Study on RF Heating of Implants in Different Conductivity Medium / 中国医疗器械杂志
Chinese Journal of Medical Instrumentation
; (6): 497-501, 2023.
Artículo
en Chino
| WPRIM (Pacífico Occidental)
| ID: wpr-1010227
Biblioteca responsable:
WPRO
ABSTRACT
In MRI examination, RF heating of implants will affect the safety of implant wearers. The conductivity of various tissues in the human body is significantly different, and the medium conductivity will affect the distribution of the RF electric field. Therefore, it is necessary to study the RF heating of different medium conductivity. Based on the analysis of the principle of MRI RF heating, this study build the model of the bird cage coil, ASTM standard phantom and lead, and the conductivity of several typical human tissues is selected as the conductivity in the experiment. Then calculate the power deposition of the lead at 64 MHz. The results show that the medium conductivity has no effect on the distribution of electric field and power deposition, and the hot spot distribution remains unchanged under different conductivity; The smaller the conductivity is, the larger the power deposition of the lead is, and the greater the temperature rise of the lead caused by RF heating is; The change of conductivity and power deposition is approximately linear. At the limit of 2 W/kg whole body specific absorption rate(SAR), the conductivity decreases, and the wire power deposition increases sharply.
Texto completo:
Disponible
Base de datos:
WPRIM (Pacífico Occidental)
Idioma:
Chino
Revista:
Chinese Journal of Medical Instrumentation
Año:
2023
Tipo del documento:
Artículo