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Abstract #4211

Reduction of artefacts in Bloch-Siegert based $$$B_1^+$$$-Mapping in CPMG-Sequences with imperfect refocussing pulses

Volker JF Sturm1,2, Thomas Kampf3,4, Lukas R Buschle2, Ke Zhang2, Peter M Jakob4, Mirko Pham3, Christian Ziener2, Martin Bendszus1, Sabine Heiland1, and Felix T Kurz1,2

1Experimental Neuroradiology, University Hospital Heidelberg, Heidelberg, Germany, 2German Cancer Research Center, Heidelberg, Germany, 3Diagnostic and Interventional Neuroradiology, University Hospital Würzburg, Würzburg, Germany, 4Experimental Physics V, University Würzburg, Würzburg, Germany

The Bloch-Siegert-effect imprints the rf-coil’s transmission field in the phase of the acquired signal. Consequently the measured amplitude information can be used to determine other MR-Parameter. A previously published sequence based on a CPMG spin echo train uses both information pathways and allows simultaneous acquisition of $$$T_2$$$- and $$$B_1^+$$$-maps. However, the formerly proposed method produces potentially erroneous $$$B_1^+$$$-map in inhomogeneous $$$B_0$$$-fields.

This work presents a method to reduce those errors by combining signal from different echoes. This allows a robust measurement of $$$B_1^+$$$-maps in inhomogeneous $$$B­_0$$$-fields as present in high-field MRI with simultaneous $$$T_2­$$$ quantification.

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