Assessment of radiofrequency self-heating around a metallic wire with MR T1-based thermometry.
Magn Reson Med
; 66(2): 448-55, 2011 Aug.
Article
em En
| MEDLINE
| ID: mdl-21360744
ABSTRACT
Heat produced by a magnetic resonance (MR) imaging sequence in the vicinity of a conductive wire (pacemaker, electrodes, or catheter), is a subject of interest for the assessment of patient safety during imaging. For this purpose, the measurement of temperature rises during an MR imaging sequence using MR T1-based thermometry provides several advantages, mainly in its ability to retrieve in situ real-time thermal maps. Recent studies investigated the heat produced by an independent radiofrequency pulse, assessing MR imaging sequence heating using a specific MR thermometry sequence. This study focuses on self-heating for which the radiofrequency pulses used for measuring temperature create the heat. An experimental design was set up to evaluate T1-based thermometry self-heating using a coupled/decoupled wire and to compare it with a reference temperature gathered by an optical fiber device. For the tested experimental set up, T1-based thermometry is in fairly good agreement with optical fiber reference temperature.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Próteses e Implantes
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Imageamento por Ressonância Magnética
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Termografia
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Temperatura Alta
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Metais
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article