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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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