Numerical simulation in magnetic resonance imaging radiofrequency dosimetry

• Published in: Biomedical physics & engineering express Vol. 10; no. 5; pp. 55042 - 55054
• Main Authors: Subaar, Christiana, Gyan, Emmanuel, Dompreh, Kwadwo A, Amoako, Joseph K, Edusei, George, Owusu, Alfred
• Format: Journal Article
• Language: English
• Published: England IOP Publishing 03.09.2024
• Subjects: electromagnetic field; invasive; radiofrequency; temperature; in-vivo; temperature; Electromagnetic field; invasive; radiofrequency
• ISSN: 2057-1976; 2057-1976
• DOI: 10.1088/2057-1976/ad6a68

Magnetic Resonance Imaging (MRI) employs a radiofrequency electromagnetic field to create pictures on a computer. The consequences of radiofrequency (RF) absorption include the heating of the tissue and the patient's capacity to remove excess heat. The prospective biological consequences of exposure to radiofrequency electromagnetic fields (RF EMFs) have not yet been demonstrated, and there is not enough evidence on biological hazards to offer a definite response concerning possible RF health dangers. Therefore, it is crucial to research the health concerns in reaction to RF EMFs, considering the entire exposure in terms of patients receiving MRI. Monitoring increases in temperature in-vivo throughout MRI is extremely invasive and has resulted in a rise in the utilization of computational methods to estimate distributions of temperatures. The purpose of this study is to estimate the absorbed power of the brain exposed to RF in patients undergoing brain MRI. A three-dimensional Penne's bio-heat equation was modified to computationally analyze the effects of RF radiation at frequencies exceeding 100 kHz exposures on the brain. The instantaneous temperature distributions of the in-vivo tissue in the brain temperatures measured at a time, t = 20.62 seconds is 0.2 °C and t = 30.92 seconds is 0.4 °C, while the highest temperatures recorded at 1.03 minutes and 2.06 minutes were 0.4 °C and 0.6 °C accordingly. From the temperature distributions of the in-vivo tissue in the brain temperatures measured, there is heat build-up in patients who are exposed to electromagnetic frequency ranges, and, consequently, temperature increases within patients are difficult to prevent. The study has, however, indicated that lengthier imaging duration appears to be related to increasing body temperature.&#xD.