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Related Concept Videos

Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Author Spotlight: Noninvasive Cerebral Blood Flow Determination in Human Functional Brain Region for Diagnosis of Neurological Disorders
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A CSF Background Suppression Scheme in Arterial Spin Labeling MRI.

Zhiyi Hu1,2, Wen Shi1,2, Yifan Gou1,2

  • 1Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA.

NMR in Biomedicine
|November 29, 2025
PubMed
Summary

Suppressing cerebrospinal fluid (CSF) signal in arterial spin labeling (ASL) MRI significantly improves image quality. This new CSF background suppression (BS) method reduces artifacts and enhances the accuracy of cerebral blood flow (CBF) and arterial transit time (ATT) measurements.

Keywords:
arterial spin labelingarterial transit timebackground suppressioncerebral blood flowmulti‐delay ASL

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)
  • Physiology

Background:

  • Arterial spin labeling (ASL) MRI is limited by low signal-to-noise ratio.
  • Current background suppression (BS) techniques primarily target tissue signal, potentially overlooking cerebrospinal fluid (CSF) contributions.
  • Pulsation of CSF within the neurofluid circulation may introduce artifacts in ASL MRI.

Purpose of the Study:

  • To investigate the hypothesis that BS schemes targeting CSF signal suppression can yield greater benefits than tissue-focused methods.
  • To develop and evaluate a novel CSF BS scheme for pseudo-continuous ASL (pCASL) MRI.
  • To compare the performance of CSF BS against conventional regular and enhanced BS methods.

Main Methods:

  • Development of a two-inversion pulse CSF BS scheme designed for maximal CSF signal suppression.
  • Evaluation of the CSF BS scheme in single-delay and multi-delay pCASL MRI sequences.
  • Comparison of CSF BS with regular and enhanced BS (tissue-focused) in terms of artifact reduction and reproducibility (voxel-wise CoV, spatial Spearman correlation).

Main Results:

  • The CSF BS scheme effectively suppressed CSF signals to <1% of equilibrium magnetization.
  • CSF BS significantly reduced visually apparent hyper- and hypo-intensity artifacts in cerebral blood flow (CBF) maps, particularly in brain-stem regions.
  • CSF BS demonstrated superior quantitative performance, yielding lower CoV (8.8%) and higher Rs (0.89) for CBF maps compared to tissue-focused BS (CoV 18.8%, Rs 0.64).
  • In multi-delay pCASL, CSF BS achieved lower CoV for both CBF (5.9%) and arterial transit time (ATT) (11.3%) maps.

Conclusions:

  • Cerebrospinal fluid (CSF) background suppression is a highly effective strategy for reducing spurious signals in ASL perfusion MRI.
  • The developed CSF BS scheme significantly improves image quality and quantitative accuracy of CBF and ATT measurements.
  • This technique offers a valuable advancement for ASL MRI applications requiring high-fidelity perfusion quantification.