使用PRF相位差和基于几何模型的脂肪抑制方法的磁共振温度成像。
MR temperature imaging using PRF phase difference and a geometric model-based fat suppression method.
作者信息
Liu Shoubin, Zhou Yanming
出版信息
Technol Health Care. 2015;23 Suppl 2:S587-92. doi: 10.3233/THC-150997.
BACKGROUND
Because protons in fat do not exhibit a temperature-dependent frequency shift, proton resonance frequency shift (PRFS)-based MR thermometry always suffers from disturbances due to the presence of fats or lipids.
OBJECTIVE
A new fat suppression method for PRFS-based MR thermometry is proposed to obtain accurate variation of phase angle.
METHODS
Similar to the approach of separating fat and water with the two-point Dixon technique, we first scan a complex MR image for reference and then scan another complex image varying with temperature at the same TE point. Based on the conventional PRFS method, we use geometric relationships to remove the effect of fat on the variation of the phase angle.
RESULTS
Two phantoms with different water-to-fat ratios are involved in the temperature mapping test. Experimental results show that the temperature images of two phantoms are approximated under the same conditions.
CONCLUSIONS
The proposed fat suppression method is simple and effective for PRFS-based MR thermometry.
背景
由于脂肪中的质子不会表现出与温度相关的频率偏移，基于质子共振频率偏移（PRFS）的磁共振测温法总是会因脂肪或脂质的存在而受到干扰。
目的
提出一种用于基于PRFS的磁共振测温法的新型脂肪抑制方法，以获得准确的相角变化。
方法
类似于用两点 Dixon 技术分离脂肪和水的方法，我们首先扫描一幅复杂的磁共振图像作为参考，然后在相同的 TE 点扫描另一幅随温度变化的复杂图像。基于传统的 PRFS 方法，我们利用几何关系消除脂肪对相角变化的影响。
结果
温度映射测试涉及两个具有不同水脂比的体模。实验结果表明，在相同条件下，两个体模的温度图像相近。
结论
所提出的脂肪抑制方法对于基于 PRFS 的磁共振测温法简单且有效。
Zotero 插件