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Updated: Jan 31, 2026
09:14
Cardiac Magnetic Resonance Imaging at 7 Tesla
Published on: January 6, 2019
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Next Generation 7 Tesla Arterial Spin Labeling With Rotated Spiral Acquisition Enables Mesoscale Resolution in 3D
Chenyang Zhao1, Fanhua Guo1, Zidong Yang1
1Laboratory of FMRI Technology (LOFT), Mark & Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
Magnetic Resonance in Medicine
|January 29, 2026
Summary
High-resolution whole-brain perfusion imaging at 7 Tesla was achieved using advanced ASL techniques. This noninvasive method bridges MRI and cellular imaging, revealing detailed neural activity.
Area of Science:
- Neuroimaging
- Magnetic Resonance Imaging (MRI)
- Physiology
Background:
- Advanced Magnetic Resonance Imaging (MRI) techniques are crucial for understanding brain function at high resolution.
- Arterial Spin Labeling (ASL) offers noninvasive perfusion quantification but faces resolution limitations.
Purpose of the Study:
- To develop and validate a high-resolution (≤1mm isotropic) whole-brain perfusion imaging technique at 7 Tesla.
- To leverage next-generation ASL pulse sequences, reconstruction algorithms, and MRI hardware for improved imaging performance.
Main Methods:
- Utilized a FLASH-based pseudo-Continuous ASL (pCASL) sequence with rotated golden-angle stack-of-spirals (rGA-SoS) sampling.
- Employed dynamic compressed sensing (CS) reconstruction with motion-resolved self-navigation for enhanced spatiotemporal resolution.
- Integrated a high-density array coil and high-performance Impulse gradient on a NexGen 7T scanner.
Main Results:
- Achieved 0.8mm isotropic spatial resolution and 14s temporal resolution at 1mm isotropic, with a 3.3-fold SNR increase.
- Demonstrated strong correlations between resting-state perfusion and histological microvascular/cell body density.
- Observed distinct laminar activation patterns in motor cortex during finger-tapping and working memory tasks.
Conclusions:
- The developed method provides a noninvasive tool to bridge mesoscopic MRI with microscopic cellular imaging.
- Enables investigation of neural excitation and inhibition underlying positive and negative fMRI activations.
- Advances the capability for detailed study of brain function and structure at unprecedented resolution.
Keywords:
BigBrain atlasNexGen 7 Tarterial spin labeling (ASL)layer fMRImicroscopic imagingultrahigh‐field MRIworking memoryMore Related Videos
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