Abstract #4920
Non-Enhanced MR Angiography of the Lower Extremity Arteries at 7T: Correction of Saturation Pulse Artifacts
Sren Johst 1,2 , Stephan Orzada 1,2 , Mark E. Ladd 1,3 , and Stefan Maderwald 1
1
Erwin L. Hahn Institute for MRI, University
Duisburg-Essen, Essen, Germany,
2
Diagnostic
and Interventional Radiology and Neuroradiology,
University Hospital Essen, University Duisburg-Essen,
Essen, Germany,
3
Medical
Physics in Radiology, German Cancer Research Center
(dkfz), Heidelberg, Germany
In recently published work, a turbo-FLASH sequence was
modified for non-contrast-enhanced imaging of the lower
extremity vessels at 7T. To reduce acquisition time,
venous saturation RF pulses were applied every second
TR. This led to an aliasing artifact caused by periodic
signal variation due to alternating TR length. Here,
theoretical flip angles for artifact reduction depending
on both TRs were calculated and compared to experimental
data from phantom measurements. Due to the inhomogeneous
transmit field at 7T, the artifact could not be
suppressed completely and thus additional methods such
as special k-space ordering may need to be implemented.
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