Electromagnetic simulation of RF burn injuries occurring at skin-skin and skin-bore wall contact points in an MRI scanner with a birdcage coil

Tang, Minghui; Okamoto, Kiyoi; Haruyama, Takuya; Yamamoto, Toru

Electromagnetic simulation of RF burn injuries occurring at skin-skin and skin-bore wall contact points in an MRI scanner with a birdcage coil

Tang, Minghui; Okamoto, Kiyoi; Haruyama, Takuya et al.

Physica medica : European journal of medical physics, 2021, 82, 219-227

Permalink : https://hdl.handle.net/2115/83982

このアイテムのアクセス数:449件（2026-02-09 14:42 集計）

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/83982
タイトル	Electromagnetic simulation of RF burn injuries occurring at skin-skin and skin-bore wall contact points in an MRI scanner with a birdcage coil
著者	Tang, Minghui ; Okamoto, Kiyoi ; Haruyama, Takuya ; Yamamoto, Toru
e-Rad_Researcher 80794156 著者名 Tang, Minghui
著者名 Okamoto, Kiyoi
著者名 Haruyama, Takuya
e-Rad_Researcher 80261361 著者名 Yamamoto, Toru
言語	英語
キーワード	Magnetic resonance safety
	Radiofrequency burn
	Specific absorption rate
	SAR
	Electromagnetic simulation
発行日	2021-02
出版者	Elsevier
収録物名	Physica medica : European journal of medical physics
巻(号)	82
ページ	219-227
抄録	Purpose: To simulate radiofrequency (RF) burns that frequently occur at skin-skin and skin-bore wall contact points. Methods: RF burn injuries (thumb-thigh and elbow-bore wall contacts) that typically occur on the lateral side of the body during 1.5 T magnetic resonance imaging (MRI) scans were simulated using a computational human model. The model was shifted to investigate the influence of the position of the patient in an MRI scanner. The specific absorption rate (SAR), electric field, and temperature were mapped. Results: Regarding the contact points located near the edge of the birdcage transmission coil, under the allowable maximum RF power exposure i.e., the average whole-body SAR at the safety limit value (2 W/kg), the 10-g-tissue-averaged SAR (SAR10g) at those points significantly increased for both the thumb-thigh (180 W/kg) and elbow-bore wall (48 W/kg) cases. Both values significantly exceeded the highest safety limit of the partial-body SAR (10 W/kg). The electric field, the square of which is proportional to SAR, was remarkably high near the edge of the birdcage transmission coil. The peak SAR10g for each injury case was associated with contact-point peak temperatures that reached 52 ℃ at approximately 1 min following RF exposure onset; a 1-min period of exposure to this temperature causes a first-degree burn. Conclusions: We demonstrated high heat generation in RF burn injury cases in silico. The RF heating occurring on the lateral side of the body was strongly dependent on the electric field distribution, which is dominantly determined by an RF transmission coil.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© 2021, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	1120-1797
関連情報	PMID 33657471
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.ejmp.2021.02.008