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Absorbed dose reduced by sliced exposure using sector selector system 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
The sector selector system in panoramic radiography can reduce thyroid radiation dose. Adjusting horizontal and vertical settings minimizes radiation exposure, particularly from the mandibular region.
Area of Science:
- Dental Radiology
- Radiation Protection
- Medical Physics
Background:
- Panoramic radiography is a common dental imaging technique.
- Thyroid gland dose is a concern in dental radiography.
- Sector selector systems offer potential for dose reduction.
Purpose of the Study:
- To evaluate the impact of horizontal and vertical sector selector systems on thyroid gland dose.
- To identify regions contributing most to thyroid dose during panoramic radiography.
- To assess the effectiveness of the PM 2002 CC sector selector system.
Main Methods:
- Utilized a Rando Phantom to simulate human anatomy.
- Employed thermoluminescence dosimeters to measure radiation dose.
- Investigated dose variations with horizontal and vertical sector selector adjustments.
- Analyzed dose contributions from different anatomical regions.
Main Results:
- The horizontal sector selector significantly reduced thyroid dose when the mandibular region was the primary exposure area.
- The vertical sector selector showed equal contributions to thyroid dose from incisor/canine, premolar/molar, and ramus regions.
- Scattered X-rays were identified as a key factor in thyroid dose.
Conclusions:
- Sector selector systems in panoramic radiography can effectively reduce thyroid gland dose.
- Understanding the impact of horizontal and vertical settings is crucial for optimizing radiation protection.
- Further research can refine sector selector use for enhanced patient safety in dental imaging.