Respiratory motion affects peak spatial SAR value and location – impact on safety supervision for 7T cardiac imaging
Natalie Schoen1, Frank Seifert1, Gregory J. Metzger2, Oliver Speck3, Bernd Ittermann1, and Sebastian Schmitter1,2
1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Berlin, Germany, 2Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 3Department for Biomedical Magnetic Resonance, Otto-von-Guericke University Magdeburg, Magdeburg, Germany
Respiratory motion impacts peak spatial specific absorption rate (psSAR) at cardiac UHF MR imaging as shown previously for individual$$$B_1^+$$$shim vectors. Here two saftey supervision modes were compared: a local SAR control mode (SCM) and a channel-wise power control mode (PCM).
Results show amplitude and location changes of the psSAR between inhale and exhale and this effect depends on the coil setup, element type and breathing pattern. Respiratory-induced psSAR variations are lower when applying PCM compared to SCM, while PCM is more conservative with respect to the total power allowed.
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