多层螺旋CT低剂量双相扫描像素指数对慢性阻塞性肺病肺功能的评价研究  被引量:25

Assessment of pulmonary function using pixel indexes of multiple-slice spiral CT low-dose two-phase scanning in chronic obstructive pulmonary disease

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作  者:张利华[1] 王云华[1] 蒋中标[1] 张乐君[1] 孙万里[2] 张春明[2] 

机构地区:[1]中南大学湘雅二医院放射科,长沙410011 [2]长治医学院附属和平医院影像科

出  处:《中华放射学杂志》2012年第9期784-788,共5页Chinese Journal of Radiology

基  金:湖南省社会发展科技支撑计划重点项目《MSCT肺功能诊断的技术规范及对COPD早期诊断及分级诊断标准的研究》资助(2012sk2014)

摘  要:目的探讨64层CT低剂量双相扫描像素指数(PI)在慢性阻塞性肺病(COPD)患者肺功能(PFT)评估中的应用价值。方法选择经临床PFT检查确诊的COPD患者36例及健康对照组30名,2组对象均采用64层CT机进行深吸气末、深呼气末的全肺低剂量(50mAs)及常规剂量(100mAs)吸气末扫描。所有扫描结束后,由CT机自动计算出每次扫描的容积CT剂量指数(CTDIvol)和剂量长度乘积(DLP),并换算出有效剂量(ED)。按CT扫描层数将全肺分为上、中、下3个肺区,全肺的P1分为-960~-1024、-910~-960、-80~-0910、-700~-800、-400~-700HU,5个阈值区域。应用Pulmo软件分别测量和计算出COPD组与健康对照组的低剂量扫描数据:(1)各阈值区域的深吸气末PI(PIin)、深呼气末PI(PIex)。(2)双相扫描上、中、下肺区及全肺〈一910HU的PI各指标:PIin-910、PIex-910、PIin-910-PIex-910、PIex.910/PIin-910、(PIin-910—PIex-910)/PIin-910所有检查者均在CT检查前后3d内完成PFT检查,对照研究指标为第1秒用力肺活量(FEVl)的实测值与预计值的比值(FEVl%)及FEVl与用力肺活量(FVC)的比值(FEVl/FVC)。应用Mann—whitneyU检验及Spearman相关分析法进行数据统计。结果应用50mAs扫描对COPD患者行PFT研究,比常规剂量100mAs降低了50%的辐射剂量。COPD组与正常组比较,PIin在-960~-1024、~-910~960、-800~-9103个分区差异有统计学意义(U值分别为0.00、57.00、20.50,P值均〈0.01),PIex在各分区差异亦有统计学意义(U值分别为0.00、0.00、71.52、191.00、6.00,P值均〈0.01);PI-910一Ⅷ24双相扫描值与FEVl%、FEVl/FVC均有相关性(r值分别为-0.548、-0.664,-0.752、-0.781,P值均〈0.01);PIin-910、PIex-910、PIex-910/PIin_910及(Plin-910-PIex_910)/PIin_910指标均与FEV1%、FEV1/FVC有良好的相关性(r值分别为-0�Objective To explore the values of pixel indexes (PI) with multiple-slice spiral CT low-dose two-phase scanning for assessing the pulmonary function in chronic obstructive pulmonary disease (COPD). Methods Thirty-six patients with COPD( COPD group)and 30 healthy people (control group) underwent pulmonary function test (PFT). Chest 64-MSCT low-dose (50 mAs) scanning at full inspiration and expiration, routine scanning (100 mAs) at inspiration were performed. The effective dose (ED) was calculated. The lung was divided into three regions ( upper, middle, lower). PI of lung were divided into five groups : - 960 -- - 1024, - 910 -- - 960, - 800 -- - 910, - 700 -- - 800, - 400 -- - 700. The PI_910 (sum of the PI under -910 HU) of low-dose scanning at each region were measured and calculated using pulmo software. All PI included Plin_910, Plex_910, Plin_910-Plex_910, Plex_910/Plin_910 and (Plin_910-Plex_910)/Plin_910. All patients underwent PFT within 3 days after 64-MSCT canning, FEVI% and FEV1/FVC were selected for comparison. Results The Plin in three regions ( - 960 -- - 1024, -910 -- -960, -800 -- -910) were statistically significant between normal and COPD groups( U =0. 00, 57.00,20. 50,P 〈 0. 01 ). The Plex in all regions were statistically significant ( U = 0. 00,0. 00,71.52, 191.00,6.00,P 〈 0.01 ). PI_910__1024 at expiration and inspiration were correlated with FEVI% and FEV1/FVC( r = - 0. 548, - 0. 664, - 0. 752, - 0. 781, P 〈 0. 01 ). Plin -910, Plex -910, Plex _910/Plin -910, ( Plin -910 -Plex -910 )/Plin -91o had a good correlation with FEV1% and FEV1/FVC ( r = - 0. 548, - 0. 664, - 0. 752, - 0. 781, - 0. 674, - 0. 642,0. 674,0. 642, P 〈 0. 01 ). Conclusion Pixel indexes of 64-MSCT low-dose two-phase scanning can be used to evaluate pulmonary function in COPD patients.

关 键 词:肺疾病 慢性阻塞性 呼吸功能实验 体层摄影术 螺旋计算机 

分 类 号:R563.9[医药卫生—呼吸系统]

 

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