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Abstract #0151

Inhomogeneous Magnetization Transfer Steady State Imaging at 0.5T: Exploring SAR and B1+RMS envelope.

Andrew T Curtis1 and Chad T Harris1
1Research and Development, Synaptive Medical, Toronto, ON, Canada

A balanced steady state sequence with multiband saturation pulses was implemented on a 0.5T scanner to assess the potential for additional inhomogeneous magnetization transfer contrast generation from the higher SAR and B1+RMS limits. Volumes were acquired with B1+RMS saturation less than 15uT. Initial results are promising with ihMT contrast scaling nearly linearly with applied B1+ as expected, achieving contrast levels of 12-16% in white matter for B1+RMS of 15uT. This linear contrast increase could directly offset losses in polarization efficiency from mid-field as compared to high field, providing an interesting application area with competitive CNR.

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