脑区功能性MRI成像参数的选择对图像质量影响的研究

Research on the influence of functional magnetic resonance imaging parameter to the quality of image in brain area

目的:探讨脑区功能性MRI成像参数的选择对图像质量的影响。方法:2012年2-12月期间对9名青年志愿者进行脑区功能性MRI扫描,分析其成像参数对影像质量的影响。结果:通过logistic回归分析,b值越低1级图像越多、3级图像越少;弥散敏感梯度方向数越多1级图像越多、3级图像越少;层厚和(或)层间距越大1级图像越多、3级图像越少。对图像质量影响最大的是层厚和(或)层间距、弥散敏感梯度方向数和b值。结论:脑区功能性MRI图像质量的影响因素包括层厚和(或)层间距、弥散敏感梯度方向数和b值,在参数选择过程中需从诊断目的出发,权衡利弊,综合考虑。

Objective： To discuss the effect of the choice of brain functional MRI parameter on image quality. Methods： To select nine young volunteers for scanning brain functional MRI from February to December, 2012, and analyze the effect caused by parameters to the image quality. Results： The lower of the b value, the more level 1 image, the less level 3 image; the more of the number of diffusion sensitive gradient direction, the more level 1 image, the less level 5 image. The 1 .argest impact on image quality is the interlayer spacing, the number of diffusion sensitive gradient direction and the b value. Conclusion： The factors influencing the quality of brain functional MRI images including the interlayer spacing, the number of diffusion sensitive gradient direction and b value. In the parameter selection process, one should start from diagnostic purposes and weigh the pros and cons with overall consideration.