ArticleMagnetic resonance in medicine2016
Radiofrequency energy deposition and radiofrequency power requirements in parallel transmission with increasing distance from the coil to the sample.
Article in Magnetic resonance in medicine, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
12 citing papers in PubMed, 25 citations in OpenAlex.
- Deep learning-based whole-brain BMagnetic resonance in medicine · 2025Article
- Actual patient position versus safety models: Specific Absorption Rate implications of initial head position for Ultrahigh Field Magnetic Resonance Imaging.NMR in biomedicine · 2023Article
- Quantitative sensory testing in a magnetic resonance environment: considerations for thermal sensitivity and patient safety.Frontiers in pain research (Lausanne, Switzerland) · 2023Article
- Bench to bore ramifications of inter-subject head differences on RF shimming and specific absorption rates at 7T.Magnetic resonance imaging · 2022Article
- Rigid motion-resolvedMagnetic resonance in medicine · 2022Article
- Local SAR compression with overestimation control to reduce maximum relative SAR overestimation and improve multi-channel RF array performance.Magma (New York, N.Y.) · 2021Article
- Specific absorption rate implications of within-scan patient head motion for ultra-high field MRI.Magnetic resonance in medicine · 2020Article
- Over-overlapped loop arrays: A numerical study.Magnetic resonance imaging · 2020Article
- Parallel Transmission for Ultrahigh Field MRI.Topics in magnetic resonance imaging : TMRI · 2019Review
- New resonator geometries for ICE decoupling of loop arrays.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2017Article
- Measurements of RF power reflected and radiated by multichannel transmit MR coils at 7T.Magma (New York, N.Y.) · 2016Article
- Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
purposeWe investigated global specific absorption rate (SAR) and radiofrequency (RF) power requirements in parallel transmission as the distance between the transmit coils and the sample was increased.
methodsWe calculated ultimate intrinsic SAR (UISAR), which depends on object geometry and electrical properties but not on coil design, and we used it as the reference to compare the performance of various transmit arrays. We investigated the case of fixing coil size and increasing the number of coils while moving the array away from the sample, as well as the case of fixing coil number and scaling coil dimensions. We also investigated RF power requirements as a function of lift-off, and tracked local SAR distributions associated with global SAR optima.
resultsIn all cases, the target excitation profile was achieved and global SAR (as well as associated maximum local SAR) decreased with lift-off, approaching UISAR, which was constant for all lift-offs. We observed a lift-off value that optimizes the balance between global SAR and power losses in coil conductors. We showed that, using parallel transmission, global SAR can decrease at ultra high fields for finite arrays with a sufficient number of transmit elements.
conclusionFor parallel transmission, the distance between coils and object can be optimized to reduce SAR and minimize RF power requirements associated with homogeneous excitation.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.