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Related Experiment Videos

Radiation absorbed doses in cephalography.

S Eliasson, P Julin, S Richter

    Swedish Dental Journal
    |January 1, 1984
    PubMed
    Summary

    This study measured organ radiation doses during cephalography X-rays. Shielding and collimation significantly reduced thyroid gland radiation exposure, enhancing patient safety.

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    Area of Science:

    • Medical Physics
    • Radiology
    • Radiation Dosimetry

    Background:

    • Cephalography is a common radiographic technique used in orthodontics and maxillofacial surgery.
    • Accurate assessment of radiation absorbed doses to organs in the head and neck is crucial for patient safety.
    • Understanding dose distribution is essential for optimizing imaging protocols and minimizing potential risks.

    Purpose of the Study:

    • To investigate and quantify the radiation absorbed doses to various organs in the head and neck region during lateral (LAT) and postero-anterior (PA) cephalography.
    • To evaluate the effectiveness of shielding and collimation techniques in reducing radiation exposure to sensitive organs, particularly the thyroid gland.

    Main Methods:

    • Radiation doses were measured using thermoluminescence dosimeters (TLD) placed on a tissue-equivalent phantom head.
    • Lanthanide screens (speed group 4) were utilized at 90 and 85 kVp.
    • A near-focus aluminum dodger and strict collimation of the radiation beam to the face were employed.

    Main Results:

    • Maximum entrance doses were 0.25 mGy (LAT) and 0.42 mGy (PA).
    • Salivary gland doses ranged from 0.02 to 0.2 mGy (LAT) and 0.04 to 0.15 mGy (PA).
    • Average thyroid doses were 0.11 mGy (LAT) and 0.06 mGy (PA) without shielding; shielding reduced LAT dose to 0.07 mGy, and collimation further decreased it to 0.005 mGy.

    Conclusions:

    • Cephalography involves measurable radiation doses to head and neck organs.
    • Implementing shielding and precise beam collimation, especially for the thyroid gland, can substantially reduce radiation exposure.
    • These findings support the optimization of cephalography protocols to enhance patient safety and minimize cumulative radiation risks.

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