Power absorption measurements during NMR experiments

Felix González, Nazario; Urbano Bojorge, Ana Lorena; Sanchez Lopez de Pablo, Cristina; Ferro Llanos, Vicente; Pozo Guerrero, Francisco del y Serrano Olmedo, Jose Javier (2014). Power absorption measurements during NMR experiments. "Journal of Magnetics", v. 19 (n. 2); pp. 155-160. ISSN 1226-1750. https://doi.org/10.4283/JMAG.2014.19.1.XXX.

Descripción

Título: Power absorption measurements during NMR experiments
Autor/es:
  • Felix González, Nazario
  • Urbano Bojorge, Ana Lorena
  • Sanchez Lopez de Pablo, Cristina
  • Ferro Llanos, Vicente
  • Pozo Guerrero, Francisco del
  • Serrano Olmedo, Jose Javier
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Magnetics
Fecha: Junio 2014
Volumen: 19
Materias:
Palabras Clave Informales: Magnetoresistive effect, NMR, Power release, RF power absorption, thermal power
Escuela: Centro de Tecnología Biomédica (CTB) (UPM)
Departamento: Otro
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The heating produced by the absorption of radiofrequency (RF) has been considered a secondary undesirable effect during MRI procedures. In this work, we have measured the power absorbed by distilled water, glycerol and egg-albumin during NMR and non-NMR experiments. The samples are dielectric and examples of different biological materials. The samples were irradiated using the same RF pulse sequence, whilst the magnetic field strength was the variable to be changed in the experiments. The measurements show a smooth increase of the thermal power as the magnetic field grows due to the magnetoresistive effect in the copper antenna, a coil around the probe, which is directly heating the sample. However, in the cases when the magnetic field was the adequate for the NMR to take place, some anomalies in the expected thermal powers were observed: the thermal power was higher in the cases of water and glycerol, and lower in the case of albumin. An ANOVA test demonstrated that the observed differences between the measured power and the expected power are significant.

Más información

ID de Registro: 31093
Identificador DC: http://oa.upm.es/31093/
Identificador OAI: oai:oa.upm.es:31093
Identificador DOI: 10.4283/JMAG.2014.19.1.XXX
URL Oficial: http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=E1MGAB_2014_v19n2_155
Depositado por: Memoria Investigacion
Depositado el: 12 Abr 2015 08:19
Ultima Modificación: 12 Abr 2015 08:19
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