Power absorption measurements during NMR experiments

Felix González, Nazario and Urbano Bojorge, Ana Lorena and Sanchez Lopez de Pablo, Cristina and Ferro Llanos, Vicente and Pozo Guerrero, Francisco del and 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.2014.19.2.155.

Description

Title: Power absorption measurements during NMR experiments
Author/s:
  • Felix González, Nazario
  • Urbano Bojorge, Ana Lorena
  • Sanchez Lopez de Pablo, Cristina
  • Ferro Llanos, Vicente
  • Pozo Guerrero, Francisco del
  • Serrano Olmedo, Jose Javier
Item Type: Article
Título de Revista/Publicación: Journal of Magnetics
Date: June 2014
ISSN: 1226-1750
Volume: 19
Subjects:
Freetext Keywords: Magnetoresistive effect, NMR, Power release, RF power absorption, thermal power
Faculty: Centro de Tecnología Biomédica (CTB) (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 31093
DC Identifier: http://oa.upm.es/31093/
OAI Identifier: oai:oa.upm.es:31093
DOI: 10.4283/JMAG.2014.19.2.155
Official URL: http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=E1MGAB_2014_v19n2_155
Deposited by: Memoria Investigacion
Deposited on: 12 Apr 2015 08:19
Last Modified: 26 Apr 2019 11:49
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