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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
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Cardiac Magnetic Resonance Imaging at 7 Tesla
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Whole-brain snapshot CEST imaging at 7 T using 3D-EPI.

Suzan Akbey1, Philipp Ehses1, Rüdiger Stirnberg1

  • 1German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany.

Magnetic Resonance in Medicine
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A new Chemical Exchange Saturation Transfer (CEST) sequence enables fast, whole-brain imaging at 7 Tesla. This robust method provides 2 mm isotropic resolution within a 16-minute scan, improving diagnostic capabilities.

Keywords:
3D-EPIAPTCESTUHFchemical exchange saturation transferrNOEwhole brain

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Neuroimaging

Background:

  • Chemical Exchange Saturation Transfer (CEST) MRI is a valuable technique for assessing tissue properties.
  • Traditional CEST sequences can be time-consuming, limiting whole-brain coverage.
  • Developing faster and more robust CEST protocols is crucial for clinical applications.

Purpose of the Study:

  • To develop a rapid and robust Chemical Exchange Saturation Transfer (CEST) sequence for whole-brain imaging.
  • To achieve snapshot acquisition of a complete imaging volume after a single preparation block.
  • To enable accurate CEST quantification across the entire brain.

Main Methods:

  • A 3D-CEST sequence with an optimized 3D-EPI readout was developed.
  • Whole-brain Z-spectrum mapping with 2 mm isotropic resolution was acquired at 68 saturation frequencies.
  • Analysis of B1 distribution was performed to optimize B1 correction for accurate CEST quantification.

Main Results:

  • The sequence achieved whole-brain CEST mapping with 2 mm isotropic resolution in 5 minutes for a single offset.
  • B1 distribution analysis indicated that 3 B1 sampling points are sufficient for compensating B1 variations in most brain regions.
  • Quantification in the cerebellum and temporal lobes at 7 Tesla was challenging due to low B1 achieved in these areas.

Conclusions:

  • The developed sequence enables robust acquisition of whole-brain CEST maps with 2 mm isotropic resolution at 7 Tesla.
  • The total scan time for whole-brain imaging was reduced to 16 minutes.
  • The findings support the potential of this sequence for efficient neuroimaging applications.