Evidence map›Paper›PMID 34826596›Full record

ArticleNeuroImage2021

Ultra-long-TE arterial spin labeling reveals rapid and brain-wide blood-to-CSF water transport in humans.

Leonie Petitclerc, Lydiane Hirschler, Jack A Wells, David L Thomas, Marianne A A van Walderveen, Mark A van Buchem, Matthias J P van Osch

Open access · goldAbstract read
In one paragraph

Article in NeuroImage, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 45 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
45citing papers in PubMed, 1 pooled it
6.7field-weighted citation impact, top 2% of its field
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

45 citing papers in PubMed, 1 synthesis or guideline pooled it, 80 citations in OpenAlex.

  1. Pooled it
  2. Glymphatic function in humans: indicators, modulators, and measurement strategies.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2026
    Review
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  5. Simultaneous measurement of water transport across the blood-brain and blood-CSF barrier in the human brain with arterial spin labeling MRI.Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism · 2026
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  17. Observational
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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

7 authors at 3 institutions in 2 countries.

Leonie PetitclercC.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands; Leiden Institute for Brain and Cognition (LIBC), Leiden, Netherlands; Department of Radiology, Leiden University Medical Center, Leiden, Netherlands. Electronic address: l.petitclerc@lumc.nl.
Lydiane HirschlerC.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands; Department of Radiology, Leiden University Medical Center, Leiden, Netherlands.
Jack A WellsUCL Centre for Advanced Biomedical Imaging, Division of Medicine, University College London, London, United Kingdom.
David L ThomasNeuroradiological Academic Unit, Department of Brain Repair and Rehabilitation, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom; Dementia Research Centre, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom; Wellcome Centre for Human Neuroimaging, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom.
Marianne A A van WalderveenDepartment of Radiology, Leiden University Medical Center, Leiden, Netherlands.
Mark A van BuchemC.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands; Leiden Institute for Brain and Cognition (LIBC), Leiden, Netherlands; Department of Radiology, Leiden University Medical Center, Leiden, Netherlands.
Matthias J P van OschC.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands; Leiden Institute for Brain and Cognition (LIBC), Leiden, Netherlands; Department of Radiology, Leiden University Medical Center, Leiden, Netherlands.
Leiden University Medical Center · NLNational Hospital for Neurology and Neurosurgery · GBUniversity College London · GB

Funding

Department of HealthWellcome Trust 204624Wellcome Trust 204624/Z/16/Z
6 · The paper itself

Abstract

The study of brain clearance mechanisms is an active area of research. While we know that the cerebrospinal fluid (CSF) plays a central role in one of the main existing clearance pathways, the exact processes for the secretion of CSF and the removal of waste products from tissue are under debate. CSF is thought to be created by the exchange of water and ions from the blood, which is believed to mainly occur in the choroid plexus. This exchange has not been thoroughly studied in vivo. We propose a modified arterial spin labeling (ASL) MRI sequence and image analysis to track blood water as it is transported to the CSF, and to characterize its exchange from blood to CSF. We acquired six pseudo-continuous ASL sequences with varying labeling duration (LD) and post-labeling delay (PLD) and a segmented 3D-GRASE readout with a long echo train (8 echo times (TE)) which allowed separation of the very long-T

Indexed as

AdultBody WaterCerebrospinal FluidCerebrovascular CirculationChoroid PlexusFemaleHumansMagnetic Resonance ImagingMaleMiddle AgedSpin LabelsSubarachnoid SpaceSpin LabelsArterial spin labelingBlood-csf barrierBrain clearanceDynamic compartmental modelingGlymphaticsNeurofluidsWater transport

Identifiers

PMID34826596
PMCPMC7612938
OpenAlexW3217717616

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.