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Imaging Studies III: Computed Tomography

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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Subgingival calculus imaging based on swept-source optical coherence tomography.

Yao-Sheng Hsieh1, Yi-Ching Ho, Shyh-Yuan Lee

  • 1National Yang-Ming University, Biophotonics Interdisciplinary Research Center and Institute of Biophotonics, No. 155, Sec. 2, Linong Street, Taipei, Taiwan 112, Taipei, Taiwan.

Journal of Biomedical Optics
|August 3, 2011
PubMed
Summary
This summary is machine-generated.

Swept-source optical coherence tomography (SS-OCT) effectively images dental calculus by leveraging its distinct scattering properties. This advanced imaging technique differentiates calculus from tooth enamel, aiding in dental diagnostics.

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Area of Science:

  • Biomedical Optics
  • Dental Imaging
  • Materials Science

Background:

  • Dental calculus, a hardened plaque, poses diagnostic challenges.
  • Accurate characterization of dental calculus is crucial for effective treatment.
  • Non-invasive imaging methods are needed for in-situ analysis.

Purpose of the Study:

  • To characterize and image dental calculus using swept-source optical coherence tomography (SS-OCT).
  • To measure the refractive indices of dental tissues and calculus.
  • To evaluate SS-OCT's capability in differentiating calculus from enamel.

Main Methods:

  • Dental calculus and tooth structures were imaged using SS-OCT.
  • Refractive indices of enamel, dentin, cementum, and calculus were measured.
  • An in vitro sample of an extracted human tooth with calculus and gingiva tissue was used for tomographic imaging.

Main Results:

  • Dental calculus exhibits strong scattering properties compared to enamel.
  • Refractive indices were measured: enamel (1.625 ± 0.024), dentin (1.534 ± 0.029), cementum (1.570 ± 0.021), and calculus (2.097 ± 0.094).
  • SS-OCT successfully identified calculus regions distinct from enamel.

Conclusions:

  • SS-OCT is a viable method for imaging and characterizing dental calculus.
  • The distinct optical properties of calculus enable its identification using SS-OCT.
  • This technique holds potential for improved dental diagnostics and treatment planning.