Evaluation of the effects of motion on dynamic pTx pulse optimization at 7T
Motivation: The performance of dynamic pTx pulses might be affected by patient motion, especially in the case of long scanning sessions. Goal(s): To examine the actual impact of motion on the flip angle map of a pTx pulse optimized with a fast online customization (FOCUS) strategy. Approach: B0 and multi-channel B1+ maps were acquired at multiple head positions, and the application of the pulse optimized on the first position was simulated on the subsequent positions. Results: For various ranges of motion measured in this study, FOCUS pTx pulses are demonstrated to be robust to motion occurring after the acquisition of the field maps. Impact: Fast online customized pTx pulses suffer from motion during long scanning sessions, mainly due to changes in B1+ field distribution. However, for motion amplitudes comparable to what was measured, the negative impact on low flip angle non-selective pulses is negligible.
Authors
- Tom Hilbert (ORCID: https://orcid.org/0000-0001-8207-4908)
- Patrick Alexander Liebig (ORCID: https://orcid.org/0000-0001-7342-3715)
- Robin Martin Heidemann (ORCID: https://orcid.org/0000-0001-7556-7405)
- Gian Franco Piredda (ORCID: https://orcid.org/0000-0002-8449-6634)
- Jocelyn Philippe (ORCID: https://orcid.org/0009-0009-5952-6107)
- Jürgen Herrler (ORCID: https://orcid.org/0000-0002-4620-8216)
- Jean‐Philippe Thiran (ORCID: https://orcid.org/0000-0003-2938-9657)
- Thomas Yu (ORCID: https://orcid.org/0000-0002-5841-0198)
- Antoine Klauser (ORCID: https://orcid.org/0000-0003-3019-9914)
- Tobias Kober (ORCID: https://orcid.org/0000-0001-7598-9456)
- Emilie Sleight (ORCID: https://orcid.org/0000-0003-0034-4578)
- Natalia Pato Montemayor (ORCID: https://orcid.org/0009-0006-7212-1970)
Publication Details
- Journal
- Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
- Published
- 2025-09-16
- DOI
- https://doi.org/10.58530/2025/3440
- Primary Topic
- Nuclear Physics and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00