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Elliptical subject‐specific model of respiratory motion for cardiac MRI
Author(s) -
Burger Ian,
Meintjes Ernesta M.
Publication year - 2013
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.24502
Subject(s) - diaphragm (acoustics) , affine transformation , cardiac cycle , motion (physics) , breathing , linear model , nonlinear system , position (finance) , mathematics , magnetic resonance imaging , computer science , medicine , cardiology , radiology , artificial intelligence , physics , geometry , statistics , anatomy , vibration , acoustics , finance , quantum mechanics , economics
Respiratory motion is a major problem in cardiac MRI. In this work, the displacement of the heart relative to the diaphragm was investigated. A subject‐specific nonlinear elliptical affine model has been developed to incorporate the effect of hysteresis in motion correction. Nine healthy volunteers participated in a study in which the diaphragm position and an image of the heart were acquired during each cardiac cycle, while breathing freely. The elliptical model was compared to a linear affine model, and the results show that the elliptical model performed significantly ( P < 0.05) better than the linear model. Further, it has been established that the model can be constructed from 25 s of prescan data, which makes it feasible to perform a short prescan to construct the model, so that subject‐specific prospective motion correction of the heart can be integrated into structural cardiac MRI sequences. Magn Reson Med 70:722–731, 2013. © 2012 Wiley Periodicals, Inc.