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Magnetic resonance imaging with submillisecond temporal resolution.

Zheng Zhong1,2, Kaibao Sun1, M Muge Karaman1,2

  • 1Center for Magnetic Resonance Research, University of Illinois at Chicago, Chicago, Illinois, USA.

Magnetic Resonance in Medicine
|November 30, 2020
PubMed
Summary

Submillisecond Periodic Event Encoded Dynamic Imaging (SPEEDI) captures dynamic MRI events with unprecedented temporal resolution. This novel technique visualizes fast biological processes, opening new avenues for medical imaging research.

Keywords:
compressed sensingcurrent mappingeddy currentssubmillisecondtemporal resolutionultrafast imaging

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Magnetic Resonance Imaging

Background:

  • Capturing ultrafast, cyclic biological events in real-time using MRI remains a challenge.
  • Existing MRI techniques often lack the necessary temporal resolution to observe dynamic processes at the submillisecond scale.

Purpose of the Study:

  • To introduce and demonstrate the Submillisecond Periodic Event Encoded Dynamic Imaging (SPEEDI) technique for capturing cyclic dynamic events.
  • To achieve submillisecond temporal resolution in MRI for visualizing rapid biological and physical processes.

Main Methods:

  • The SPEEDI technique utilizes FID or echo signals, with each time point sampling a unique k-space raster.
  • Acquisitions are synchronized with cyclic events, generating time-resolved images.
  • Demonstrated using compressed sensing for accelerated acquisition in experiments visualizing electric currents and eddy currents.

Main Results:

  • Successfully obtained time-resolved phase maps for action potential-mimicking currents, showing good agreement with theoretical models (NRMSE = 0.07).
  • Characterized eddy current decay with time constants matching established methods (e.g., 27.1 ± 0.2 ms).
  • Achieved high structural similarity (> 0.8) in phase maps with 2x-3x acceleration using compressed sensing.

Conclusions:

  • The SPEEDI technique successfully provides submillisecond temporal resolution in MRI.
  • This advancement enables the study of ultrafast, cyclic biomedical processes previously inaccessible with MRI.
  • SPEEDI holds significant potential for future research in dynamic biological systems.