相位对比磁共振序列中的扰相梯度优化

发布时间：2018-06-07 14:50

  本文选题：磁共振 + 相位对比　； 参考：《浙江大学学报(工学版)》2015年05期

【摘要】：针对扰相梯度在基于梯度回波(GRE)的二维相位对比磁共振成像(2DPC-MRI)序列中的作用进行理论分析和实验研究.使用基于流动质子的二维相位对比磁共振成像仿真对扰相梯度的作用进行分析;在流动模体和志愿者实验中使用的扰相梯度为0π、2π、4π、6π、8π和10π,对成像结果进行测量,得到对应的流速.实验结果表明:当二维相位对比磁共振序列中的扰相梯度为0π和2π时,流动模体测量结果与设定值之间存在较大的误差,志愿者实验中扰相梯度为0π和2π的实验组与其他实验组的测量结果相比误差明显;当二维相位对比磁共振序列中扰相梯度大于等于4π时,各实验组之间的测量误差小于5%.从保证成像质量和减少成像时间两方面考虑,相位对比磁共振序列中最优的扰相梯度为4π.
[Abstract]:The effect of disturbing phase gradient on 2D phase contrast magnetic resonance imaging (2DPC-MRI) sequence based on gradient echo (GREE) is studied theoretically and experimentally. The effect of disturbing phase gradient is analyzed by using two-dimensional phase contrast magnetic resonance imaging simulation based on mobile proton, and the disturbing phase gradient used in flow mode and volunteer experiments is 0 蟺 ~ 2 蟺 ~ 2 蟺 ~ (4 蟺) ~ 4 蟺 ~ (4 蟺) ~ 6 蟺 ~ 6 蟺 ~ (8 蟺) and 10 蟺. The imaging results are measured and the corresponding flow velocity is obtained. The experimental results show that there is a large error between the measured results and the set values of the flow mode when the phase gradient in the two-dimensional phase contrast magnetic resonance sequence is 0 蟺 and 2 蟺. The experimental group with a phase gradient of 0 蟺 and 2 蟺 has a significant error compared with that of other experimental groups, and when the phase gradient is greater than or equal to 4 蟺 in the two dimensional phase contrast magnetic resonance sequence, the measurement error between the two groups is less than 5. In order to ensure the imaging quality and reduce the imaging time, the optimal phase gradient in phase contrast magnetic resonance sequence is 4 蟺.
【作者单位】： 东北大学中荷生物医学与信息工程学院;
【分类号】：O482.531
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本文编号：1991566