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Abstract #3947

Respiration induced B1+ changes and its compensation via respiration robust 3D kT point pulses in 7T body imaging

Christoph Stefan Aigner1, Sebastian Dietrich1, Tobias Schaeffter1,2, and Sebastian Schmitter1,3
1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany, 2Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom, 3Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany

We demonstrate the design and application of respiration-specific and respiration-robust three-dimensional 4kT-point pTx pulses using respiration-resolved 3D B1+ maps. The subject-specific pulses were tested on 20 B1+ maps (shallow/deep breathing) of 10 volunteers with different age and BMI and were experimentally validated in the last three volunteers at 7T. Compared to respiration-specific pulses, respiration-robust pulses resulted in a negligible overall decrease of the FA homogeneity with clear benefits of achieving homogeneous 3D FA across all respiration states.

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