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Related Experiment Videos

Reducing transmitted radiation in dental radiography.

M Bourgeois1, R E Wood, M J Pharoah

  • 1Department of Dentistry, Ontario Cancer Institute, Princess Margaret Hospital, Toronto, Canada.

Health Physics
|June 1, 1992
PubMed
Summary

Adding extra lead layers to dental X-ray film packs significantly reduces radiation dose to tissues behind the image receptor. This enhancement helps protect critical organs like the thyroid from scatter radiation during dental radiography.

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Area of Science:

  • Radiological Physics
  • Dental Imaging Technology
  • Radiation Protection

Background:

  • Conventional dental radiography releases significant radiation from the image receptor's rear.
  • Existing lead backing offers incomplete protection against transmitted radiation.

Purpose of the Study:

  • To evaluate the effectiveness of additional lead foil layers in reducing radiation dose behind dental image receptors.
  • To minimize scatter radiation exposure to sensitive tissues, including the thyroid and salivary glands.

Main Methods:

  • Utilized a calibrated thermoluminescent lithium fluoride dosimetry system (TLD).
  • Employed a tissue-equivalent anthropomorphic phantom for accurate dose measurements.
  • Systematically added lead foil layers to the image receptor and measured transmitted dose under varying kVp settings (70 and 90 kVp) for a molar bitewing projection.

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Main Results:

  • Four layers of lead foil (3.92 x 10(-3) mm) significantly reduced radiation dose.
  • The dose reduction achieved was substantial, resulting in less than one-third of the dose compared to conventional shielding.

Conclusions:

  • Implementing additional lead shielding on dental image receptors is an effective strategy for dose reduction.
  • This method offers improved protection for patients by minimizing radiation exposure to critical organs from scatter radiation.