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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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Related Experiment Video

Updated: Oct 26, 2025

Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis
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CT-guided bone biopsy using electron density maps from dual-energy CT.

Shota Yamamoto1, Shunsuke Kamei1, Kosuke Tomita1

  • 1Department of Radiology, Tokai University Hachioji Hospital, Tokai University School of Medicine, Tokyo, Japan.

Radiology Case Reports
|July 26, 2021
PubMed
Summary

Dual-energy CT (DECT) provides electron density (ED) maps that can help identify high cellularity in bone lesions. This technique shows promise for accurately detecting metastases during CT-guided bone biopsies.

Keywords:
Bone biopsyBone metastasisComputed tomography-guided interventionDual energy computed tomographyElectron density

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Area of Science:

  • Radiology
  • Oncology
  • Pathology

Background:

  • Computed tomography (CT)-guided bone biopsy is a valuable diagnostic tool for musculoskeletal conditions.
  • A key limitation of conventional CT-guided bone biopsy is the inability to confirm tumor cell presence during the procedure.

Observation:

  • Dual-energy CT (DECT) offers advanced capabilities, including material decomposition and the generation of electron density (ED) maps.
  • ED maps have demonstrated potential in reflecting tissue cellularity.

Findings:

  • In a case study, electron density (ED) maps generated using DECT were utilized during a CT-guided bone biopsy of the ilium.
  • High ED values precisely corresponded to the tumorous areas with high cellularity when compared with the pathological specimen.

Implications:

  • DECT-derived ED maps may enhance the accuracy of CT-guided bone biopsies by aiding in the identification of metastatic lesions with high cellularity.
  • This technique could improve diagnostic yield and patient outcomes in oncology.