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Related Experiment Video

Updated: Jan 20, 2026

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Optimizing ultra-rapid compressed-sensing MPRAGE acquisitions for brain morphometry.

Lindsay C Hanford1,2,3, Tom Hilbert4,5,6, Tobias Kober4,5,6

  • 1Center for Brain Science, Harvard University, Cambridge, MA, United States.

Frontiers in Neuroimaging
|January 19, 2026
PubMed
Summary
This summary is machine-generated.

Compressed-sensing (CS) MRI significantly reduces scan times for T1-weighted brain imaging. Accelerated CS protocols demonstrate comparable morphometric accuracy to traditional methods, enhancing efficiency and reducing artifacts.

Keywords:
T1 weightedbrain morphometrycompressed sensingmagnetization prepared rapid acquisition gradient echorapid MRI methods

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Area of Science:

  • Neuroimaging
  • Radiology
  • Medical Physics

Background:

  • Compressed-sensing (CS) MRI enables rapid acquisition of T1-weighted (T1w) structural images, reducing scan times to 1-2 minutes.
  • Fast MRI acquisitions minimize participant burden, decrease motion artifacts, and allow for repeat scans within a single session.

Purpose of the Study:

  • Investigate the trade-offs between sparse sampling and CS image reconstruction for brain morphometric analysis.
  • Evaluate the impact of acceleration and regularization factors on T1w MRI morphometry.

Main Methods:

  • Acquired Magnetization-Prepared Rapid Gradient Echo (MPRAGE) images at 1.0 mm resolution.
  • Examined acceleration factors (x2-x8) and regularization parameters.
  • Assessed subcortical volumes and regional cortical thickness, evaluating within- and between-sequence agreement.

Main Results:

  • Higher acceleration reduced white matter SNR but not gray matter SNR; regularization parameter offered further SNR manipulation.
  • Within-sequence agreement was comparable across all CS protocols, including the highly accelerated CSx8 (58s).
  • High agreement was observed between fully sampled and under-sampled protocols up to 8x acceleration; regularization minimally impacted morphometric agreement.

Conclusions:

  • Accelerated CS MRI protocols achieve performance comparable to traditional, longer MRI protocols for morphometric brain estimates.
  • CS-based T1w imaging offers a viable alternative for efficient and accurate brain morphometry.