全数字化乳腺X线成像系统空间分辨力及平均腺体剂量检测  

Test spatial resolution and average glandular dose of full field digital mammography system

作　　者：梁永刚[1] 付丽媛[1] 倪萍[2] 陈坚[1] 李威[2] 刘冰川[1] 陈建新[1] 陈自谦[1] 

机构地区：[1]福州总医院医学影像中心,福州350025 [2]福州总医院医学工程科福建省医学装备管理质量控制中心,福州350025

出　　处：《医疗卫生装备》2017年第7期73-76,共4页Chinese Medical Equipment Journal

基　　金：国家重点研发计划数字诊疗装备研发重点专项子课题(2016YFC0103103);福建省科技计划项目(2016I0010);南京军区重大课题(14ZX23)

摘　　要：目的:对全数字化乳腺X线成像系统的空间分辨力与平均腺体剂量(average glandular dose,AGD)进行检测,以保证最低剂量下获得高分辨力、高对比度的乳腺X线影像。方法:将M12乳腺X线机性能测试模体放置于乳房支撑台正中位置上,在该模体的基础上对准3个固定槽放置线对卡模体,开启自动曝光控制(auto exposure control,AEC),管电压28 k V,选择常用阳极滤过组合进行曝光,对成像系统的空间分辨力进行检测。采用福禄克TNT12000射线检测工具、2 mm厚的钢板及不同厚度的铝片测量出半值层(half-value layer,HVL),进而计算出AGD。结果:纵向空间分辨力均为8 lp/mm,横向空间分辨力最大为10 lp/mm,最小为8 lp/mm,均大于7 lp/mm,检测通过;所测AGD为0.60~0.61 m Gy,<2 m Gy,检测通过。结论:通过对全数字化乳腺X线成像系统的空间分辨力和AGD的检测,可以快速评估乳腺X线成像系统的性能及放射剂量,客观地反映设备的性能,从而保证良好的图像质量和最低的辐射剂量。Objective To test the spatial resolution and average glandular dose（AGD） of full field digital mammography system to obtain high-resolution and contrast breast X-ray images with the lowest dose. Methods The M12 breast X-ray performance test phantom was placed on the breast support center position, then line-pair card was put on the M12 phantom and fixed groove, and exposure was carried out with auto exposure control, 28 k V tube voltage and common anode filtration combination so as to detect the spatial resolution. Half-value layer（HVL） was measured by Fluke TNT12000 ray detection tools, 2 mm-thickness plate and aluminum sheets with different thicknesses, and then AGD was calculated accordingly.Results The spatial resolutions were all higher than 7 lp/mm and proved to meet the quality standard, which had the vertical spatial resolution being 8 lp/mm, the maximum value of the lateral spatial resolution being 10 lp/mm and the minimum value being 8 lp/mm. AGD was lower than 2 m Gy and then proved qualified which was limited within 0.60 and 0.61 m Gy.Conclusion The test of spatial resolution and AGD of full digital mammography system can assess the performance and radiation dose, reflect the performance of equipment, ensure image quality and lower radiation dose.

关 键 词：全数字化乳腺X线成像系统 空间分辨力 平均腺体剂量 乳腺X线影像 分辨力 对比度 

分 类 号：R730.44[医药卫生—肿瘤] R737.9[医药卫生—临床医学]