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 Schaeffter^1,2, and Sebastian Schmitter^1,3

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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