Abstract

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Author(s):: CHANG Jihui1; LI Kai1; ZHANG Yun1; GUO Dehong1; TANG Dongmei1; DAI Ning1; ZHANG Shuang1; 2; 1. Department of Orthopaedics, the Peoples Hospital of Zhongjiang, Deyang 618000, China 2. Smart Medical Engineering Applications Laboratory, Neijiang Normal University, Neijiang 641100, China

Keywords:: Keywords: metal medical implant magnetic resonance imaging heating effect specific absorption ratio digital human

Abstract:: Abstract: Objective To analyze the local temperature rise caused by changes in the specific absorption ratio (SAR) of human body due to metal implant during magnetic resonance imaging. Methods On the basis of the digital human image dataset, a semi-refined geometric model of the upper part of human body was constructed through data segmentation and post-processing. The geometric model was imported into COMSOL, and a 3T magnetic resonance coil was built and the operating frequency was set at 128 MHz for analyzing the effect of metal implant on SAR and temperature changes. Results Through the comparison of the changes in SAR and temperature of different tissues before and after implantation, it was found that after implantation, SAR and temperature were 3 times higher than those before implantation, and that the changes mainly occurred around the metal implant. Conclusion In magnetic resonance imaging, metal implant can cause local rise of SAR near the implant in human body, which results in temperature rise around the implant, suggesting that long-term scanning will cause certain damages to human body.