Asymmetric spin-echo imaging of magnetically inhomogeneous systems: Theory, experiment, and numerical studies
Asymmetric spin-echo imaging of magnetically inhomogeneous systems: Theory, experiment, and numerical studies
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DOI：
10.1002/mrm.1910400314
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发表时间：
1998-09-01
影响因子：
3.3
通讯作者：
Gore, JC
中科院分区：
文献类型：
--
作者：
Stables, LA;Kennan, RP;Gore, JC
研究了非对称自旋回波（ASE）脉冲序列在含磁不均匀性成像介质中提供不同程度的自旋回波（SE）型和梯度回波（GE）型对比的能力。利用理论、计算机模拟和实验研究了ASE信号与磁场扰动大小的关系。利用Anderson-Weiss平均场理论得到了ASE信号的理论预测，其结果得到了计算机模拟和实验研究的定性支持。结果表明，ASE序列可用于调整对磁化率对比效应贡献最大的扰动器尺寸范围。
The ability of the asymmetric spin-echo (ASE) pulse sequence to provide different degrees of spin-echo (SE)-type and gradient-echo (GE)-type contrast when imaging media containing magnetic inhomogeneities is investigated. The dependence of the ASE signer on the size of magnetic field perturbers is examined using theory, computer simulations, and experiment. A theoretical prediction of the ASE signal is obtained using the Anderson-Weiss mean field theory, the results of which are qualitatively supported by computer simulations and experimental studies. it is shown that the ASE sequence can be used to tune the range of perturber sizes that provide the largest contributions to susceptibility contrast effects.