查看“磁共振小组/磁共振兼容/Constructing a Digital Twin of the Birdcage Coil in an MR Scanner by Map Matching: For Radio Frequency Heating Evaluation of Implantable Medical Devices”的源代码

{{文章推荐|Reason=一种基于MRI系统的简单高效的射频测试环境建模方法|Journal=IEEE Transactions on Instrumentation and Measurement|PubYear=2022|DOI=10.1109/TIM.2022.3212552.|Category_=研究性工作|Domain=磁共振兼容|RecomBy=龙天罡|RecomGrp=磁共振小组|ReviewBy=姜老师|Abstract= Radio frequency (RF)-induced heating associated with medical implants is a critical concern when performing a magnetic resonance imaging (MRI) scan. The purpose of this study is to construct a “digital twin” of RF coil integrated in an MRI scanner by B1+ map matching, reproducing the physical electromagnetic (EM) field, allowing it to be a qualified test environment for heating evaluations. B1+ map inside an American Society for Testing Material (ASTM) phantom with various positions was used to characterize the physical EM field. A loaded tuned two-port birdcage body coil model was established to generate the numerical EM field and optimized to minimize the difference between the measured and simulated fields, which was quantified by “mean symmetric mean absolute percentage error” (mSMAPE). The amplitude of the simulated field was normalized to MR sequence labeling. Finally, the average specific absorption rate (SAR) inside the ASTM phantom was measured in a calorimetry experiment and compared to simulation one heated by the pre-established coil. A heating experiment was performed on an insulated cable to further validate the established test environment. The impact of excitation parameters and the port location was investigated. mSMAPE of the optimized field was less than 10%. The difference between the simulated and measured average SAR was 8.5%. R2 for the linear regression of the temperature rise and predicted power deposition using the optimized field was 0.993. The digital twin was successfully constructed and verified a sufficiently accurate description of the physical field. The established construction method of the digital twin provides a handy choice for building RF test environment and may create more possibilities for the development of this area.|DetaialsDM=射频致热-射频致热评估-线圈建模}}