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Related Experiment Videos

Tracers in vascular casting resins enhance backscattering brightness.

Dean E Schraufnagel1, Dhanalakshmi P Ganesan

  • 1Department of Medicine, University of Illinois at Chicago, 60612-7323, USA. schrauf@uic.edu

Scanning
|June 21, 2002
PubMed
Summary

Researchers explored using heavy element tracers in scanning electron microscopy casts to identify blood flow sources in complex vascular networks. While some tracers improved cast contrast, an optimal solution for distinguishing dual circulations remains elusive.

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Area of Science:

  • Microvascular research
  • Scanning electron microscopy (SEM)
  • Biomedical imaging

Background:

  • Scanning electron microscopy (SEM) of microvascular casts enhances understanding of circulatory systems.
  • Distinguishing blood supply from dual-origin vascular beds requires specialized techniques.
  • Heavy element tracers offer potential for differentiating substances via backscattered electron detection in SEM.

Purpose of the Study:

  • To evaluate various heavy element compounds as tracers in methyl methacrylate casting resin for SEM.
  • To assess the impact of tracers on cast properties like shrinkage, hardness, and quality.
  • To determine the effectiveness of tracers in enhancing contrast for distinguishing vascular sources.

Main Methods:

  • Tested lead, titanium, iron, osmium, and uranium compounds as tracers in methyl methacrylate resin.

Related Experiment Videos

  • Analyzed tracer effects on resin solidification, shrinkage, and hardness using multivariate analysis.
  • Evaluated cast quality and brightness changes under SEM at different working distances and specimen coatings.
  • Correlated brightness with atomic number, tracer concentration, and specimen composition.

    • Main Results:

    • Several tracer concentrations led to sedimentation and prevented resin solidification.
    • Tetraethyl lead shortened hardening time; uranyl acetate and osmium tetroxide prolonged it.
    • Most tracers reduced cast shrinkage.
    • Increased brightness correlated with higher atomic number, tracer concentration, and specimen atomic number (p <0.0001).
    • Tetraethyl lead and uranium provided the greatest contrast enhancement.

    Conclusions:

    • Backscattered electron detection can differentiate methacrylate casts with added heavy elements.
    • Heavy element tracers show promise for SEM-based microvascular studies.
    • An optimal tracer for distinguishing dual vascular supplies has not yet been identified.