Influence factors of fetal MRI imaging quality based on fast MRI sequences
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摘要:
目的探讨基于磁共振快速成像序列的胎儿图像质量的影响因素。 方法收集2017年1月~2018年1月在本院用产前超声筛选诊断或怀疑胎儿异常需要进行胎儿检查的中晚期妊娠孕妇50例。采用西门子1.5 T磁共振,对胎儿行快速多层多角度扫描技术,并对MRI图像进行质量评价,分析图像质量与孕周、胎位和羊水的关系,图像质量下降的原因。 结果选取的50例孕妇均能够成功完成检查,其中40例获得高对比度、高信噪比的图像,符合临床诊断要求。MRI成像质量与孕周、胎位和羊水量差异无统计学意义(P>0.05)。运动伪影、胎儿膀胱过度充盈、卷褶伪影可使图像质量降低。 结论在得出符合诊断要求MRI高质量图像的前提下,采用MRI快速扫描技术,其图像伪影少,信噪比和分辨率高,结果表明孕龄、胎儿位置和孕妇羊水量的差异与胎儿磁共振成像质量无关联性,表明高质量的磁共振快速成像技术在产前检查的重要性。 Abstract:ObjectiveTo explore the influence factors of fetal MRI imaging quality based on fast MRI sequences. MethodsFifty cases of fetus were collected during January 2017 to January 2018 in our hospital, who were undergone prenatal ultrasound screening or fetal abnormal suspected and needed further inspection in middle-late pregnancy pregnant women. The patients were scanned by SIEMENS 1.5 T magnetic resonance (NMR) with rapid multi-level multi-angle scanning technique. The MRI image quality was evaluated. The image quality was therefore analyzed to explore the connection with gestational age, position and amniotic fluid volume. The reason to the decline of the image quality were analyzed. ResultsAll the 50 pregnant women selected were able to undergo the examination successfully. Forty cases were able to obtain high contrast and high signal-to-noise ratio images, which met the clinical diagnostic requirements. There was no significant difference between the quality of MRI imaging and gestational age, fetal position or amniotic fluid volume (P>0.05). Motion artifacts, fetal bladder hyperplasia and pleated artifacts reduced the image quality. ConclusionIn the premise of high quality MRI images which meet the demand of diagnosis, rapid scanning technique can be applied. It has tiny image artifact, high signal to noise ratio and resolution. There is no relevance between the MRI quality and the gestational age, the fetal position or amniotic fluid volume. The high quality MRI imaging in prenatal examination is important. -
Key words:
- magnetic resonance imaging /
- fetus /
- image quality /
- scan sequence
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表 1 羊水量不同的图像质量的评价结果(n=50)
羊水量(标准) 优 良 差 总计 正常 24 6 2 32 过多 10 3 1 14 过少 1 3 0 4 Kruskal-Wallis Test,χ2=3.3195,P=0.1902. -
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