Abstract #0659
ZTE Imaging With Enhanced Flip Angle Using Modulated Excitation
Konrad Schieban 1 , Markus Weiger 1 , Franciszek Hennel 2 , Andreas Boss 3 , and Klaas Paul Pruessmann 1
1
Institute for Biomedical Engineering, ETH
Zurich, Zurich, Switzerland,
2
Bruker
BioSpin MRI GmbH, Ettlingen, Germany,
3
Institute
for Diagnostic and Interventional Radiology, University
Hospital Zurich, Zurich, Switzerland
Zero Echo Time (ZTE) MRI is a 3D radial projection
technique dedicated to imaging tissues with rapid
transverse relaxation. In ZTE imaging, RF excitation is
typically performed with short, block-shaped pulses of
limited flip angle, thus restricting T1-weighting and
possibly SNR. To overcome these limitations, it is
proposed here to replace the block pulse with frequency-
and amplitude modulated RF pulses. These are optimized
with respect to flip angle amplitude and uniformity over
the bandwidth spanned by the frequency encoding
gradients. The enhanced flip angle performance achieved
in this way is demonstrated experimentally in phantoms
and a tissue sample.
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