MRI静磁场性伪影产生机理分析及解决措施探讨

Analysis and discussion on generating mechanism and solutions of MRI static magnetic field artifacts

目的:通过分析MRI静磁场性伪影的产生机理,探究应采取的相应措施,观察其效果如何。方法:利用SiemensImpact 1.0T和GE Signa 1.5T超导MR的SE、GRE等序列扫描患者或水模,根据静磁场性伪影的分类从改善内外环境、校正软硬件、修改参数或训练患者等方面采取各种解决措施。结果:静磁场性伪影得到不同程度的消除或减弱,图像质量改善明显。结论:通过相应解决措施可使多数静磁场性伪影减弱或完全消除,为临床提供更准确的信息。

Objcetive To observe the value of the corresponding solutions for MRI static magnetic field artifacts after analyzing their generating mechanism, Methods Different solutions was used to eliminate static magnetic field artifacts, such as improving inner and outer background, calibrating software and hardware, editing parameters, instructing patients, etc. in scanning patients or phantom with Siemens Impact 1.0T and GE Signa 1.5T MR by the use of SE or GRE sequences. Results Static magnetic field artifacts were controlled to different extent and the quality of the mass MR images were improved. Conclusion Most static magnetic field artifacts can be eliminated completely or reduced by using corresponding solutions, so more corrective information can be provided to clinic.