摘要
目的应朋64层螺旋cT双相扫描三维定量分析慢性阻塞性肺疾病(COPD)患者CT定量肺功能与常规肺功能(PFT)之间的关系,并评估CT定量分析肺功能在COPD患者中的应用价值。方法收集84例COPD患者,采用64层螺旋CT扫描机,于深吸气末和深呼气末分别对患者行全肺扫描。采用全自动后处理软件,三维定量分析CT肺气肿参数和空气潴留评估参数。应用Spearman相关系数和多元线性回归分析CT肺功能参数与PFT之间的关系。结果cT肺气肿评估参数最低1%衰减值[Perc1,(-984.28±17.93)HU]、最低15%衰减值[Perc15,(-948.35±22.26)HU]与用力呼气容积实测值与预计值百分比(FEV,%,48.69±23,47),第1秒用力呼气容积与用力肺活量比[FEV,/FVC,(45.89±15.36)%]呈正相关(r=0.45~0.67,P〈0.01),与残气比[RV/TLC,(61.32±14.48)%]呈负相关(r=-0.33~-0.42,P〈0.01)。CT评估肺气肿指数(EI)和空气潴留评估参数:-860~-950HU范围内呼气相、吸气相衰减区占全肺容积百分比的差值[RVC-860~-950,(17.66±22.36)%]、呼气相与吸气相CT平均肺密度比值(MLDex/in,0.93±0.06)、呼气相与吸气相CT全肺容积比(LVex/in,0.71±0.14)与FEV,%、FEV1/FVC呈负相关(r=-0.48~-0.69,P〈0.01);CT评估肺气肿参数[EI,(18.43±13.60)%]和空气潴留评估参数(RVC-860~-950、MLDex/in、LVex/in)与RV/TLC呈正相关(r=0.41~0.66,P〈0.01)。随后一元线性回归分析表明,CT肺气肿评估参数(EI、Perc1、Perc15)和CT空气潴留评估参数(RVC-860~-950、MLDex/in、LVex/in)的变化与常规PFT参数间具有关联性(R^2值0.27~0.66,P〈0.01);进一步将CT肺气肿与空气潴留参数两两结合成CT肺功能模型,进行多元线性回归分析(R^2=0.66~0.85,P〈0.01),较单独分析时明显提高。结论COPD患者CT肺气肿和空气潴留参数二者分别与PFT具有线性相关性,能够有效反映患者肺功能变化。CT肺气肿参数和空气潴留参数组成相关模型联合分析,与PFT相关性更好,更精确地反映了COPD患者肺功能的变化。
Objective To investigate the correlation between the paired inspiratory and expiratory quantitative CT and pulmonary function tests (PFTs) in patients with chronic obstructive pulmonary disease (COPD). Methods A total of 84 patients with COPD were enrolled. For each patient, CT scan was performed in deep inspiration and expiration. Using automatic post-processing software, a three-dimension quantitative measurement was employed to assess the CT parameters of emphysema and air trapping. The correlation between CT and PFT was evaluated by the Spearman rank correlation test and multivariate linear regression analysis. Results The percent 1 [Perc1 , ( - 984. 28 ± 17.93 ) HU ] and percent 15 [ Pete,5, ( - 948.35 ± 22.26 ) HU ] from the CT parameters of emphysema were positively correlated with the forcedexpiratory volume in 1 second predicted ( FEV1% ,48.69 ± 23,47 ) , the ratio of forced expiratory volume in 1 second over forced vital capacity [ FEVI/FVC, (45.89 ± 15.36 ) % , r = 0.45-0. 67, P 〈 0. 01 ] , wasnegatively correlated with the ratio of residual volume to total lung capacity [ RV/TLC, (61.32 ± 14.48) % 1. The other CT parameters of emphysema index (EI) and the parameters of air trapping, thechange in relative lung volume with attenuation values from - 860 to - 950 HU [ RVC -860--950, ( 17.66 ± 22. 36) % I ,the expiration to inspiration ratio of mean lung density ( MLD ex/in,, ,0. 93 ± 0. 06), the expirationto inspiration ratio of lung volume (LVex/in, 0. 71 ± 0. 14 ) had negative correlations with logFEV1 %, FEVI / FVC (r = - 0.48- - 0. 69, P 〈 0.01 ) and positive correlations with RV/TLC ( r = 0. 41-0. 66, P 〈0. 01 ). The further univariate linear regressions showed that EI, Perc1, Perc15, RVC -860--950, MLDex/in,, LVex/in, were correlated with the parameters of PFTs (R square values of the regression equation, ranged from0. 27 to 0. 66 ,P 〈 0. 01 ), After the pairwise combinations of the parameters of emphysema and air trapping, multivariate stepwise regressions showed better R square values from 0. 66 to 0. 85. Conclusions CTparameters of emphysema and air trapping can reflect pulmonary function in COPD patients, The combinations of the two types of CT parameters are more correlated with the PFTs parameters.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2013年第5期405-409,共5页
Chinese Journal of Radiology
关键词
肺疾病
阻塞性
呼吸功能试验
体层摄影术
X线计算机
Lung diseases, obstructive
Respiratory function tests
Tomography, X-ray computed