Warming Effect and Safety Analysis of Metal Implants in MR Examination
HE Weia, WANG Chuanbingb, GAO Honga, ZHANG Huia, WANG Yinga, SUN Xiaoleia
a. Department of Clinical Medical Engineering; b. Department of Radiology, The First Affiliated Hospital of Nanjing Medical
University, Nanjing Jiangsu 210029, China
Abstract：Objective To investigate the thermal effect and safety of metal implants (titanium alloy, stainless steel) during
magnetic resonance (MR) scanning. Methods The pig legs with metal implants were used to simulate the human body with
metal implants. The calibrated thermistors were inserted near the metal implants as a temperature senso. When performing MR
scanning, the resistance or voltage of thermistor was collected by digital multimeter or homemade circuit, and the temperature
change around the metal implant can be indirectly measured by a resistance (voltage)-temperature conversion. Results The
temperature values obtained by the high precision multimeter were close to that obtained by homemade circuit. SE sequence had the
greatest thermal effect. The average temperature rise near the tissue caused by titanium alloy and stainless steel implants was about
0.5℃ and 1.5℃, respectively. The temperature rise of stainless steel was higher than that of titanium alloy in various sequence scanning.
Conclusion Patients with metal implants are at risk of having an MR scanning, which must be evaluated by a professional
physician before performing inspect.
何伟a，王传兵b，高虹a，张晖a，汪缨a，孙小磊a. 金属植入物在磁共振检查中的致升温效应及安全性分析[J]. 中国医疗设备, 2019, 34(6): 49-52.
HE Weia, WANG Chuanbingb, GAO Honga, ZHANG Huia, WANG Yinga, SUN Xiaoleia. Warming Effect and Safety Analysis of Metal Implants in MR Examination. China Medical Devices, 2019, 34(6): 49-52.
