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评估网对扩散权重成像的射频屏蔽效应:对两次重定焦的自旋回声和Stejskal-Tanner序列进行比较研究

Eizaburo Imamura¹, Wataru Jomoto², Yasuo Takatsu³

¹Department of Radiological Technology, Hyogo Medical University Hospital, 1-1 Mukogawa-cho, Nishinomiya, Hyogo, 663-8501, Japan.

Physical and engineering sciences in medicine

|May 21, 2024

概括

斯泰斯卡尔-坦纳序列 (ST) 在磁共振成像过程中显示了网的较低的射频屏蔽效应,与两次重新聚焦的自旋回声序列 (TRSE) 相比. 这会影响图像质量和明显扩散系数的测量.

科学领域:

医疗成像医学成像
放射学放射学是一门学科.
生物医学工程生物医学工程

背景情况:

头骨整形经常涉及网,这可能导致MRI中的射频 (RF) 屏蔽工件.
人造物可以降低图像质量,并影响诸如表面扩散系数 (ADC) 等定量测量.

研究的目的:

为了比较两次重新聚焦的自旋回声序列 (TRSE) 和Stejskal-Tanner序列 (ST) 的性能,用于MR扩散权重成像.
用这些序列来评估网RF屏蔽对图像质量和ADC值的影响.

主要方法:

使用了一台1.5TMRI扫描仪和一个模拟大脑的幻影.
用网和没有网进行成像,使用TRSE和ST序列.
图像质量使用正常化绝对平均偏差 (NAAD) 和Dice相似系数 (DSC),以及ADC值计算来评估.

主要成果:

与ST相比,TRSE在网格以下显示了显著更高的NAAD值,ADC下降率更高 (14.1%与9.8%相比).
对TRSE而言,DSC值明显低于ST值.
没有网格的TRSE的ADC值较高,但与现有的网格没有显著差异.

结论:

与TRSE相比,Stejskal-Tanner序列的网的射频屏蔽效果较小.
由于文物较少,ST可能更适合在植入体的头骨整形患者中进行扩散权重MR成像.

关键词:

扩散权重成像技术的使用.磁共振成像技术磁共振成像技术无线电频率屏蔽效应的作用斯泰斯卡尔的纳.网是一种网.两次重新聚焦的旋转回声.

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