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  Spatial distribution of RF-induced E-fields and implant heating in MRI

Nordbeck, P., Fidler, F., Weiss, I., Warmuth, M., Friedrich, M., Ehses, P., et al. (2008). Spatial distribution of RF-induced E-fields and implant heating in MRI. Magnetic Resonance in Medicine, 60(2), 312-319. doi:10.1002/mrm.21475.

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Nordbeck, P, Author
Fidler, F, Author
Weiss, I, Author
Warmuth, M, Author
Friedrich, MT, Author
Ehses, P1, Author              
Geistert, W, Author
Ritter, O, Author
Jakob, PM, Author
Ladd, ME, Author
Quick, HH, Author
Bauer, WR, Author
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1External Organizations, ou_persistent22              

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 Abstract: The purpose of this study was to assess the distribution of RF-induced E-fields inside a gel-filled phantom of the human head and torso and compare the results with the RF-induced temperature rise at the tip of a straight conductive implant, specifically examining the dependence of the temperature rise on the position of the implant inside the gel. MRI experiments were performed in two different 1.5T MR systems of the same manufacturer. E-field distribution inside the liquid was assessed using a custom measurement system. The temperature rise at the implant tip was measured in various implant positions and orientations using fluoroptic thermometry. The results show that local E-field strength in the direction of the implant is a critical factor in RF-related tissue heating. The actual E-field distribution, which is dependent on phantom/body properties and the MR-system employed, must be considered when assessing the effects of RF power deposition in implant safety investigations.

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 Dates: 2008-08
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1002/mrm.21475
BibTex Citekey: NordbeckFWWFEGRJLQB2008
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 60 (2) Sequence Number: - Start / End Page: 312 - 319 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149