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Related Experiment Videos

Technique-dependent decrease in thyroid absorbed dose for dental radiography.

R E Wood1, R G Bristow, G M Clark

  • 1Department of Radiology, Faculty of Dentistry, University of Stellenbosch, Capetown, South Africa.

Health Physics
|June 1, 1989
PubMed
Summary
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Dental radiography significantly reduces thyroid radiation dose with lead shielding. Higher kilovoltage (kVp) effectiveness depends on the specific dental x-ray technique used, impacting thyroid absorbed dose.

Area of Science:

  • Radiological Physics
  • Dental Imaging
  • Radiation Dosimetry

Background:

  • Dental radiography is essential for diagnosis but poses radiation risks.
  • Thyroid dose reduction is critical in dental procedures.
  • Optimizing radiation protection in dental settings is an ongoing concern.

Purpose of the Study:

  • To quantify thyroid radiation doses from complete-mouth dental radiographic procedures.
  • To compare the effectiveness of lead shielding and varying kilovoltage (kVp) settings on thyroid dose.
  • To evaluate the influence of different radiographic techniques on thyroid dose.

Main Methods:

  • Utilized a calibrated Lithium Fluoride (LiF) thermoluminescent dosimetry (TLD) system.
  • Measured thyroid region dosages in an anthropomorphic phantom.

Related Experiment Videos

  • Compared two dental radiographic techniques (bisecting angle and paralleling) with 70-kVp and 90-kVp x-ray beams.
  • Investigated the impact of lead apron and thyroid collar shielding.

    • Main Results:

    • Lead shielding significantly decreased thyroid dose for both techniques (p < 0.05).
    • The 90-kVp beam significantly reduced thyroid dose with the bisecting angle technique (p < 0.05).
    • Conversely, the 90-kVp beam significantly increased thyroid dose with the paralleling technique (p < 0.05).

    Conclusions:

    • Lead shielding is effective in reducing thyroid radiation exposure during dental radiography.
    • The choice of kilovoltage (kVp) and radiographic technique (bisecting angle vs. paralleling) critically influences thyroid absorbed dose.
    • Higher kilovoltage implementation in dental practices requires careful consideration of the employed radiographic technique to ensure radiation safety.