目的研究不同时间点猴脑缺血半暗带(IP)面积的演变规律。方法成年猴7只,采用自体血栓介入法制作猴大脑中动脉闭塞模型。于导丝到位后1、5、10、15、20、24h分别行CT灌注成像、DWI、PWI和T2WI。取4点ROI,1点为中心区,3点为边缘区,2点为1、3点的中点,4点为邻近的正常信号区。测量脑血流量(CBF)、脑血容量(CBV)、平均通过时间(MTT)、ADC和负性强化积分(NEI),计算时采用与正常对侧的比值(rCBF、rCBV、rMTT、rADC、rNEI)。采用PWI(MTT)-DWI和计算机图像处理软件结合IP阈值两种方法计算IP面积。采用单因素方差分析计算不同时间点缺血灶内不同部位的差异,采用ROC曲线分析不同影像参数的IP阈值及其敏感度和特异度。结果7只猴中5只造模成功。1、2、3点间20h内rCBF、20h内rNEI、15h内rCBV、10h内rADC、24h时rMTT差异有统计学意义(P〈0.05)。1、2、3点ROI值分别为:rCBF:1h(0.160±0.034、0.310±0.037、0.540±0.107),5h(0.098±0.029、0.157±0.052、0.427±0.116),10h(0.072±0.023、0.097±0.028、0.209±0.070),15h(0.054±0.017、0.069±0.015、0.166±0.049),20h(0.038±0.011、0.026±0.007、0.092±0.013);rNEI:1h(0.219±0.085、0.303±0.099、0.463±0.132),5h(0.143±0.057、0.195±0.055、0.348±0.127),10h(0.127±0.029、0.171±0.058、0.259±0.079),15h(0.128±0.024、0.164±0.031、0.217±0.030),20h(0.075±0.019、0.147±0.058、0.129±0.045);rCBV:1h(0.594±0.199、0.804±0.099、1.021±0.169),5h(0.457±0.103、0.462±0.145、0.815±0.201),10h(0.222±0.046、0.249±0.065、0.529±0.135),15h(0.201±0.047、0.187±0.055、0.361±0.083);rADC:1h(0.515±0.115、0.667±0.097、0.761±0.106),5h(0.488±0.100、
Objective To investigate the evolution of monkey brain ischemic penumbra(IP) area. Methods Seven monkeys were used to make middle cerebral artery occlusion (MCAO) model by interventional methods. CT perfusion imaging, MR diffusion weighted-imaging ( DWI), perfusion weightedimaging(PWI) and T2WI were performed at 1, 5, 10, 15, 20 and 24 h after MCAO respectively. Four regions of interest of infarct lesion were measured. Point 1 was atthe infarct core, point 3 was at the infarct margin, and point 2 was at the midpoint between point 1 and 3. Point 4 demonstrated normal signal intensity adjacent to high signal intensity. Parameters measured included cerebral blood flow (CBF), cerebral blood volume (CBV), mean transit time (MTT), apparent diffusion coefficient (ADC) and negative enhancement integral (NEI). The relative ratios between infarct lesions and the corresponding contralateral normal brain were calculated(rCBF, rCBV, rMTT, rADC and rNEI). The IP areas were calculated by two methods: IP thresholds combined with self-made computer software, and PWI( MTT)-DWI mismatch. ANOVA and ROC analysis were used. Results Five of 7 monkey MCAO models were made successfully. There were significantly difference of rCBF and rNEI within 20 h, of rCBV within 15 h, of rADC within 10 h, of rMTT at24 h (P〈0.05). ROI 1,2 and 3 values as following:rCBF: 1 h(0. 160 ±0.034, 0.310 ±0.037, 0. 540 ±0. 107), 5 h(0. 098 ±0. 029, 0. 157 ±0. 052, 0. 427 ±0. 116), 10 h(0. 072 ±0. 023, 0. 097 ± 0.028, 0.209 ±0.070), 15 h(0.054 ±0.017, 0.069 ±0.015, 0. 166 ±0.049), 20 h(0.038±0.011, 0.026±0.007, 0.092±0.013); rNEI: 1 h(0.219 ±0.085, 0.303±0.099, 0.463±0.132), 5 h (0.143±0.057, 0.195 ±0.055, 0.348 ±0.127), 10 h(0. 127 ±0.029, 0.171 ±0.058, 0.259 ± 0.079), 15 h(0. 128±0.024, 0. 164 ±0. 031, 0.217 ±0. 030), 20 h(0. 075 ±0.019, 0. 147 ±0. 058, 0. 129±0.045); rCBV: 1 h(0.594 ±0. 199, 0.804 ±0.099, 1.021 ±0. 169), 5 h