数字乳腺X线摄影曝光模式对乳腺体模图像质量和辐射剂量的影响

发布时间：2018-05-09 06:37

本文选题：体模 + 管电流量　；参考：《吉林大学学报(医学版)》2015年05期

【摘要】：目的:比较数字乳腺X线摄影曝光模式对乳腺体模图像质量和辐射剂量的影响,为乳腺癌的影像诊断提供依据。方法:将乳腺体模一次成像。自动曝光模式,分别应用低剂量(Dose)、标准(STD)和高对比度(CNT)3种曝光模式;手动曝光模式,固定管电流量32 mAs,分别改变管电压为25、26、27、28、29、30、32、34、36、38和40kV曝光11次;固定管电压29kV,分别改变管电流量为20、32、40、45、56、63、80、100、125、160和200mAs曝光11次。记录各曝光参数下平均腺体剂量(AGD)值,并根据美国放射学会(ACR)评分标准对图像质量进行评价。结果:3种自动曝光模式下,模拟纤维组织的图像质量评分比较差异有统计学意义(P=0.00),模拟钙化和模拟团块的图像质量评分比较差异无统计学意义(P=0.37)。手动曝光模式下,固定管电流量32mAs,改变管电压或固定管电压29kV,改变管电流量曝光,3种模拟病变图像质量评分比较差异均有统计学意义(P=0.00),但3种模拟病变的图像质量评分受管电压或管电流量增加而且引起的变化趋势不同。管电流量或管电压变化对模拟纤维组织的图像评分影响最大,对模拟钙化的图像评分影响最小。自动曝光模式以低剂量模式AGD值最低,高对比度模式AGD最高;手动曝光模式时,AGD随管电压和管电流量增加而增加,均呈正相关关系(R2=0.998,P=0.000;R2=0.979,P=0.000)。结论:数字乳腺X线摄影时,可采用自动曝光的低剂量模式行乳腺癌筛查。使用手动曝光模式行常规临床检查能有效降低辐射剂量。
[Abstract]:Objective: to compare the effect of digital mammography exposure mode on breast phantom image quality and radiation dose, and to provide evidence for the diagnosis of breast cancer. Methods: mammary gland phantom was imaged at one time. Three kinds of exposure modes were used, I. E. automatic exposure mode, low dose Dosetor, standard STD) and high contrast, and manual exposure mode, fixed current 32 mAs. the voltage of the tube was changed to 2526 / 26 / 27 / 28 / 30 / 32U / 33338 and 40kV to 11 / 33338 respectively. The voltage of fixed tube was 29kV, the current of the tube was changed to 20 ~ 32o 40 ~ (40) V ~ (45) ~ (65) ~ (65) C ~ (65) C ~ (60) 100 ~ (125) 160 and 200mAs exposure to 11 times respectively. The average glandular dose (AGD) values under various exposure parameters were recorded and the image quality was evaluated according to the ACR-scale of the American Society of Radiology. Results there was significant difference in image quality score between simulated fiber tissue and simulated mass under three kinds of autoexposure mode, but there was no significant difference in image quality score between simulated calcification and simulated mass. In manual exposure mode, There were significant differences in the image quality scores of the three kinds of analog lesions by changing the tube voltage or fixed tube voltage (29kV), changing the tube current exposure voltage (29kV) by the fixed tube current (32mAs), and comparing the image quality scores of the three kinds of analog lesions. However, the image quality scores of the three kinds of simulated lesions were subject to the tube voltage or The current of the tube increases and the change trend is different. The influence of tube current or tube voltage on the image score of simulated fibrous tissue was the greatest, and that of simulated calcification was the least. The AGD value of low dose mode was the lowest, and that of high contrast mode was the highest, while that of manual exposure mode increased with the increase of tube voltage and current, and there was a positive correlation between them. Conclusion: automatic exposure low dose mode can be used to screen breast cancer in digital mammography. Routine clinical examination using manual exposure mode can effectively reduce radiation dose.
【作者单位】：重庆医科大学附属第一医院放射科;
【基金】：国家卫计委临床重点专科建设项目资助课题[国卫办(2013)544号] 重庆市卫生局科研基金资助课题(2013-2-003)
【分类号】：R737.9;R730.44

【参考文献】