Evidence map›Paper›PMID 28833542›Full record

ArticleMagnetic resonance in medicine2018

Echo-planar spectroscopic imaging with dual-readout alternated gradients (DRAG-EPSI) at 7 T: Application for 2-hydroxyglutarate imaging in glioma patients.

Zhongxu An, Vivek Tiwari, Sandeep K Ganji, Jeannie Baxter, Michael Levy, Marco C Pinho, Edward Pan, Elizabeth A Maher, Toral R Patel, Bruce E Mickey and 1 more

Abstract read
In one paragraph

Article in Magnetic resonance in medicine, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed, 3 pooled it
–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

20 citing papers in PubMed, 3 syntheses or guidelines pooled it.

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  16. In vivo 2-hydroxyglutarate-proton magnetic resonance spectroscopy (3 T, PRESS technique) in treatment-naïve suspect lower-grade gliomas: feasibility and accuracy in a clinical setting.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2020
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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

11 authors.

Zhongxu AnAdvanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA.ORCID 0000-0003-3759-5645
Vivek TiwariAdvanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Sandeep K GanjiAdvanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Jeannie BaxterAdvanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Michael LevyDepartment of Neurological Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Marco C PinhoAdvanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Edward PanDepartment of Neurological Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Elizabeth A MaherDepartment of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Toral R PatelDepartment of Neurological Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Bruce E MickeyDepartment of Neurological Surgery, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Changho ChoiAdvanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Funding

Clinical development of cancer-specific MRS biomarkers in malignant gliomasR01CA184584 · NCI · UT SOUTHWESTERN MEDICAL CENTER · PI CHOI, CHANGHO · 2014 to 2018
$1.6M
NCI NIH HHS R01 CA184584
6 · The paper itself

Abstract

purposeTo develop echo-planar spectroscopic imaging (EPSI) with large spectral width and accomplish high-resolution imaging of 2-hydroxyglutarate (2HG) at 7 T.

methodsWe designed a new EPSI readout scheme at 7 T. Data were recorded with dual-readout alternated gradients and combined according to the gradient polarity. Following validation of its performance in phantoms, the new readout scheme, together with previously reported 2HG-optimized magnetic resonance spectroscopy (point-resolved spectroscopy echo time of 78 ms), was used for time-efficient and high-resolution imaging of 2HG and other metabolites in five glioma patients before treatment. Unsuppressed water, acquired with EPSI, was used as reference for multichannel combination, eddy-current compensation, and metabolite quantification. Spectral fitting was conducted with the LCModel using in-house calculated basis sets.

resultsUsing a readout gradient strength of 9.5 mT/m and slew rate of 90 mT/m/ms, dual-readout alternated gradients EPSI permitted 1638-Hz spectral width with 6 × 6 mm

conclusionsThe data indicated that the dual-readout alternated gradients EPSI can provide reliable high-resolution imaging of 2HG in glioma patients at 7 T in vivo. Magn Reson Med 79:1851-1861, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

Indexed as

AdultBiomarkersBrain NeoplasmsEcho-Planar ImagingFemaleGliomaGlutaratesHumansImage Processing, Computer-AssistedIsocitrate DehydrogenaseMagnetic Resonance SpectroscopyMaleMiddle AgedMutationOligodendrogliomaPhantoms, Imagingalpha-hydroxyglutarateBiomarkersGlutaratesIsocitrate Dehydrogenase1H MRS2-hydroxyglutarate (2HG)7Tdual-readout alternated-gradients EPSI (DRAG-EPSI)echo-planar spectroscopy imaging (EPSI)gliomahuman brain tumor

Identifiers

PMID28833542
PMCPMC5811378

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Registered trials

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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.