MR三维肺灌注成像对正常志愿者及慢性阻塞性肺疾病患者的对照研究  被引量:1

Comparative study of three dimensional dynamic contrast-enhanced MR perfusion imaging in healthy volunteers and patients with chronic obstructive pulmonary disease

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作  者:夏艺[1] 管宇[1] 范丽[1] 刘士远[1] 张铁峰 李兵[2] 于红[1] 

机构地区:[1]200003上海第二军医大学附属长征医院影像科 [2]200003上海第二军医大学附属长征医院呼吸科 [3]上海市宝山区大场医院呼吸科

出  处:《中华放射学杂志》2013年第7期629-633,共5页Chinese Journal of Radiology

基  金:国家自然基金青年基金资助项目(81000602);上海市自然基金资助项目(10zr1438900)

摘  要:目的探索性研究MR肺灌注成像早期发现轻度慢性阻塞性肺疾病(COPD)患者的局部肺灌注异常及对临床分级的能力,并与量化HRCT进行比较。方法62例COPD患者及17名健康志愿者于同一天内分别进行肺功能(PFT)、HRCT及MR肺灌注检查。根据慢性阻塞性肺疾病全球倡议(GOLD)分级,COPD患者分为I级19例、Ⅱ级17例、Ⅲ级14例及Ⅳ级12例。MR灌注图像经过后处理得到灌注缺损区的信号强度值(SIPD)、正性增强积分(PEI)、最大上升斜率(MSI)、最大下降斜率(MSD)、信号增强率(SER)及相对正常肺组织的信号强度(SInormal),计算得到灌注缺损区与相对正常肺组织的信号强度之比(RSI)。通过HRCT原始数据得到总肺体积(TLV),设定吸气末阈值〈-950HU为肺气肿区,得出总肺气肿体积(TEV),肺气肿指数(EI)为TEV与TLV的比值。正态分布数据以面±s表示,组间比较用单因素方差分析,两两组间比较采用Bonferroni法;非正态分布数据以中位数表示,多组间比较用Kruskal—Wallis检验,两两组间比较用Mann—WhitneyU检验法进行分析。结果健康志愿者与各级别COPD患者的MRI灌注参数(健康志愿者RIS、SIPD、PEI、MSI、MSD值分别为43.9±7.2、48.2±19.7、31.4、55.7、44.1;各级别COPD患者RSI、SIPD、PEI、MSI、MSD值分别为18.1±8.1、47.4±20.0、8.6、30.2、22.7,差异均有统计学意义(P值均〈0.01)。I与Ⅲ级、I与Ⅳ级及Ⅱ与Ⅳ级COPD患者之间的MRI灌注值RSI比较(I、Ⅱ、Ⅲ、Ⅳ级R。值分别为24.4±9.8、19.94-3.1、15.9±5.3、9.2±2.7),差异有统计学意义(t值为4.05~6.64,P值均〈0.01),但I与Ⅱ级、Ⅱ与Ⅲ级、Ⅲ与Ⅳ级间各参数值差异均无统计学意义(t值为2.00—4.46,P值均〉0.05)。HRCT容积参数值EI(对照组、I、Ⅱ、Ⅲ、Ⅳ级EI值中位数分别为1.2、3.8�Objective To prospectively compare MR pulmonary perfusion imaging with quantitative HRCT for the detection of mild chronic obstructive pulmonary disease (COPD) and classification of COPD. Methods Sixty-two consecutive patients with COPD and 17 healthy volunteers underwent pulmonary function test (PFT) ,HRCT and MR perfusion imaging on the same day. According to the Global Initiative for Chronic Obstructive Lung Disease ( GOLD ), all COPD patients were classified into 4 stages : stage I ( n = 19 ), stage II ( n = 17 ), stage m ( n = 14 ), stage IV ( n = 12 ). The signal intensity of perfusion defects (SIPD), signal intensity of normal lung perfusion (Snormal) on 3D MR perfusion were obtained through postprocessing and the signal intensity ratio ( RSI ) was calculated. The total lung volume (TLV) was calculated automatically on HRCT and the total emphysema volume (TEV) was obtained by applying - 950 HU thresholds. The TEV/TLV was deduced as emphysema index ( EI). Several comparisons were made between the volunteers and COPD patients by one-way ANOVA and Kruskal-Wallis test. Results The RSI,SIpD, PEI, MSI, MSD values of MRI perfusion in volunteers (43.9 ± 7.2,48.2 ± 19.7,31.4,55.7, 44. 1 ) were significantly different from those in patients with COPD ( 18.1 ± 8.1,47.4 ± 20. 0,8.6,30. 2, 22. 7 ) ( P 〈 0. 01 ). The RSI showed a significant difference between stage I ( 24. 4 ± 9.8 ) and stage m (15.9±5.3) or IV(9.2±2.7) and between stage II (19.9 ±3.1) and stage Iv(t =4.05-6.64,P〈 0. 01). However, all MRI perfusion parameters between stage I and stage II, stage II and stage III, stage III and stage IV were no differences ( t = 2. 00-4.46, P 〉 0.05 ). The median of EI in volunteers and stage I --IV COPD patients were 1.2,3.8,8.0, 13.7,18.3, and the quartile range were 3.7,7.1,9. 2, 10. 5,7.7 ,respectively. The EI in volunteers showed significant differences with that of stage II-IV COPD and the EI of stage IV was diff

关 键 词:肺疾病 慢性阻塞性 呼吸功能试验 磁共振成像 体层摄影术 x线计算机 

分 类 号:R445.2[医药卫生—影像医学与核医学] R563.9[医药卫生—诊断学]

 

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