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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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