Department of Information Science and Engineering, Lanzhou University, Lanzhou, China.
Centre for Medical Device Evaluation, National Medical Products Administration, Beijing, China.
Front Public Health. 2021 Dec 13;9:793418. doi: 10.3389/fpubh.2021.793418. eCollection 2021.
Elongated conductors, such as pacemaker leads, can couple to the MRI radio-frequency (RF) field during MRI scan and cause dangerous tissue heating. By selecting proper RF exposure conditions, the RF-induced power deposition can be suppressed. As the RF-induced power deposition is a complex function of multiple clinical factors, the problem remains how to perform the exposure selection in a comprehensive and efficient way. The purpose of this work is to demonstrate an exposure optimization trail that allows a comprehensive optimization in an efficient and traceable manner. The proposed workflow is demonstrated with a generic 40 cm long cardio pacemaker, major components of the clinical factors are decoupled from the redundant data set using principle component analysis, the optimized exposure condition can not only reduce the power deposition but also maintain good image quality.
在 MRI 扫描期间，诸如心脏起搏器导联等细长导体可能会与 MRI 射频 (RF) 场耦合，并导致危险的组织加热。通过选择适当的 RF 暴露条件，可以抑制 RF 诱导的功率沉积。由于 RF 诱导的功率沉积是多个临床因素的复杂函数，问题仍然是如何以全面和有效的方式进行暴露选择。本工作旨在演示一种暴露优化试验，该试验允许以有效且可追溯的方式进行全面优化。所提出的工作流程使用通用的 40cm 长心脏起搏器进行演示，使用主成分分析从冗余数据集分离出临床因素的主要成分，优化后的暴露条件不仅可以降低功率沉积，还可以保持良好的图像质量。
