ArticleMagnetic resonance in medicine2015
Design of parallel transmission radiofrequency pulses robust against respiration in cardiac MRI at 7 Tesla.
Article in Magnetic resonance in medicine, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- In Vivo 3D Liver Imaging at 7 T Using kT-Point pTx Pulses and a 32-Tx-Channel Whole-Body Radiofrequency Coil Array.NMR in biomedicine · 2025Article
- Free-breathing high-resolution respiratory-gated radial stack-of-stars magnetic resonance imaging of the upper abdomen at 7 T.NMR in biomedicine · 2024Article
- A modular motion compensation pipeline for prospective respiratory motion correction of multi-nuclear MR spectroscopy.Scientific reports · 2024Article
- Article
- Progress in Imaging the Human Torso at the Ultrahigh Fields of 7 and 10.5 T.Magnetic resonance imaging clinics of North America · 2021Review
- Global optimization of default phases for parallel transmit coils for ultra-high-field cardiac MRI.PloS one · 2021Article
- Cardiac functional magnetic resonance imaging at 7T: Image quality optimization and ultra-high field capabilities.World journal of radiology · 2020Article
- Parallel Transmission for Ultrahigh Field MRI.Topics in magnetic resonance imaging : TMRI · 2019Review
- Evolution of UHF Body Imaging in the Human Torso at 7T: Technology, Applications, and Future Directions.Topics in magnetic resonance imaging : TMRI · 2019Review
- IMPULSE: A scalable algorithm for design of minimum specific absorption rate parallel transmit RF pulses.Magnetic resonance in medicine · 2019Article
- Diaphragm position can be accurately estimated from the scattering of a parallel transmit RF coil at 7 T.Magnetic resonance in medicine · 2018Article
- Motion-robust cardiac B1+ mapping at 3T using interleaved bloch-siegert shifts.Magnetic resonance in medicine · 2017Article
- Extended RF shimming: Sequence-level parallel transmission optimization applied to steady-state free precession MRI of the heart.NMR in biomedicine · 2017Article
- Simultaneous multislice imaging in dynamic cardiac MRI at 7T using parallel transmission.Magnetic resonance in medicine · 2017Article
- Parallel transmission for ultrahigh-field imaging.NMR in biomedicine · 2016Review
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Authors and funding
4 authors.
Funding
Abstract
purposeTwo-spoke parallel transmission (pTX) radiofrequency (RF) pulses have been demonstrated in cardiac MRI at 7T. However, current pulse designs rely on a single set of B1(+)/B0 maps that may not be valid for subsequent scans acquired at another phase of the respiration cycle because of organ displacement. Such mismatches may yield severe excitation profile degradation.
methodsB1(+)/B0 maps were obtained, using 16 transmit channels at 7T, at three breath-hold positions: exhale, half-inhale, and inhale. Standard and robust RF pulses were designed using maps obtained at exhale only, and at multiple respiratory positions, respectively. Excitation patterns were analyzed for all positions using Bloch simulations. Flip-angle homogeneity was compared in vivo in cardiac CINE acquisitions.
resultsStandard one- and two-spoke pTX RF pulses are sensitive to breath-hold position, primarily due to B1(+) alterations, with high dependency on excitation trajectory for two spokes. In vivo excitation inhomogeneity varied from nRMSE = 8.2% (exhale) up to 32.5% (inhale) with the standard design; much more stable results were obtained with the robust design with nRMSE = 9.1% (exhale) and 10.6% (inhale).
conclusionA new pTX RF pulse design robust against respiration induced variations of B1(+)/B0 maps is demonstrated and is expected to have a positive impact on cardiac MRI in breath-hold, free-breathing, and real-time acquisitions.
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