Evidence map›Paper›PMID 35842192›Full record

ArticleMagnetic resonance imaging2022

Bench to bore ramifications of inter-subject head differences on RF shimming and specific absorption rates at 7T.

Benjamin M Hardy, Rana Banik, Xinqiang Yan, Adam W Anderson

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Magnetic resonance imaging, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Benjamin M HardyVanderbilt University Institute of Imaging Science, 1161 21st Avenue South, Nashville, TN 37232, USA; Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Science Center, Nashville, TN 37232, USA. Electronic address: benjamin.m.hardy@vanderbilt.edu.
Rana BanikVanderbilt University Institute of Imaging Science, 1161 21st Avenue South, Nashville, TN 37232, USA; Department of Biomedical Engineering, Vanderbilt University, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235, USA. Electronic address: rana.banik@vanderbilt.edu.
Xinqiang YanVanderbilt University Institute of Imaging Science, 1161 21st Avenue South, Nashville, TN 37232, USA; Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Medical Center North, 1161 21st Ave. South, Nashville, TN 37232, USA. Electronic address: xinqiang.yan@vanderbilt.edu.
Adam W AndersonVanderbilt University Institute of Imaging Science, 1161 21st Avenue South, Nashville, TN 37232, USA; Department of Biomedical Engineering, Vanderbilt University, PMB 351631, 2301 Vanderbilt Place, Nashville, TN 37235, USA; Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Medical Center North, 1161 21st Ave. South, Nashville, TN 37232, USA. Electronic address: adam.anderson@vanderbilt.edu.

Funding

Computer-Assited Functional NeurosurgeryR01NS095291 · NINDS · VANDERBILT UNIVERSITY · PI DAWANT, BENOIT M., DHAESE, PIERRE F. · 2015 to 2018
$2.4M
Improved High Field MRI Using Internal Traveling Wave SynthesisR21EB024311 · NIBIB · VANDERBILT UNIVERSITY · PI ANDERSON, ADAM W · 2018 to 2019
$546k
NIBIB NIH HHS R21 EB024311NINDS NIH HHS R01 NS095291
6 · The paper itself

Abstract

purposeThis study shows how inter-subject variation over a dataset of 72 head models results in specific absorption rate (SAR) and B

methodsMR-CT datasets were used to segment 71 head models into 10 tissue compartments. These head models were affixed to the shoulders and neck of the virtual family Duke model and placed within an 8 channel transmit surface-loop array to simulate the electromagnetic fields of a 7T imaging experiment. Radio frequency (RF) shimming using the Gerchberg-Saxton algorithm and Circularly Polarized shim weights over the entire brain and select slices of each model was simulated. Various SAR metrics and B

resultsWith varying head geometries the loading for each transmit loop changes as evidenced by changes in S-parameters. The varying shim conditions and head geometries are shown to affect excitation uniformity, spatial distributions of local SAR, and SAR averaging over different pulse sequences. The Gerchberg-Saxton RF shimming algorithm outperforms circularly polarized shimming for all head models. Peak local SAR within the coil most often occurs nearest the coil on the periphery of the body. Shim conditions vary the spatial distribution of SAR.

conclusionThe work gives further support to the need for fast and more subject specific SAR calculations to maintain safety. Local SAR

Indexed as

Magnetic Resonance ImagingRadio WavesAlgorithmsBrainPhantoms, ImagingHead segmentationInter-subject differencesMRI safetyRF coilsRF shimmingSAR

Identifiers

PMID35842192
PMCPMC9376015

What OpenQuestion holds

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Registered trials

None linked

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.