低剂量胸部DR的临床应用研究  

Clinical application of low dose chest DR

作　　者：张信起[1] 张寅丰 崔硕[1] 高艳辉 ZHANG Xin-qi;ZHANG Yin-feng;CUI Shou;GAO Yan-hui(Departmen of Medical Image,the Second Hospital of Hebei Medical University,Shijiazhuang050000,China;Department of Preventive Medicine,Hebei Institute ofRadiology,Shijiazhuang 050000,China)

机构地区：[1]河北医科大学第二医院医学影像科,河北石家庄050000 [2]河北省放射医学研究所防护科,河北石家庄050000

出　　处：《河北医科大学学报》2018年第11期1316-1320,共5页Journal of Hebei Medical University

基　　金：河北省科技计划项目(162777277)

摘　　要：目的探讨一种具有可操作性的胸部数字化X线摄影(digital radiography,DR)低剂量的检查方法。方法选取需行胸部DR检查的500例患者按其胸部厚度分为5组:A组(体厚H≤20cm)100例、B组(体厚H>20～22cm)110例、C组(体厚H>22～25cm)100例、D组(体厚H>25～27cm)90例、E组(体厚H>27cm)100例。A、B、C、D、E再随机分为:手控组A1组(50例)、B1组(55例)、C1组(50例)、D1组(45例)、E1组(50例);自控曝光组A2组(50例)、B2组(55例)、C2组(50例)、D2组(45例)、E2组(50例)。手控组曝光条件为A1组102kV/0.8mAs、B1组109kV/0.8mAs、C1组117kV/0.8mAs、D1组125kV/0.8mAs、E1组133kV/1mAs,自控组曝光条件均为125kV/0.7～3mAs,其余成像参数相同。辐射剂量由剂量计测量,对每例图像进行质量评分、噪声评价。对所有胸片右上肺野、膈下,空曝区行光密度测定。结果A1、B1、C1、D1、E1组平均辐射剂量明显低于A2、B2、C2、D2、E2组,差异有统计学意义(P<0.05)。A1组较A2组、B1组较B2组、C1组较C2组、D1组较D2组、E1组较E2组图像质量评分、噪声评价、胸片光密度差异均无统计学意义(P>0.05)。结论在胸部DR检查中,根据患者胸部厚度设置曝光条件、优化曝光参数后,患者接受的辐射剂量明显减低,但图像质量仍能保证,故此方法值得推广应用。Objective To explore an operable digital radiography（DR） low-dose examination method.Methods A total of 500 patients who underwent chest DR examination were enrolled. The patients were divided into 5 groups according to their chest thickness. Group A（body thickness H≤20 cm） 100 cases, group B（body thickness H〉20-22 cm）110 cases, group C（body thickness H〉22-25 cm ）100 cases, group D（body thickness H〉25-27 cm）90 cases, group E（body thickness H〉27 cm）100 cases. A, B, C, D and E were randomly divided into manual control group A1 group（50 cases）, B1 group（55 cases）, C1 group（50 cases）, D1 group（45 cases）, E1 group（50 cases）. Automatic exposure control（AEC） group A2 group（50 cases）, B2 group（55 cases）, C2 group（50 cases）, D2 group（45 cases）, E2 group（50 cases）. Manual control group exposure conditions are A1 group 102 kV/0.8 mAs, B1 group 109 kV/0.8 mAs, C1 group 117 kV/0.8 mAs, D1 group 125 kV/0.8 mAs, E1 group 133 kV/1 mAs, AEC group exposure conditions are 125 kV/0.7-3 mAs, other imaging parameters are the same. The radiation dose was measured by a dosimeter. Quality scoring and noise evaluation were performed for each image. For all chest radiographs, the right upper lung field, beneath edge of diaphragm, and background exposure area were measured for optical density.Results The average radiation dose of group A1, B1, C1, D1 and E1 was significantly lower than that of A2, B2, C2, D2 and E2 groups, and the difference was statistically significant（ P 〈 0.05）. There was no significant difference in the image quality score, noise evaluation, and chest X-ray density between the manual control group（A1, B1, C1, D1 and E1） and the AEC group（A2, B2, C2, D2 and E2）（ P 〉 0.05）.Conclusion In the chest DR examination, the radiation dose received by the patient is significantly reduced by setting the exposure conditions and optimizing the exposure parameters according to the patient′s chest thickness, and the image quality ca

关 键 词：放射摄影术 胸部 低剂量 

分 类 号：R814.3[医药卫生—影像医学与核医学]