Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Doryong-dong, Yuseong-gu, Daejeon, 34113, Republic of Korea.
Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Sci Rep. 2021 Jan 13;11(1):1134. doi: 10.1038/s41598-020-80828-7.
A primary safety concern in a magnetic resonance imaging environment is heating of metallic implants by absorbing radiofrequency (RF) energy during MRI scanning. Experimental measurement in conjunction with computational modeling was used to evaluate the risk of biological tissue injury from the RF heating of artificial hip joints by obtaining both specific absorption rate (SAR) and temperature elevation at 1.5 T and 3 T MRI systems. Simulation result showed that high SAR and high temperature appeared near both head and tail sections of the artificial hip joints. For five different 1.5 T and 3 T MRI systems, measured temperature location showed that high temperature rises occurred near both head and tail regions of the metallic hip joints. Measured SAR value of 24.6 W/kg and the high temperature rise (= 4.22 °C) occurred in the tail region of the hip joint at 1.5 T, which was higher than the limits for temperature required by the international electrotechnical commission 60601-2-33. We have demonstrated the feasibility of evaluating RF heating of metallic hip joints during MRI scans.
在磁共振成像（MRI）环境中，主要的安全问题是金属植入物在 MRI 扫描过程中吸收射频（RF）能量而发热。本研究通过实验测量和计算建模来评估人工髋关节在 1.5T 和 3T MRI 系统中因 RF 加热导致生物组织损伤的风险，得到了比吸收率（SAR）和温度升高值。模拟结果显示，人工髋关节的头部和尾部附近会出现高 SAR 和高温。对于五种不同的 1.5T 和 3T MRI 系统，测量得到的温度位置显示，金属髋关节的头部和尾部附近会出现高温升高。在 1.5T 下，髋关节尾部的 SAR 值测量值为 24.6W/kg，温度升高（=4.22°C），高于国际电工委员会 60601-2-33 规定的温度限值。我们已经证明了在 MRI 扫描过程中评估金属髋关节 RF 加热的可行性。
