Abstract #0626

Impact of B1+-Shimming and 2-spoke pTx on 4D Angiography at 7T

Christian R. Meixner¹, Sebastian Schmitter^2,3, Jürgen Herrler⁴, Arnd Dörfler⁴, Michael Uder¹, and Armin M. Nagel^1,3

¹Institute of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany, ²Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, Germany, ³Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ⁴Institute of Neuro-Radiology, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany

4D-angiography exploiting pseudo-continuous arterial spin labeling at 7T suffers from specific absorption rate constraints, low B₁⁺ efficiency for the labeling and B₁⁺ inhomogeneity in the readout. In this work, we propose a B₁⁺-phase shim trading B₁⁺ homogeneity and transmit efficiency for the labeling combined with a dynamic transmission 2-spoke excitation readout. In volunteer measurements, the proposed approach outperformed the standard circular polarized mode by an increased vessel intensity and more vessel conspicuity.

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