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Overcoming Low-Field Limitations: High-Quality Ex Vivo Soft Tissue Imaging with Compact MRI Systems.

Andrea Litwak1,2,3,4, Andrea Sarabia1,2,3,4, Mikayla Tamboline1,2,3

  • 1Department of Molecular and Medical Pharmacology, University of California Los Angeles, Los Angeles, California.

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|January 2, 2026
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Summary

Researchers optimized low-field magnetic resonance imaging (MRI) protocols for high-quality ex vivo soft tissue imaging. This advancement makes advanced tissue characterization more accessible for disease research and therapeutic development.

Keywords:
ex vivo tissue samplespermanent magnetpreclinical low‐field MRItissue preparation

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Area of Science:

  • Biomedical Imaging
  • Medical Physics

Background:

  • High-field MRI offers superior soft tissue imaging but is limited by cost and infrastructure.
  • Low-field preclinical MRI systems are cost-effective and portable but have lower signal-to-noise ratio (SNR) and limited sequences.
  • Existing limitations hinder high-quality ex vivo soft tissue characterization using low-field MRI.

Purpose of the Study:

  • To develop an optimized imaging protocol for high-quality ex vivo soft tissue imaging using a compact 1-Tesla permanent-magnet MRI system.
  • To overcome the SNR and pulse sequence limitations of low-field MRI for detailed tissue analysis.
  • To provide a practical framework for researchers to enhance low-field MRI capabilities.

Main Methods:

  • Utilized a 1-Tesla compact preclinical MRI system with a 25-mm x 23-mm coil for human and animal soft tissue samples.
  • Optimized a 3D gradient-echo (3D-GRE) sequence by adjusting number of excitations (NEX), repetition time (TR), echo time (TE), and slice thickness.
  • Implemented standardized sample preparation including staining with gadolinium diethylenetriaminepentaacetic acid (Gd-DTPA) and immobilization using Fluorinert or agarose.

Main Results:

  • Optimized protocol significantly improved SNR and image resolution for ex vivo soft tissue imaging.
  • Adjusting NEX, TR, TE, and slice thickness enhanced image quality and tissue contrast.
  • The developed protocol enables high-quality imaging within a 13-hour scan time.

Conclusions:

  • Optimized low-field MRI protocols substantially enhance the performance of compact permanent-magnet systems for ex vivo soft tissue imaging.
  • This approach democratizes access to advanced tissue characterization, supporting disease research and drug development.
  • The established protocols offer a valuable resource for expanding the utility of low-field MRI in research settings.