ArticlePloS one2018
In-vivo and numerical analysis of the eigenmodes produced by a multi-level Tic-Tac-Toe head transmit array for 7 Tesla MRI.
Article in PloS one, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.
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Who cites it
25 citing papers in PubMed.
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- An open-source stereotaxic container with an integrated cutting guide for human brain fixation during magnetic resonance imaging and sectioning for histology.bioRxiv : the preprint server for biology · 2026Article
- Accelerated brain atrophy in sickle cell anemia despite chronic exchange transfusion therapy-A case report.Radiology case reports · 2026Article
- Investigating Disruptions in Information Flow due to Sickle Cell Disease Using Granger Causality.Human brain mapping · 2025Article
- RF shimming strategy for an open 60-channel RF transmit 7T MRI head coil for routine use on the single transmit mode.Magnetic resonance in medicine · 2025Article
- Independence-based causal discovery analysis reveals statistically non-significant regions to be functionally significant.bioRxiv : the preprint server for biology · 2025Article
- Cross-Modality Image Translation of 3 Tesla Magnetic Resonance Imaging to 7 Tesla Using Generative Adversarial Networks.Human brain mapping · 2025Article
- Correlating hippocampal and amygdala volumes with neuropathological burden in Down syndrome and Alzheimer's disease and related neurodegenerative pathologies using 7T postmortem MRI.Journal of neuropathology and experimental neurology · 2025Article
- Brain Morphometrics Correlations With Age Among 350 Participants Imaged With Both 3T and 7T MRI: 7T Improves Statistical Power and Reduces Required Sample Size.Human brain mapping · 2025Article
- A neuropathology case report of a woman with Down syndrome who remained cognitively stable: Implications for resilience to neuropathology.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2025Article
- Hippocampal vascular supply and its mediating role in systemic physiological influences on hippocampal volume.Frontiers in aging neuroscience · 2025Article
- Measuring arterial tortuosity in the cerebrovascular system using Time-of-Flight MRI.medRxiv : the preprint server for health sciences · 2024Article
- Leveraging ultra-high field (7T) MRI in psychiatric research.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2024Review
- An open-source MRI compatible frame for multimodal presurgical mapping in macaque and capuchin monkeys.Journal of neuroscience methods · 2024Article
- Hippocampal subfields and thalamic nuclei associations with clinical outcomes in multiple sclerosis: An ultrahigh field MRI study.Multiple sclerosis and related disorders · 2024Article
- Manual segmentation of the paraventricular nucleus of the hypothalamus and the dorsal and ventral bed nucleus of stria terminalis using multimodal 7 Tesla structural MRI: probabilistic atlases for a stress-control triad.Brain structure & function · 2024Article
- Characterization of pulsations in the brain and cerebrospinal fluid using ultra-high field magnetic resonance imaging.Frontiers in neuroscience · 2024Article
- Intermittent low-intensity and moderate-intensity exercise effects on cognition in community-dwelling older adults: a pilot study exploring biological mechanisms.Frontiers in aging neuroscience · 2024Article
- Multipronged investigation of morphometry and connectivity of hippocampal network in relation to risk for psychosis using ultrahigh field MRI.Schizophrenia research · 2023Article
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12 authors.
Funding
Abstract
Radio-frequency (RF) field inhomogeneities and higher levels of specific absorption rate (SAR) still present great challenges in ultrahigh-field (UHF) MRI. In this study, an in-depth analysis of the eigenmodes of a 20-channel transmit Tic-Tac-Toe (TTT) RF array for 7T neuro MRI is presented. The eigenmodes were calculated for five different Z levels (along the static magnetic field direction) of the coil. Four eigenmodes were obtained for each Z level (composed of 4 excitation ports), and they were named based on the characteristics of their field distributions: quadrature, opposite-phase, anti-quadrature, and zero-phase. Corresponding finite-difference time-domain (FDTD) simulations were performed and experimental B1+ field maps were acquired using a homogeneous spherical phantom and human head (in-vivo). The quadrature mode is the most efficient and it excites the central brain regions; the opposite-phase mode excites the brain peripheral regions; anti-quadrature mode excites the head periphery; and the zero-phase mode excites cerebellum and temporal lobes. Using this RF array, up to five eigenmodes (from five different Z levels) can be simultaneously excited. The superposition of these modes has the potential to produce homogeneous excitation with full brain coverage and low levels of SAR at 7T MRI.
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