ArticleMagnetic resonance in medicine2024
Comparison of tight-fitting 7T parallel-transmit head array designs using excitation uniformity and local specific absorption rate metrics.
Article in Magnetic resonance in medicine, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed.
- Evaluation of 7 Tesla pTx Body Coils Regarding Transmit and Receive Performance.Magnetic resonance in medicine · 2026Article
- Time-Division Multiplexing for Parallel Transmission at Ultra-High Field With Limited RF Channels.Magnetic resonance in medicine · 2026Article
- Simulated radiation levels and patterns of MRI without a Faraday shielded room.Magnetic resonance in medicine · 2025Article
- Control of radiated emissions during MRI using parallel transmit: a path to eliminating the Faraday shielded room for 0.5T imaging.Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2025Article
- Enhancing fine-tuning efficiency and design optimization of an eight-channel 3T transmit array via equivalent circuit modeling and Eigenmode analysis.Medical physics · 2025Article
- High-resolution quantitative TImaging neuroscience (Cambridge, Mass.) · 2025Article
- Dual birdcage coils to control radiation from MRI systems operated without a Faraday cage.Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2024Article
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Authors and funding
3 authors.
Funding
Abstract
purposeWe model the performance of parallel transmission (pTx) arrays with 8, 16, 24, and 32 channels and varying loop sizes built on a close-fitting helmet for brain imaging at 7 T and compare their local specific absorption rate (SAR) and flip-angle performances to that of birdcage coil (used as a baseline) and cylindrical 8-channel and 16-channel pTx coils (single-row and dual-row).
methodsWe use the co-simulation approach along with MATLAB scripting for batch-mode simulation of the coils. For each coil, we extracted B
resultsHelmet designs outperformed cylindrical pTx arrays at a constant number of channels in the flip-angle uniformity at a constant local SAR metric: up to 29% for 8-channel arrays, and up to 34% for 16-channel arrays, depending on the slice orientation. For all helmet arrays, increasing the loop diameter led to better local SAR versus flip-angle uniformity tradeoffs, although this effect was more pronounced for the 8-channel and 16-channel systems than the 24-channel and 32-channel systems, as the former have more limited degrees of freedom and therefore benefit more from loop-size optimization.
conclusionHelmet pTx arrays significantly outperformed cylindrical arrays with the same number of channels in local SAR and flip-angle uniformity metrics. This improvement was especially pronounced for non-transverse slice excitations. Loop diameter optimization for helmets appears to favor large loops, compatible with nearest-neighbor decoupling by overlap.
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