Investigation of Coupling Effect for Adjacent Orthopedic Implants on MRI Radio-Frequency Heating
10.12455/j.issn.1671-7104.240230
- VernacularTitle:相邻骨科植入物的磁共振射频致热耦合效应作用机理
- Author:
Ran GUO
1
;
Zhichao WANG
;
Jing WANG
;
Chengling LI
;
Yonghua LI
;
Sheng HU
Author Information
1. 上海市医疗器械检验研究院,上海市,201318
- Keywords:
finite-difference time domain;
Huygens source;
magnetic resonance imaging;
orthopedic implants;
radio-frequency heating;
coupling effect
- From:
Chinese Journal of Medical Instrumentation
2024;48(5):478-485
- CountryChina
- Language:Chinese
-
Abstract:
This paper investigates the mechanism of radio-frequency(RF)heating that occurs when two adjacent orthopedic implants are present together under magnetic resonance imaging(MRI)at 1.5 Tesla and 3.0 Tesla.When a patient has multiple implants close to each other,interactions between the implants may increase RF heating.Typical generic interlocking plate and antibiotic nail implants are adopted as examples.To analyze the effect of adjacent implants,the amplitude and direction of incident and scattering vector electric fields at the hot spot position are calculated and extracted using numerical simulation based on Huygens principle.It is shown that a strong coupling effect occurs due to the existence of both the incident field and a strong scattering field.Huygens principle can be used to obtain the first and second order scattering fields generated between implants.If the first-and second-order electric field terms are summed within a certain region,the RF-induced heating of this dual-implant system increases.
