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Absorbed doses modified by exposure settings with rotational panoramic radiography
Y Hayakawa1, N Kobayashi, Y Kousuge
1Department of Oral and Maxillofacial Radiology, Tokyo Dental College, Japan.
The Bulletin of Tokyo Dental College
|August 1, 1994
Summary
This study measured radiation doses to the parotid gland, cervical vertebrae, and thyroid gland during panoramic radiography. The parotid gland received the highest absorbed dose, which increased with tube current and voltage.
Area of Science:
- Radiology
- Medical Physics
- Radiation Dosimetry
Background:
- Panoramic radiography is a common dental imaging technique.
- Understanding radiation dose distribution is crucial for patient safety.
- Specific organs like the parotid gland, cervical vertebrae, and thyroid gland are susceptible to radiation exposure.
Purpose of the Study:
- To quantify absorbed doses to the parotid gland, cervical vertebrae, and thyroid gland.
- To evaluate the impact of varying tube voltage and tube current on these absorbed doses.
- To compare dose magnitudes across different organs and exposure settings.
Main Methods:
- Utilized rotational panoramic radiography units (Veraview and PM 2002 CC).
- Employed a Rando phantom for realistic tissue simulation.
- Measured absorbed doses using thermoluminescence dosimeters.
- Varied exposure settings including tube voltage and tube current.
Main Results:
- Absorbed doses were highest in the parotid gland, followed by cervical vertebrae, then thyroid gland.
- Organ absorbed doses showed a direct proportionality to the tube current.
- The thyroid gland's absorbed dose increased more sharply with rising tube voltage compared to other organs.
Conclusions:
- The parotid gland is the most exposed organ during panoramic radiography.
- Radiation dose is significantly influenced by radiographic exposure parameters (tube current and voltage).
- Radiographic technique optimization is necessary to minimize radiation exposure to critical organs like the thyroid gland.