Reducing MRI RF-induced heating for the external fixation using capacitive structures
Reducing MRI RF-induced heating for the external fixation using capacitive structures
复制标题
使用电容结构减少 MRI 射频引起的外部固定发热
DOI：
10.1088/1361-6560/ab9706
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发表时间：
2020
影响因子：
3.5
通讯作者：
Chen, Ji
中科院分区：
文献类型：
--
作者：
Zheng, Jianfeng;Yang, Rui;Wang, Qingyan;Guo, Ran;Xu, Jian;Shou, Xingxian;Kainz, Wolfgang;Chen, Ji
本文介绍了一种在磁共振成像（MRI）过程中减少外固定器械射频（RF）致热的通用方法。开发了一个简化的等效电路模型，以说明外固定器械与MRI射频场之间的相互作用。将精心设计的机械结构（利用电路模型中的容抗）应用于外固定器械，以缓解外固定器械与MRI射频场之间的耦合，从而减少射频致热。数值和实验研究证明了电路模型的正确性和所提出方法的有效性。通过在夹销和杆-夹接头中添加电容结构，数值模拟显示，在1.5 T下，销尖端附近平均1克（SAR 1g）的峰值比吸收率从760.4 W kg− 1降至12.0 W kg− 1，在3 T下从391.5 W kg− 1降至25.2 W kg− 1。实验结果表明，在1.5 T和3 T下，本文研究的外固定装置的射频感应加热从7.85 C降低到1.01 C和从16.70 C降低到0.32 C。精心设计的电容结构可用于失谐外固定器械和MRI场之间的耦合，以减少1.5 T和3 T MRI系统中人体内的RF感应加热。然而，由于射频致热是非常特定的器械和设计，因此必须根据其最终设计对所有器械进行彻底测试。
This paper presents a generic method to reduce the radiofrequency (RF) induced heating of external fixation devices during the magnetic resonance imaging (MRI) procedure. A simplified equivalent circuit model was developed to illustrate the interaction between the external fixation device and the MRI RF field. Carefully designed mechanical structures, which utilize capacitive reactance from the circuit model, were applied to the external fixation device to mitigate the coupling between the external fixation device and the MRI RF field for RF-induced heating reduction. Both numerical and experimental studies were performed to demonstrate the validity of the circuit model and the effectiveness of the proposed method. By adding capacitive structures in both the clamp-pin and rod-clamp joints, the peak specific absorption rate averaged in 1 gram (SAR 1g) near the pin tips were reduced from 760.4 W kg− 1 to 12.0 W kg− 1 at 1.5 T and 391.5 W kg− 1 to 25.2 W kg− 1 at 3 T from numerical simulations. Experimental results showed that RF-induced heating was reduced from 7.85 C to 1.01 C at 1.5 T and from 16.70 C to 0.32 C at 3 T for the external fixation device studied here. The carefully designed capacitive structures can be used to detune the coupling between the external fixation device and the MRI fields to reduce the RF-induced heating in the human body for both 1.5 T and 3 T MRI systems. However, as RF-induced heating is very device and design specific all devices must be thoroughly tested based on its final design.
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