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Related Concept Videos

Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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For solids whose cross-sectional areas vary in a predictable way, volume can be determined by integrating these areas along an axis perpendicular to the slices. This approach is particularly useful for polyhedral solids, where classical geometric formulas may not be immediately applicable. A tetrahedron provides a clear example of how cross-sectional integration can be applied to a three-dimensional object with continuously changing geometry.Consider a tetrahedron with height h and a base that...
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Computed Tomography

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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The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.

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Reliability of Artificial Intelligence-Based Cone Beam Computed Tomography Integration with Digital Dental Images
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[Validity of tooth volume determinations using cone beam computed tomography].

Yi Liu1, James Mah, Tian-min Xu

  • 1Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.

Beijing Da Xue Xue Bao. Yi Xue Ban = Journal of Peking University. Health Sciences
|February 9, 2010
PubMed
Summary

Cone beam computed tomography (CBCT) can accurately measure tooth volume in vivo. While slight deviations exist, this method offers a feasible approach for dental volumetric analysis.

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Area of Science:

  • Dentistry
  • Radiology
  • Biomedical Imaging

Background:

  • Accurate tooth volume measurement is crucial for orthodontic and restorative treatments.
  • Cone beam computed tomography (CBCT) offers detailed 3D imaging of dental structures.

Purpose of the Study:

  • To assess the accuracy of in vivo volumetric analysis of teeth using CBCT.
  • To compare radiographic volumes with physical volumes of extracted teeth.

Main Methods:

  • Physical volume (Vw) of 24 bicuspids determined by water displacement.
  • Radiographic volume (Va) calculated from CBCT scans using Amira 4.0 software.
  • Measurements performed twice by two observers; statistical analysis included paired t-test and correlation coefficients.

Main Results:

  • Mean physical volume was 0.553 cm³; mean radiographic volumes ranged from 0.529 to 0.567 cm³.
  • Statistically significant differences found between radiographic and physical volumes (P<0.05).
  • High inter- and intra-observer reliability observed; surface smoothing reduced volume by 3%-12%.

Conclusions:

  • In vivo tooth volume determination using CBCT is feasible.
  • CBCT measurements showed slight deviations from physical volumes (-4% to 7%).
  • Surface smoothing techniques impact volume measurements.