不同b值对晚孕期胎儿脑弥散加权图像信号强度及信噪比的影响

发布时间：2018-04-20 10:59

本文选题：胎儿脑 + 弥散加权成像　；参考：《实用医学杂志》2015年08期

【摘要】：目的:探讨不同b值对晚孕期胎儿脑扩散加权成像(DWI)图像信号强度及信噪比的影响。方法:正常晚孕期胎儿35例,使用4个不同b值(0、600、800、1 000 s/mm2)同时进行DWI成像扫描,得出小脑半球、丘脑、顶叶皮质及顶叶深部白质的信号强度(SI)、背景噪声标准差(SD),单因素方差分析不同b值时同一解剖部位参数的组间有无统计学意义。结果:所有感兴趣区SI、信噪比(SNR)在不同b值条件下差异具有统计学意义(P0.05),b=600 s/mm2时各感兴趣区SI、SNR最高,且随着b值增加,各感兴趣区SI、SNR均值呈下降趋势。亚组间两两比较时,各感兴趣区的SNR在b=600 s/mm2组与b=800 s/mm2组、b=600 s/mm2组与b=1 000 s/mm2组间差异均有统计学意义(P0.05),各感兴趣区的SNR在b=800 s/mm2组与b=1 000 s/mm2组间差异均无统计学意义(P0.05)。不同b值条件下背景噪声差异无统计学意义(P0.05)。结论:在1.5T MR设备上不同b值对晚孕期胎儿脑弥散加权图像信号强度及信噪比有影响,b值=600 s/mm2时,各感兴趣区信号强度及信噪比最高。
[Abstract]:Aim: to investigate the effects of different b values on the signal intensity and signal-to-noise ratio (SNR) of fetal brain diffusion weighted imaging (DWI) images during late pregnancy. Methods: 35 fetuses with normal late pregnancy were scanned by DWI imaging with 4 different b values of 0 600800 ~ 1 000 s / m ~ (2), and the cerebellar hemisphere and thalamus were obtained. Signal intensity of white matter in parietal cortex and deep parietal lobe, background noise standard deviation (SDN) and single factor variance analysis (ANOVA) were statistically significant at the same anatomical site. Results: the SNR of all regions of interest was the highest at 600 s/mm2 with different b values, and the average value of SIN SNR decreased with the increase of b value. The SNR of each region of interest was significantly different between BX 600 s/mm2 group and BX 800 s/mm2 group and BX 1 000 s/mm2 group when compared with each other (P 0.05). The SNR of each region of interest had no significant difference between BX 800 s/mm2 group and BX 1 000 s/mm2 group (P 0 05), but there was no significant difference between BX 600 s/mm2 group and BX 800 s/mm2 group (P < 0 05), and there was no significant difference (P 0 05) between BX 800 s/mm2 group and BX 1 000 s/mm2 group in SNR of different regions of interest (P < 0 05). There was no significant difference in background noise under different b values (P 0.05). Conclusion: different b values on 1.5T Mr equipment have influence on the signal intensity and signal-to-noise ratio (SNR) of brain diffusion-weighted images during late pregnancy. The signal intensity and signal-to-noise ratio (SNR) of each region of interest is the highest when the b value is 600 s/mm2.
【作者单位】：广东省深圳市妇幼保健院;
【分类号】：R714.5;R445.2

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