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首页> 外文期刊>Magnetic resonance in medicine: official journal of the Society of Magnetic Resonance in Medicine >A numerical investigation on the effect of RF RF coil feed variability on global and local electromagnetic field exposure in human body models at 64 MH MH z
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A numerical investigation on the effect of RF RF coil feed variability on global and local electromagnetic field exposure in human body models at 64 MH MH z

机译：64 MH MH Z在人体模型中全球和局部电磁场暴露对LF射频线圈馈送变异性的数值研究

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Purpose This study aims to investigate how the positions of the feeding sources of the transmit radiofrequency (RF) coil, field orientation direction with respect to the patient, and patient dimensions affect the global and local electromagnetic exposure in human body models. Methods Three RF coil models were implemented, namely a specific two‐source (S2) feed and two multisource feed configurations: generic 32‐source (G32) and hybrid 16‐source (H16). Thirty‐two feeding conditions were studied for the S2, whereas two were studied for the G32 and H16. The study was performed using five human body models. Additionally, for two of the body models, the case of a partially implanted lead was evaluated. Results The results showed an overall variation due to coil feeding conditions of the whole‐body specific absorption rate (SAR) of less than 20%, but deviations up to 98% of the magnitude of the electric field tangential to a possible lead path. For the analysis with the partially implanted lead, a variation of local SAR at the tip of the lead of up to 60% was observed with respect to feed position and field orientation direction. Conclusion The results of this study suggest that specific information about feed position and field orientation direction must be considered for an accurate evaluation of patient exposure. Magn Reson Med 79:1135–1144, 2018. ? 2017 International Society for Magnetic Resonance in Medicine.
机译：目的本研究旨在研究传播射频（RF）线圈，场取向方向相对于患者的馈电源的位置以及患者尺寸如何影响人体模型中的全球和局部电磁暴露。方法实现了三个RF线圈模型，即特定的双源（S2）馈送和两个多源馈送配置：通用32源（G32）和混合16-源（H16）。研究了S2的三十二次进料条件，而两个用于G32和H16的两种饲养条件。使用五个人体模型进行该研究。另外，对于两个主体模型，评估部分植入的引线的情况。结果结果表明，由于线圈进给条件的整体特异性吸收率（SAR）小于20％，但偏差高达电场幅度的偏差与可能的铅道。对于具有部分注入的铅的分析，相对于进料位置和场取向方向，观察到最多60％的引线尖端的局部SAR的变化。结论本研究结果表明，必须考虑有关饲料位置和现场取向方向的特定信息，准确评估患者暴露。 Magn Reson Med 79：2018年1135-1144.？ 2017年医学磁共振的国际社会。

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