参数自动优化模式选择对乳腺DR图像质量及平均腺体剂量影响的评估

目的:评估不同的参数自动优化(AOP)曝光模式对乳腺数字化放射成像(DR)图像质量和平均腺体剂量的影响,为乳腺DR摄影的质量及剂量控制提供参考.方法:选用AOP提供的剂量(DOSE)模式、标准(STD)模式和对比度(CNT)模式三种曝光模式对乳腺模体进行曝光,每种曝光模式重复4次,记录每次曝光的平均腺体剂量(AGD).然后由两位资深的乳腺影像诊断医师分别在同一乳腺图像工作站的5MP显示器上观察,独立对所获得的12幅乳腺模体图像按美国放射学会(ACR)推荐方法评分.所有曝光数据和评分数据进行统计学分析.结果:在相同压力和乳腺厚度条件下,DOSE曝光模式的AGD最低,STD、CNT曝光模式下的AGD较之分别增加了21.9%、146.2%;3组12幅图像质量均通过ACR评分,3组图像数据分析差异无统计学意义(P＞0.05).结论:乳腺DR的AOP曝光模式选择中,CNT模式的AGD明显增高.应警慎使用,DOSE模式能有效降低AGD,并且对图像质量无明显影响.

Assessment of the Effect of Automatic Optimization Parameter Mode on Mammary Gland DR Image Quality and Average Gland Dose

Objective:To investigate whether different automatic optimization parameter modes affect DR image quality of mammary gland and average gland dose,and to provide reference for the DR image quality of mammary gland and dose control.Methods:Breast phantom was exposed to DOSE,STD,CNT exposure modes offered by AOP.Every exposure was repeated 4 times and average gland dose was recorded.All the images were analyzed in the same gland image work station by 2 senior image diagnosis doctors on 5MP monitor,all images were scored according to ACR standard.The exposure data and the score data were statistically analyzed.Results:With the same pressure and gland thickness,the AGD was the lowest with DOSE exposure mode,with STD,CNT exposure modes,the AGD increased 21.9% and 146.2%,respectively.12 images of the 3 groups were all scored by ACR standard,there was no statistical significance of the 3 group image data analysis(P>0.05).Conclusion:DOSE exposure mode can decrease AGD in the AOP mode during mammary gland DR,and there is no effect on image quality.Since the AGD increases obviously when using the CNT exposure mode,CNT exposure mode should not be used.