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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Related Experiment Video

Updated: Jan 8, 2026

Microfocus X-ray CT microCT Imaging of Actinia equina Cnidaria, Harmothoe sp. Annelida, and Xenoturbella japonica Xenacoelomorpha
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Optimizing Computed Tomography (CT) for Structurally Complex Organisms: A Case Study of Gastropod Shell Features.

Andreza Caroline Caiero1, Marilia Nagata Ragagnin1, Cláudio Campi de Castro2

  • 1Biological Oceanography Department, Oceanographic Institute University of São Paulo São Paulo Brazil.

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|December 22, 2025
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Summary

An optimized computed tomography (OCT) protocol offers a reliable, nondestructive method for estimating gastropod shell volume, crucial for hermit crab ecology studies. This new OCT method provides accurate measurements comparable to traditional techniques across various shell types.

Keywords:
ArtifactHermit crabImaging techniqueShellTomography

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Area of Science:

  • Ecology
  • Zoology
  • Biotechnology

Background:

  • Gastropod shell volume is critical for hermit crab ecology, influencing shell selection and resource competition.
  • Traditional methods for shell volume estimation (water/sand displacement) are destructive and time-consuming.
  • Computed tomography (CT) offers a non-destructive alternative, but optimization is needed for accurate volume assessment.

Purpose of the Study:

  • To develop and validate an optimized computed tomography (OCT) protocol for estimating internal gastropod shell volume.
  • To compare OCT-derived volumes with traditional water/sand displacement methods and a non-optimized CT protocol (NOCT).
  • To evaluate the performance of different software (CT Viewer vs. OsiriX MD) for CT data analysis.

Main Methods:

  • Gastropod shells of varying species, sizes, and architectures were analyzed using CT scanning.
  • Volume estimations from the optimized CT protocol (OCT) were compared against NOCT and water/sand displacement methods.
  • Software performance (CT Viewer and OsiriX MD) was assessed for accuracy and reproducibility.

Main Results:

  • OCT provided volume estimates comparable to NOCT for high-spired shells and those with surface elevations.
  • For low- and middle-spired shells, OCT yielded higher volumes, aligning with sand-filling results.
  • OsiriX MD demonstrated high accuracy and reproducibility, comparable to OCT for most species.
  • Shell size impacted volume estimation variability, with larger high-spired shells showing greater variation.

Conclusions:

  • The optimized computed tomography (OCT) protocol is a reliable and non-destructive method for gastropod shell volume estimation in ecological research.
  • While OCT is broadly applicable, the NOCT protocol may be more efficient for shells with complex ornamentation or high-spired structures.
  • Software choice, such as OsiriX MD, can influence accuracy and reproducibility in CT-based volume analysis.