Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation

Christopher P Favazza, Deirdre M King, Heidi A Edmonson, Joel P Felmlee, Phillip J Rossman, Nicholas J Hangiandreou, Robert E Watson, Krzysztof R Gorny Department of Radiology, Mayo Clinic, Rochester, MN, USA Abstract: Radiofrequency (RF) shields have been recently developed for the purpose of shi...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Favazza CP, King DM, Edmonson HA, Felmlee JP, Rossman PJ, Hangiandreou NJ, Watson RE, Gorny KR
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2014
Materias:	Medical technology R855-855.5
Acceso en línea:	https://doaj.org/article/59f2e08b1d1e45418f897efe0f7c4060
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:59f2e08b1d1e45418f897efe0f7c4060
record_format	dspace
spelling	oai:doaj.org-article:59f2e08b1d1e45418f897efe0f7c40602021-12-02T00:35:20ZUse of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation1179-1470https://doaj.org/article/59f2e08b1d1e45418f897efe0f7c40602014-10-01T00:00:00Zhttp://www.dovepress.com/use-of-a-radio-frequency-shield-during-15-and-30-tesla-magnetic-resona-peer-reviewed-article-MDERhttps://doaj.org/toc/1179-1470 Christopher P Favazza, Deirdre M King, Heidi A Edmonson, Joel P Felmlee, Phillip J Rossman, Nicholas J Hangiandreou, Robert E Watson, Krzysztof R Gorny Department of Radiology, Mayo Clinic, Rochester, MN, USA Abstract: Radiofrequency (RF) shields have been recently developed for the purpose of shielding portions of the patient's body during magnetic resonance imaging (MRI) examinations. We present an experimental evaluation of a commercially available RF shield in the MRI environment. All tests were performed on 1.5 T and 3.0 T clinical MRI scanners. The tests were repeated with and without the RF shield present in the bore, for comparison. Effects of the shield, placed within the scanner bore, on the RF fields generated by the scanner were measured directly using tuned pick-up coils. Attenuation, by as much as 35 dB, of RF field power was found inside the RF shield. These results were supported by temperature measurements of metallic leads placed inside the shield, in which no measurable RF heating was found. In addition, there was a small, simultaneous detectable increase (~1 dB) of RF power just outside the edges of the shield. For these particular scanners, the autocalibrated RF power levels were reduced for scan locations prescribed just outside the edges of the shield, which corresponded with estimations based on the pick-up coil measurements. Additionally, no significant heating during MRI scanning was observed on the shield surface. The impact of the RF shield on the RF fields inside the magnet bore is likely to be dependent on the particular model of the RF shield or the MRI scanner. These results suggest that the RF shield could be a valuable tool for clinical MRI practices. Keywords: radiofrequency shield, magnetic resonance imaging, radiofrequency attenuationFavazza CPKing DMEdmonson HAFelmlee JPRossman PJHangiandreou NJWatson REGorny KRDove Medical PressarticleMedical technologyR855-855.5ENMedical Devices: Evidence and Research, Vol 2014, Iss default, Pp 363-370 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medical technology R855-855.5
spellingShingle	Medical technology R855-855.5 Favazza CP King DM Edmonson HA Felmlee JP Rossman PJ Hangiandreou NJ Watson RE Gorny KR Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation
description	Christopher P Favazza, Deirdre M King, Heidi A Edmonson, Joel P Felmlee, Phillip J Rossman, Nicholas J Hangiandreou, Robert E Watson, Krzysztof R Gorny Department of Radiology, Mayo Clinic, Rochester, MN, USA Abstract: Radiofrequency (RF) shields have been recently developed for the purpose of shielding portions of the patient's body during magnetic resonance imaging (MRI) examinations. We present an experimental evaluation of a commercially available RF shield in the MRI environment. All tests were performed on 1.5 T and 3.0 T clinical MRI scanners. The tests were repeated with and without the RF shield present in the bore, for comparison. Effects of the shield, placed within the scanner bore, on the RF fields generated by the scanner were measured directly using tuned pick-up coils. Attenuation, by as much as 35 dB, of RF field power was found inside the RF shield. These results were supported by temperature measurements of metallic leads placed inside the shield, in which no measurable RF heating was found. In addition, there was a small, simultaneous detectable increase (~1 dB) of RF power just outside the edges of the shield. For these particular scanners, the autocalibrated RF power levels were reduced for scan locations prescribed just outside the edges of the shield, which corresponded with estimations based on the pick-up coil measurements. Additionally, no significant heating during MRI scanning was observed on the shield surface. The impact of the RF shield on the RF fields inside the magnet bore is likely to be dependent on the particular model of the RF shield or the MRI scanner. These results suggest that the RF shield could be a valuable tool for clinical MRI practices. Keywords: radiofrequency shield, magnetic resonance imaging, radiofrequency attenuation
format	article
author	Favazza CP King DM Edmonson HA Felmlee JP Rossman PJ Hangiandreou NJ Watson RE Gorny KR
author_facet	Favazza CP King DM Edmonson HA Felmlee JP Rossman PJ Hangiandreou NJ Watson RE Gorny KR
author_sort	Favazza CP
title	Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation
title_short	Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation
title_full	Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation
title_fullStr	Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation
title_full_unstemmed	Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation
title_sort	use of a radio frequency shield during 1.5 and 3.0 tesla magnetic resonance imaging: experimental evaluation
publisher	Dove Medical Press
publishDate	2014
url	https://doaj.org/article/59f2e08b1d1e45418f897efe0f7c4060
work_keys_str_mv	AT favazzacp useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation AT kingdm useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation AT edmonsonha useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation AT felmleejp useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation AT rossmanpj useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation AT hangiandreounj useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation AT watsonre useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation AT gornykr useofaradiofrequencyshieldduring15and30teslamagneticresonanceimagingexperimentalevaluation
_version_	1718403620161978368

Use of a radio frequency shield during 1.5 and 3.0 Tesla magnetic resonance imaging: experimental evaluation

Ejemplares similares