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Related Experiment Video

Updated: Jul 23, 2025

3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography
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Dehydration as alternative sample preparation for soft X-ray tomography.

Anthoula Chatzimpinou1, Charlotta Funaya2, David Rogers3

  • 1Centre for Organismal Studies (COS), Heidelberg University, Heidelberg, Germany.

Journal of Microscopy
|July 11, 2023
PubMed
Summary

Soft X-ray tomography (SXT) can image cells without freezing using critical point drying (CPD). CPD-prepared cells offer ultrastructural detail comparable to cryopreserved samples, making SXT accessible without cryogenic equipment.

Keywords:
X-ray absorptioncell anatomydehydrationtomography

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Area of Science:

  • Cell biology
  • Microscopy
  • Biophysics

Background:

  • Soft X-ray tomography (SXT) enables high-resolution imaging of whole cells in near-native states.
  • Current SXT protocols require cryopreservation, limiting accessibility due to specialized equipment needs.
  • Alternative sample preparation methods are sought to broaden SXT applicability.

Purpose of the Study:

  • To investigate the feasibility of SXT imaging on dehydrated cell specimens.
  • To compare different dehydration techniques for ultrastructural preservation and shrinkage.
  • To establish critical point drying (CPD) as a viable SXT sample preparation method.

Main Methods:

  • Comparison of various dehydration processes (including critical point drying and air-drying) on mouse embryonic fibroblasts.
  • Evaluation of ultrastructural preservation and cellular shrinkage post-dehydration.
  • Soft X-ray tomography imaging of cryopreserved, air-dried, and CPD-dried cells.
  • Analysis of X-ray absorption and 3D anatomical segmentation of dehydrated cells.

Main Results:

  • Critical point drying (CPD) demonstrated superior ultrastructural preservation compared to air-drying.
  • CPD-dried cells exhibited high structural integrity, with minimal shrinkage.
  • While CPD-dried cells showed increased X-ray absorption (3-7x) for organelles, the differential absorption was maintained.
  • 3D anatomy of CPD-dried cells could be successfully segmented and analyzed.

Conclusions:

  • Dehydration, specifically critical point drying (CPD), is a viable alternative sample preparation method for Soft X-ray tomography (SXT).
  • CPD allows for ultrastructural visualization of cells using SXT without the need for cryopreservation.
  • This approach expands the accessibility of SXT imaging to laboratories lacking cryogenic infrastructure.