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Online correction of respiratory‐induced field disturbances for continuous MR‐thermometry in the breast
Author(s) -
Hey S.,
Maclair G.,
de Senneville B. D.,
LepetitCoiffe M.,
Berber Y.,
Köhler M. O.,
Quesson B.,
Moonen C. T. W.,
Ries M.
Publication year - 2009
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21954
Subject(s) - computer science , respiratory monitoring , phase (matter) , biomedical engineering , nuclear medicine , respiratory system , medicine , physics , quantum mechanics
MR‐thermometry allows monitoring of the local temperature evolution during minimally invasive interventional therapies. However, for the particular case of MR‐thermometry in the human breast, magnetic field variations induced by the respiratory cycle lead to phase fluctuations requiring a suitable correction strategy to prevent thermometry errors. For this purpose a look‐up‐table‐based multibaseline approach as well as a model‐based correction algorithm were applied to MR‐thermometry to correct for the periodic magnetic field changes. The proposed correction method is compatible with a variety of sensors monitoring the current respiratory state. The ability to remove phase artefacts during MR‐thermometry of the human breast was demonstrated experimentally in five healthy volunteers during 3 min of free‐breathing using pencil‐beam navigators for respiratory control. An increase of 170–530% in temperature precision was observed for the look‐up‐table‐based approach, whereas a further improvement by 16–36% could be achieved by applying the extended model‐based correction. Magn Reson Med, 61:1494–1499, 2009. © 2009 Wiley‐Liss, Inc.