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Integrating Ion Beam Control into a Commercial Platform for Improved Multimodal SIMS/MALDI Imaging.

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This study enhances multimodal mass spectrometry imaging (MSI) by integrating a C60 ion gun for improved spatial resolution and sensitivity. The new platform enables seamless data acquisition and coregistration for advanced chemical analysis in biological research.

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Area of Science:

  • Analytical Chemistry
  • Biomedical Imaging
  • Materials Science

Background:

  • Mass spectrometry imaging (MSI) is crucial for spatially resolved chemical analysis in biological and biomedical fields.
  • Multimodal MSI combines techniques like secondary ion mass spectrometry (SIMS) and matrix-assisted laser desorption/ionization (MALDI) for comprehensive analysis.
  • Acquiring multimodal MSI data from separate instruments presents challenges in image coregistration and sample integrity.

Purpose of the Study:

  • To enhance a single-platform MSI instrument by implementing field of view (FoV) mode SIMS.
  • To improve spatial resolution and sensitivity in multimodal MSI.
  • To facilitate high-spatial-resolution image coregistration with other imaging modalities.

Main Methods:

  • Integrated a C60 ion gun into a commercial MSI instrument for SIMS, MALDI, and secondary electron imaging.
  • Implemented FoV mode SIMS with ion beam rastering for enhanced spatial resolution.
  • Optimized elemental ion signals using collision-induced dissociation (CID) and utilized secondary electrons for MALDI laser assessment.

Main Results:

  • Achieved a spatial resolution of 2 μm in FoV mode SIMS, surpassing sample stage resolution.
  • Demonstrated enhanced sensitivity for selected species via CID.
  • Successfully etched fiducial markers for optical image coregistration and assessed MALDI laser settings using secondary electrons.

Conclusions:

  • The developed single-platform MSI instrument offers improved spatial resolution and sensitivity for multimodal analysis.
  • The integration facilitates seamless data acquisition and coregistration, overcoming limitations of separate instrument approaches.
  • This advancement provides a more robust and efficient tool for chemical imaging in life sciences and beyond.