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Optogenetic Functional MRI
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Rapid RASER MRI.

Sören Lehmkuhl1, Simon Fleischer1, Jing Yang1

  • 1Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Karlsruhe, Germany.

Angewandte Chemie (International Ed. in English)
|January 29, 2026
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate rapid Magnetic Resonance Imaging (MRI) using Radiofrequency Amplification by Stimulated Emission of Radiation (RASER) without high-power radiofrequency pulses. This novel technique enables faster, safer MRI scans, ideal for portable and hyperpolarized imaging applications.

Keywords:
HyperpolarizationMRINMR spectroscopyParahydrogenRASER

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Medical Physics

Background:

  • Conventional MRI uses high-power radiofrequency (RF) pulses for nuclear spin excitation, causing tissue heating and requiring bulky amplifiers.
  • Increasing MRI field strength exacerbates safety concerns and equipment demands.
  • An alternative, self-excitation via Radiofrequency Amplification by Stimulated Emission of Radiation (RASER), bypasses RF pulses.

Purpose of the Study:

  • To demonstrate the feasibility of RASER-based MRI for rapid imaging.
  • To assess the performance of RASER MRI at high field strengths and low concentrations.
  • To explore the potential of RASER MRI for dynamic imaging and portable applications.

Main Methods:

  • Proton RASER MRI was performed on pyrazine solutions at 500 MHz (11.7 T).
  • Imaging parameters included a 128x128 matrix size, achieving acquisition times as low as 78 ms.
  • Time-series imaging was conducted using a single bolus of hyperpolarized pyrazine.

Main Results:

  • Rapid proton RASER MRI images of pyrazine (120 mM) were successfully acquired with a 128x128 matrix in 78 ms.
  • The study demonstrated the capability for dynamic tracking of hyperpolarized pyrazine.
  • The method eliminates the need for transmit-receive MRI scanner electronics.

Conclusions:

  • RASER MRI offers a viable alternative to conventional RF-pulse excitation, enabling faster and potentially safer MRI.
  • This technique is highly suitable for portable MRI systems.
  • RASER MRI is promising for advanced applications like hyperpolarized MRI using various tracers.