This paper presents a study on strategies of searching for the worst case configuration of a multi-configuration implantable system under magnetic resonance imaging, which induces the highest radio frequency energy exposure among all possible configurations. The strategies are usually based on parameter search to avoid brutal study of a huge number of possible configurations. Comparison studies of four different searching strategies, i.e., single sequential search, sequential search with the second worst case validations, hotspots-based sequential search, and multi-iteration sequential search, are evaluated. It is found that the initial configuration and sequence of parameter search can significantly affect the searched worst case configuration. For the multi-configuration system considered in this investigation, the simple sequential search strategy leads to a high probability of search failure, which means that the worst case configuration may be easily missed. Single sequential search with the second worst case validations and multi-iteration sequential search can significantly reduce the probability of search failure.

中文翻译：

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用于评估 MRI 下多配置植入系统最坏情况射频感应加热的搜索策略研究

本文介绍了在磁共振成像下搜索多配置植入式系统的最坏情况配置的策略的研究，该配置在所有可能的配置中引起最高的射频能量暴露。这些策略通常基于参数搜索，以避免对大量可能的配置进行粗暴的研究。对四种不同搜索策略的比较研究进行了评估，即单次顺序搜索、带有第二个最坏情况验证的顺序搜索、基于热点的顺序搜索和多次迭代顺序搜索。发现参数搜索的初始配置和顺序可以显着影响搜索的最坏情况配置。对于本次调查中考虑的多配置系统，简单的顺序搜索策略导致搜索失败的概率很高，这意味着很容易错过最坏情况的配置。带有次差情况验证的单次顺序搜索和多次迭代顺序搜索可以显着降低搜索失败的概率。