Evidence map›Paper›PMID 27599782›Full record

ArticleMagnetic resonance in medicine2017

Motion-robust cardiac B1+ mapping at 3T using interleaved bloch-siegert shifts.

Sebastian Weingärtner, Fabian Zimmer, Gregory J Metzger, Kâmil Uğurbil, Pierre-Francois Van de Moortele, Mehmet Akçakaya

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Magnetic resonance in medicine, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing 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

9 citing papers in PubMed.

  1. Article
  2. Article
  3. Robust cardiacMagnetic resonance in medicine · 2023
    Article
  4. Rapid 3D absolute BMagnetic resonance in medicine · 2023
    Article
  5. Free-breathing abdominal TNMR in biomedicine · 2021
    Article
  6. Article
  7. Robust 3D Bloch-Siegert basedMagnetic resonance in medicine · 2019
    Article
  8. Ultrafast 3D Bloch-Siegert BMagnetic resonance in medicine · 2019
    Article
  9. 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

6 authors.

Sebastian WeingärtnerElectrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota, USA.
Fabian ZimmerComputer Assisted Clinical Medicine, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.
Gregory J MetzgerCenter for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
Kâmil UğurbilCenter for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
Pierre-Francois Van de MoorteleCenter for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA.
Mehmet AkçakayaElectrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota, USA.

Funding

NMR Imaging and SpectroscopyP41EB015894 · NIBIB · UNIVERSITY OF MINNESOTA · PI UGURBIL, KAMIL · 2012 to 2017
$8.4M
Novel Accelerated Contrast-Enhanced High Resolution Coronary MRIR00HL111410 · NHLBI · UNIVERSITY OF MINNESOTA · PI AKCAKAYA, MEHMET · 2015 to 2017
$746k
NHLBI NIH HHS R00 HL111410NIBIB NIH HHS P41 EB015894
6 · The paper itself

Abstract

purposeTo develop and evaluate a robust motion-insensitive Bloch-Siegert shift based B1+ mapping method in the heart.

methodsCardiac Bloch-Siegert B1+ mapping was performed with interleaved positive and negative off-resonance shifts and diastolic spoiled gradient echo imaging in 12 heartbeats. Numerical simulations were performed to study the impact of respiratory motion. The method was compared with three-dimensional (3D) actual flip angle imaging (AFI) and two-dimensional (2D) saturated double angle method (SDAM) in phantom scans. Cardiac B1+ maps of three different views were acquired in six healthy volunteers using Bloch-Siegert and SDAM during breath-hold and free breathing. In vivo maps were evaluated for inter-view consistency using the correlation coefficients of the B1+ profiles along the lines of intersection between the views.

resultsFor the Bloch-Siegert sequence, numerical simulations indicated high similarity between breath-hold and free breathing scans, and phantom results indicated low deviation from the 3D AFI reference (normalized root mean square error [NRMSE] = 2.0%). Increased deviation was observed with 2D SDAM (NRMSE = 5.0%) due to underestimation caused by imperfect excitation slice profiles. Breath-hold and free breathing Bloch-Siegert in vivo B1+ maps were visually comparable with no significant difference in the inter-view consistency (P > 0.36). SDAM showed strongly impaired B1+ map quality during free breathing. Inter-view consistency was significantly lower than with the Bloch-Siegert method (breath-hold: P = 0.014, free breathing: P < 0.0001).

conclusionThe proposed interleaved Bloch-Siegert sequence enables cardiac B1+ mapping with improved inter-view consistency and high resilience to respiratory motion. Magn Reson Med 78:670-677, 2017. © 2016 International Society for Magnetic Resonance in Medicine.

Indexed as

AdolescentAdultCardiac Imaging TechniquesComputer SimulationFemaleHumansImage Processing, Computer-AssistedMagnetic Resonance ImagingMaleMiddle AgedPhantoms, ImagingYoung Adultabdominal imagingB1+ mapping; Bloch-Siegert shift; motion robustnesscardiac imaging

Identifiers

PMID27599782
PMCPMC5340643

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

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.