Super-Resolution Reconstruction for Two- and Three-Dimensional LA-ICP-MS Bioimaging

Anal Chem. 2019 Dec 3;91(23):14879-14886. doi: 10.1021/acs.analchem.9b02380. Epub 2019 Nov 7.

Abstract

The resolution of laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) elemental bioimaging is usually constrained by the diameter of the laser spot size and is often not adequate to explore in situ subcellular distributions of elements and proteins in biological tissue sections. Super-resolution reconstruction is a method typically used for many imaging modalities and combines multiple lower resolution images to create a higher resolution image. Here, we present a super-resolution reconstruction method for LA-ICP-MS imaging by ablating consecutive layers of a biological specimen with offset orthogonal scans, resulting in a 10× improvement in resolution for quantitative measurement of dystrophin in murine muscle fibers. Layer-by-layer image reconstruction was also extended to the third dimension without the requirement of image registration across multiple thin section specimens. Quantitative super-resolution reconstruction, combined with Gaussian filtering and application of the Richardson-Lucy total variation algorithm, provided superior image clarity and fidelity in two- and three-dimensions.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algorithms*
  • Animals
  • Dystrophin / genetics*
  • Gene Expression
  • Image Processing, Computer-Assisted / methods
  • Imaging, Three-Dimensional / statistics & numerical data*
  • Laser Therapy
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Microtomy
  • Muscle Fibers, Skeletal / metabolism
  • Muscle Fibers, Skeletal / ultrastructure
  • Quadriceps Muscle / diagnostic imaging*
  • Quadriceps Muscle / metabolism
  • Quadriceps Muscle / ultrastructure
  • Spectrophotometry, Atomic / methods*

Substances

  • Dystrophin