中国医学创新Issue(4)：9-12,13,5.DOI:10.3969/j.issn.1674-4985.2016.04.003
颈动脉狭窄患者扩散加权成像的b值优化
Optimization of b-value in Cerebral Diffusion-Weighted 1.5T MR Imaging of Carotid Stenosis
摘要
Abstract
Objective: To optimize the b-value of cerebral diffusion-weighted MRI at 1.5T on DWI. Method: 27 patients were examined using EPI-DWI with different b values on a 1.5T MR scanner. The b-value of EPI-DWI was 0, 50, 100, 150, 200, 400, 600, 800, 1000, 1600, 2000, 2400, 3000 s/mm2, respectively. The SNR, CNR, SIR, and ADC value of periventricular anterior and the frontal lobe were measured. The correlation between the b-value and SNR, CNR, SIR, ADC was analyzed by Pearson correlation analysis. The differences were compared among the ADC value of the narrow side and the healthy side, periventricular anterior and the frontal lobe with Paired T test.Result: The SNR, CNR, SIR of DWI and ADC value of periventricular anterior decreased as the b-value increased, showed inverse correlations separately. The differences among the ADC value of the narrow side and the healthy side, periventricular anterior and the frontal lobe were significant.Conclusion: The selections of b values affected SNR, CNR, SIR and ADC values significantly. The optimized b-values of DWI for cerebral hypoperfusion at 1.5T is between 800 s/mm2 and 1000 s/mm2, when measuring stability of SNR, CNR, SIR and ADC value are better than others.关键词
动脉狭窄/扩散加权成像/磁共振成像Key words
Artery stenosis/Diffusion-weighted imaging/Magnetic resonance imaging引用本文复制引用
方慧,周勇,孟凡伟,姜洪雁,周慧,曲涛..颈动脉狭窄患者扩散加权成像的b值优化[J].中国医学创新,2016,(4):9-12,13,5.基金项目
大连市科技计划项目 （）
