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Computed Tomography01:10

Computed Tomography

4.7K
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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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Related Experiment Video

Updated: Aug 14, 2025

Author Spotlight: Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
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Cartesian three-dimensional method to quantify displacements between cone beam computed tomography models.

Caroline Pelagio Maués Casagrande1, Marcus Vinicius Sena Casagrande2, Andressa Otranto de Brito Teixeira1

  • 1Universidade do Estado do Rio de Janeiro, Faculdade de Odontologia (Rio de Janeiro/RJ, Brazil).

Dental Press Journal of Orthodontics
|January 11, 2023
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Summary
This summary is machine-generated.

This study introduces a reliable method for tracking 3D object displacements, crucial for evaluating orthodontic and oral surgery treatments. The new technique accurately measures bone segment movements with minimal error.

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Area of Science:

  • Orthodontics and Oral Surgery
  • Medical Imaging
  • Biomechanical Engineering

Background:

  • Current three-dimensional (3D) models for treatment evaluation in orthodontics and oral surgery have limitations.
  • Displacement color map techniques are commonly used but have significant drawbacks.

Purpose of the Study:

  • To propose and validate a novel method for tracking translational movements of 3D objects.
  • To evaluate displacements in surfaces without shape modification, overcoming limitations of existing techniques.

Main Methods:

  • Cone Beam Computed Tomography (CBCT) data from ten patients were utilized.
  • A virtual surgical plan was simulated and analyzed using the proposed tracking method.
  • High-quality STL models were generated using ITK-Snap software, with centroid points automatically analyzed.

Main Results:

  • The method demonstrated excellent inter-examiner and intra-examiner reliability.
  • Mean displacement measurement error was consistently below 0.1mm.
  • Statistical analysis (paired t-test) revealed no significant differences, confirming accuracy.

Conclusions:

  • The developed method reliably tracks simulated translational displacements of bone segments.
  • This technique offers a promising advancement for quantitative analysis in surgical planning and outcome assessment.