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The Impact of Respiratory Motion on Electromagnetic Fields and Specific Absorption Rate in Cardiac Imaging at 7T


A major challenge of cardiac ultrahigh field magnetic resonance imaging (MRI) is the impact of respiratory motion. Not only the image quality is limited by varying B1+-inhomogeneities, but also the spatial distribution of the specific absorption rate (SAR) and hence the safety relevant power limits are affected by respiratory motion. To quantify these effects, Natalie Schön (AG 8.14) and colleagues implemented a respirating body model in electromagnetic field simulations of a 7T transceiver body array, using finite-difference time-domain (FDTD) simulations. For different respiratory states and array configurations, the impact of respiration was investigated and analysed in terms of B1+-inhomogeneity and SAR for different safety approaches. This cooperative work of PTB groups 8.14 and 8.11, Magdeburg University (OVGU) and the Center for Magnetic Resonance Research of the University of Minnesota has now been published in Magnetic Resonance in Medicine. (doi: https://doi.org/10.1002/mrm.29402).


Natalie Schön, E-Mail: Opens local program for sending emailNatalie.Schoen(at)ptb.de


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