放射学实践
放射學實踐
방사학실천
RADIOLOGIC PRACTICE
2015年
8期
835-837
,共3页
邵华飞%刘剑芳%姚丽波%刘戬%屈东%王铸
邵華飛%劉劍芳%姚麗波%劉戩%屈東%王鑄
소화비%류검방%요려파%류전%굴동%왕주
体层摄影术,X线计算机%Bayes判别分析%食管癌%淋巴结转移
體層攝影術,X線計算機%Bayes判彆分析%食管癌%淋巴結轉移
체층섭영술,X선계산궤%Bayes판별분석%식관암%림파결전이
Tomography,X-ray computed%Bayes discriminatory%Esophageal cancer%Lymph node metastasis
目的:利用Bayes判别分析初步建立诊断食管癌淋巴结转移的各种CT征象的联合诊断模型。方法:共搜集胸段食管癌208例,将其分为实验组即训练样本(166例,80%)及检验组即验证样本(42例,20%),实验组用以建立诊断方程,检验组用以验证方程。结果:经计算获得的方程为:Y0=-7.499X1+7.957X2+167.761X3-0.087X4+0.459X5-5.528X6-0.711X7-66.080,Y1=-6.697X1+8.231X2+181.686X3-0.106X4+2.219X5-3.331X6-0.124X7-83.183,其中Y0为非转移组,Y1为转移组,X1为淋巴结最大短径,X2为淋巴结最大长径,X3为横纵比,X4为最大截面积,X5为是否边缘模糊,X6为是否中央低密度,X7为是否成簇分布。利用自身检验法所得诊断模型的符合率为87.7%,误判率为12.3%,交叉检验法与自身检验法所得结果相近。当利用验证样本数据代入方程,所得模型诊断符合率为84.7%,误判率为15.3%。结论:通过Bayes判别分析法所建立的不同CT征象对食管癌淋巴结转移的联合诊断模型具有一定的诊断价值,但诊断模型还有待进一步完善。
目的:利用Bayes判彆分析初步建立診斷食管癌淋巴結轉移的各種CT徵象的聯閤診斷模型。方法:共搜集胸段食管癌208例,將其分為實驗組即訓練樣本(166例,80%)及檢驗組即驗證樣本(42例,20%),實驗組用以建立診斷方程,檢驗組用以驗證方程。結果:經計算穫得的方程為:Y0=-7.499X1+7.957X2+167.761X3-0.087X4+0.459X5-5.528X6-0.711X7-66.080,Y1=-6.697X1+8.231X2+181.686X3-0.106X4+2.219X5-3.331X6-0.124X7-83.183,其中Y0為非轉移組,Y1為轉移組,X1為淋巴結最大短徑,X2為淋巴結最大長徑,X3為橫縱比,X4為最大截麵積,X5為是否邊緣模糊,X6為是否中央低密度,X7為是否成簇分佈。利用自身檢驗法所得診斷模型的符閤率為87.7%,誤判率為12.3%,交扠檢驗法與自身檢驗法所得結果相近。噹利用驗證樣本數據代入方程,所得模型診斷符閤率為84.7%,誤判率為15.3%。結論:通過Bayes判彆分析法所建立的不同CT徵象對食管癌淋巴結轉移的聯閤診斷模型具有一定的診斷價值,但診斷模型還有待進一步完善。
목적:이용Bayes판별분석초보건립진단식관암림파결전이적각충CT정상적연합진단모형。방법:공수집흉단식관암208례,장기분위실험조즉훈련양본(166례,80%)급검험조즉험증양본(42례,20%),실험조용이건립진단방정,검험조용이험증방정。결과:경계산획득적방정위:Y0=-7.499X1+7.957X2+167.761X3-0.087X4+0.459X5-5.528X6-0.711X7-66.080,Y1=-6.697X1+8.231X2+181.686X3-0.106X4+2.219X5-3.331X6-0.124X7-83.183,기중Y0위비전이조,Y1위전이조,X1위림파결최대단경,X2위림파결최대장경,X3위횡종비,X4위최대절면적,X5위시부변연모호,X6위시부중앙저밀도,X7위시부성족분포。이용자신검험법소득진단모형적부합솔위87.7%,오판솔위12.3%,교차검험법여자신검험법소득결과상근。당이용험증양본수거대입방정,소득모형진단부합솔위84.7%,오판솔위15.3%。결론:통과Bayes판별분석법소건립적불동CT정상대식관암림파결전이적연합진단모형구유일정적진단개치,단진단모형환유대진일보완선。
Objective:To construct mechanism model for the diagnosis of LNs (Lymph nodes metastasis)of esophageal cancer by Bayes discriminatory analysis.Methods:208 thoracic esophageal cancer cases were divided into two groups,inclu-ding training set (166 cases)and test set (42 cases).Training set was used to construct mechanism model,test set was used to analyze its value of diagnosis.Results:Non-metastatic LNs:Y0 = -7.499X1 +7.957X2 +167.761X3 -0.087X4 +0.459X5-5.528X6-0.711X7-66.080;metastatic LNs:Y1= -6.697X1+8.231X2+181.686X3-0.106X4+2.219X5-3.331X6-0.124X7-83.183.X1= short-axis diameter,X2= long-axis diameter,X3= aspect ratio,X4= cross-sectional area, X5= fuzzy rim,X6= cental low density area,X7= clustered distribution.The accuracy was 87.7%,the P (the probability of false prediction)was 12.3%,with similar result by cross validation.For the test set,the accuracy of Bayesian analysis was 84.7%,the P was 15.3%.Conclusion:It is feasible to use Bayes discriminatory analysis for diagnosis of LNs metastasis of esophageal cancer.