
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| Authors: | CAO Guo-quan XU Hua-zhi TAI Yun-peng WU En-fu ZHENG Xiang-wu |
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| Abstract: | Objective To compare the difference of entrance dose between CR and amorphous silocon DR system in chest imaging, and to discuss their optimum exposure dose. Methods For CR and DR, different entrance dose was measured by dosimeter in chest phantom. The value of IQFinv was analyzed by CDRAD2. 0 software. Image quality difference between CR and DR was assessed by group t-test. The relationship between image quality and entrance dose was tested by using Pearson correlation analysis. The best IQFinv values in CR and DR system were achieved via ROC curve analysis, and the exposure dose was then calculated. Results There were direct correlation values between entrance dose and the value of IQFinv in CR and DR system, respectively( r =0. 893 ,0. 848 ,P < 0. 01 ) . The linear regression equation for DR was IQFinv =0. 0050 +3. 359, and for CR was IQFinv =0. 005D + I. 651 , where D was entrance dose. The difference of IQFinv value between CR and DR was significant(t = 5. 455 ,P < 0. 05). The best IQFinv value of the two groups from ROC analysis was 3.55. Conclusions With the entrance dose increased, the detection ability of contrast-detail was elevated in the two digital radiography systems. With equal entrance dose, the detection ability of DR in contrast-detail was superior to CR. With equal image quality, DR obviously decreased the radiation dose to the patients. |
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| Keywords: | Digital radiographyImage qualityExposure doseQuality control |
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