尘肺病诊断中数字化X线摄影图像后处理的优化  

Optimization of digital chest radiography image post-processing in diagnosis of pneumoconiosis

作　　者：盛炳镛[1] 毛翎[2] 周韶炜[2] 施瑾[2] 

机构地区：[1]同济大学附属上海市肺科医院影像科,上海200433 [2]同济大学附属上海市肺科医院尘肺科,上海200433

出　　处：《中华劳动卫生职业病杂志》2013年第11期825-829,共5页Chinese Journal of Industrial Hygiene and Occupational Diseases

摘　　要：目的建立数字化X线摄影（DR）最佳图像后处理参数，为将DR技术引入我国尘肺病诊断进行前期研究。方法以204例尘肺患者和31例粉尘作业工人为研究对象，同期拍摄传统屏一片（FSR）胸片和DR胸片。在美国GE公司DR设备工作站改变图像后处理参数打印胶片，由尘肺病专家进行图像层次感、肺纹理、胸椎显影等的评定，选择最佳参数。测定DR片和FSR片光密度（OD）值。结果在本次研究的DR机上，对比度调节和亮度调节是控制DR图像亮度和灰度的重要参数，分别在115％～120％和160％～165％范围，组织对比度调至最大0．15，边缘最低1，降噪和组织均衡均为0的参数设置，可使DR胸片质量最优。DR胸片废片率（0．4％）明显低于FSR胸片（17％），差异有统计学意义（P〈0．05）。结论在GE公司DR机上经过适当的图像后处理，DR胸片可达到我国尘肺病诊断标准中对胸片质量的要求。Objective To＇establish the optimal image post-processing parameters for digital chest ra- diography as preliminary research for introducing digital radiography （DR） to pneumoconiosis diagnosis in China. Methods A total of 204 pneumoconiosis patients and 31 dust-exposed workers were enrolled as the subjects in this research. Film-screen radiography （FSR） and DR images were taken for all subjects. DR films were printed after raw images were processed and parameters were altered using DR workstation （GE Heahhcare, U.S.A.）. Image gradations, lung textures, and the imaging of thoracic vertebra were evaluated by pneumoconiosis experts, and the optimal post-processing parameters were selected. Optical density was measured for both DR films and FSR films. Results For the DR machine used in this research, the contrast adjustment （CA） and brightness adjustment （BA） were the main parameters that determine the brightness and gray levels of images. The optimal ranges for CA and BA were 115%-120% and 160%-165%, respectively. The quality of DR chest films would be optimized when tissue contrast was adjusted to a maximum of 0.15, edge to a minimum of 1, and both noise reduction and tissue equalization to 0. The failure rate of chest DR （0.4%） was significantly lower than that of chest FSR （17%） （P〈0.05）. Conclusion After appropriate image post-processing on DR machine purchased from GE Healthcare, the DR chest films can meet all requirements for the quality of chest X-ray films in the Chinese diagnostic eriteria for pneumoconiosis.

关 键 词：尘肺 放射摄影术 图像后处理 

分 类 号：R816.4[医药卫生—放射医学] TP391.41[医药卫生—临床医学]