Abstract #0494
B0 changes around the head induced by the cardiac cycle at 7T
Lennart J. Geurts 1 , Vincent O. Boer 2 , Tijl A. van der Velden 2 , Peter R. Luijten 2 , Dennis W.J. Klomp 2 , and Jaco J.M. Zwanenburg 2
1
Radiology, UMC Utrecht, Utrecht, Utrecht,
Netherlands,
2
Radiology,
UMC Utrecht, Utrecht, Netherlands
This study assessed B0 fluctuations caused by the
cardiac cycle using fieldprobes positioned around the
headrest in a 7T MRI bore. Six volunteers were included
and 2400 field measurements were taken at a 100ms
interval. The maximum measured cardiac field fluctuation
amplitude was 7.0 nT. On average the cardiac field
fluctuation amplitude was 27% of the respiratory field
fluctuation. Because fieldprobes were used, there was no
confounding influence of pulsatile tissue motion. We
conclude that cardiac field fluctuations can be a
measurable contributor to B0 instability.
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