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首页> 外文期刊>IEEE Transactions on Electromagnetic Compatibility >A Study of the Interaction Between Implanted Pacemakers and the Radio-Frequency Field Produced by Magnetic Resonance Imaging Apparatus
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A Study of the Interaction Between Implanted Pacemakers and the Radio-Frequency Field Produced by Magnetic Resonance Imaging Apparatus

机译：植入式起搏器与磁共振成像设备产生的射频场之间相互作用的研究

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摘要

Specific absorption rate (SAR) and temperature increases produced inside a thorax model by an MRI apparatus equipped with a birdcage antenna operating at 64 MHz have been studied both experimentally and numerically. Considering a pacemaker (PM) equipped with a unipolar catheter inserted inside the thorax model, peak SARs averaged over 1 mg between 240 and 6400 W/kg, depending on the catheter section and length, on its position inside the phantom, and on field polarization have been obtained close to the catheter tip. On the other hand, the average SAR in the whole thorax is not influenced by the presence of the PM. Temperature increments from 0.6 $^{circ}$C to 15 $^{circ}$ C have been obtained for 6-min MRI investigations with the lowest values when the radio-frequency (RF) magnetic field is linearly polarized along a direction perpendicular to the implant plane.
机译：已经通过实验和数值研究了由配备有以64 MHz工作的鸟笼天线的MRI装置在胸腔模型内部产生的比吸收率（SAR）和温度升高。考虑到装有在胸腔模型内插入单极导管的起搏器（PM），峰值SAR平均在240至6400 W / kg之间超过1 mg，这取决于导管的截面和长度，其在体模内的位置以及场极化已在靠近导管尖端处获得。另一方面，整个胸部的平均SAR不受PM的影响。当射频（RF）磁场沿垂直方向线性极化时，对于6分钟MRI研究，温度从0.6°C到15°C的温度增量为最低值到植入物平面。

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