摘要
目的:探讨胼胝体磁共振弥散张量成像(DTI)临床应用的扫描参数。方法:对30名健康成年人行头部矢状位DTI,比较不同b值、层厚/层间距、扩散敏感梯度方向3个扫描参数对各向异性分数(FA)图像质量的影响。结果:不同的扫描参数对FA图像质量的影响各不相同。中间位b值(b=1 000 s/mm2)时FA图像质量最佳,高b值(b=1 500 s/mm2)FA图像噪声大,低b值(b=500 s/mm2)FA图像对比度差。层厚/层间距越大,FA图像信噪比越高,但会遗漏细微结构的显示。13个与25个扩散敏感梯度方向FA图像质量差异无统计学意义(P>0.05),6个扩散敏感梯度方向FA图像质量较差。结论:临床实际应用中,胼胝体矢状位DTI的适用扫描参数为b=1 000 s/mm2、5 mm/0 mm层厚/层间距、13个扩散敏感梯度方向。
Objective:To explore the technical parameters of magnetic resonance diffusion tensor imaging(DTI) in corpus callosum. Methods:The DTI of the sagittal plane were detected in 30 nomarl brains. The effects of b value, slice thickness/interlamellar spacing and diffusion sensitive gradient direction on fractional anisotropy(FA) image quality were compared. Results:Different parameters had different effects on FA image quality. The quality of FA image was best when b value was middle( b = 1 000 s/mm2) ,FA image noise was large at the high b value(b = 1 500 s/mm^2 ) ,and the contrast of FA image was poor at the low b value(b =500 s/mm2 ). The signal to noise ratio was high with slice thickness/interlamellar spacing increasing, the subtle structure was easy to miss. The differences of FA image qualities at 13 and 25 diffusion sensitive gradient directions statistical significance ( P 〉 0.05 ). The FA image quality at 6 diffusion sensitive gradient direction was worse hadno. Conclusions:The 1 000 s/mm2 of b value,5 mm/0 mm of slice thickness and 15 diffusion sensitive gradient directions are suitable for DTI of corpus callosum in the sagittal head in clinic.
出处
《蚌埠医学院学报》
CAS
2014年第1期34-37,共4页
Journal of Bengbu Medical College
关键词
脑
胼胝体
弥散张量成像
磁共振成像
技术参数
brain
corpus callosum
diffusion tensor imaging
magnetic resonance imaging
technical parameter