Yan Liu, Jianxiang Shen, W. Kainz, Songsong Qian, Wen Wu, Ji Chen
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引用次数: 12
Abstract
Heating effect by external fixation devices under MRI RF field was studied numerically for both 1.5-T and 3-T MRI systems. It is found that changing insertion depth and pin spacing could largely affect the surface heating level. In 1.5-T MRI, smaller insertion depth and larger pin spacing will produce larger temperature rise. However, for 3T system, the relation is not very clear when insertion depth became larger than 5cm or when pin spacing became larger than 20cm. Effect of connection bar material on external fixator is also studied and the heating mechanism of the device is analysed.
对1.5-T和3-T MRI系统外固定装置在MRI射频场下的加热效应进行了数值研究。研究发现,插针深度和插针间距的变化对表面加热水平有很大影响。在1.5 t MRI中,较小的插入深度和较大的引脚间距会产生较大的温升。而对于3T体系,当插入深度大于5cm或引脚间距大于20cm时,这种关系就不太清楚了。研究了连接杆材料对外固定架的影响,并分析了该装置的加热机理。