Genetic algorithm search for the worst‐case MRI RF exposure for a multiconfiguration implantable fixation system modeled using artificial neural networks
Genetic algorithm search for the worst‐case MRI RF exposure for a multiconfiguration implantable fixation system modeled using artificial neural networks
复制标题
遗传算法搜索使用人工神经网络建模的多配置植入固定系统的最坏情况 MRI 射频暴露
DOI:
10.1002/mrm.28319
复制
发表时间:
2020
影响因子:
3.3
通讯作者:
Chen, Ji
中科院分区:
文献类型:
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作者:
Zheng, Jianfeng;Lan, Qianlong;Kainz, Wolfgang;Long, Stuart A.;Chen, Ji
PurposeThis paper presents a method to search for the worst‐case configuration leading to the highest RF exposure for a multiconfiguration implantable fixation system under MRI.MethodsA two‐step method combining an artificial neural network and a genetic algorithm is developed to achieve this purpose. In the first step, the level of RF exposure in terms of peak 1‐g and/or 10‐g averaged specific absorption rate (SAR1g/10g), related to the multiconfiguration system, is predicted using an artificial neural network. A genetic algorithm is then used to search for the worst‐case configuration of this multidimensional nonlinear problem within both the enumerated discrete sample space and generalized continuous sample space. As an example, a generic plate system with a total of 576 configurations is used for both 1.5T and 3T MRI systems.ResultsThe presented method can effectively identify the worst‐case configuration and accurately predict the SAR1g/10gwith no more than 20% of the samples in the studied discrete sample space, and can even predict the worst case in the generalized continuous sample space. The worst‐case prediction error in the generalized continuous sample space is less than 1.6% for SAR1gand less than 1.3% for SAR10gcompared with the simulation results.ConclusionThe combination of an artificial neural network with genetic algorithm is a robust technique to determine the worst‐case RF exposure level for a multiconfiguration system, and only needs a small amount of training data from the entire system.
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DOI:
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发表时间:
2020
期刊:
IEEE transactions on electromagnetic compatibility (Print)
影响因子:
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作者:
Jianfeng Zheng;Xiaohe Ji;W. Kainz;Ji Chen
通讯作者:
Ji Chen
DOI:
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发表时间:
2019
期刊:
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting
影响因子:
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作者:
Qianlong Lan;Jianfeng Zheng;Ji Chen
通讯作者:
Ji Chen
DOI:
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发表时间:
2017
期刊:
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
影响因子:
--
作者:
Qi Zeng;Ran Guo;Jianfeng Zheng;Ji Chen
通讯作者:
Ji Chen
DOI:
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发表时间:
2016
期刊:
2016 IEEE International Symposium on Electromagnetic Compatibility (EMC)
影响因子:
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作者:
Jianfeng Zheng;Dawei Li;Ji Chen;W. Kainz
通讯作者:
W. Kainz