Simulation of SAR Induced Heating in Infants undergoing 1.5 T Magnetic Resonance Imaging.
Annu Int Conf IEEE Eng Med Biol Soc
; 2021: 3382-3386, 2021 11.
Article
em En
| MEDLINE
| ID: mdl-34891965
ABSTRACT
RF absorption in patients undergoing MRI procedures poses a major safety risk due to resulting heating in the tissue. In order to stay below permitted temperature limits the SAR has to be quantified and limited. Based on the model of an infant inside a birdcage coil we have investigated the SAR distribution in the body at 1.5T. Thermal simulations could thus be performed to establish a relationship between the limitations of SAR and temperature. Results show a thermal hotspot in the neck region caused by high local absorption. The temperature limits in this local area were exceeded after 7min of excitation within regulatory SAR limits. For a long-term exposure critical organs in the body's core also undergo thermal stress beyond limitations. This indicates the need for constraints in regard to long MR procedures to consider the temporal aspect of heating.Clinical Relevance-This work establishes a relationship between SAR and temperature in infants undergoing MRI and shows potential risks of long-term procedures due to induced thermal stress.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ondas de Rádio
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Calefação
Limite:
Humans
Idioma:
En
Revista:
Annu Int Conf IEEE Eng Med Biol Soc
Ano de publicação:
2021
Tipo de documento:
Article