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Red bone marrow doses, integral absorbed doses, and somatically effective dose equivalent from four maxillary
Oral Surgery, Oral Medicine, and Oral Pathology
|February 1, 1984
Summary
The axial incisal view in dental radiography results in the highest radiation exposure to red bone marrow (RBM). Optimizing focus-skin distance and tube potential can significantly reduce patient radiation load during maxillary occlusal projections.
Area of Science:
- Radiology
- Medical Physics
- Dental Imaging
Background:
- Dental radiography, particularly maxillary occlusal projections, involves ionizing radiation exposure.
- Accurate dosimetry is crucial for assessing patient radiation load and optimizing imaging protocols.
- Red bone marrow (RBM) is a radiosensitive organ, making RBM dose estimation important in diagnostic imaging.
Purpose of the Study:
- To quantify red bone marrow (RBM) doses, integral absorbed doses, and somatically effective dose equivalent (SEDE) for four maxillary occlusal projections.
- To compare radiation exposure across different projections and technical parameters (focus-skin distance, tube potential).
- To identify projections and parameters that minimize patient radiation load.
Main Methods:
- Phantom measurements were conducted using four maxillary occlusal projections: axial incisal, frontal, lateral occlusal, and tuber views.
- Various combinations of focus-skin distances and tube potentials were utilized for each projection.
- Doses were measured, including red bone marrow (RBM) dose, integral absorbed dose, and somatically effective dose equivalent (SEDE).
Main Results:
- The axial incisal view exhibited the highest radiation exposure, with maximum RBM dose (122.5 microGy/exposure), integral absorbed dose (8.6 mJ/exposure), and SEDE (39.6 microSv/exposure).
- Frontal, lateral occlusal, and tuber views showed significantly lower doses, ranging from 4% to 44% of the axial incisal view for integral absorbed dose and SEDE.
- Increasing focus-skin distance (17.5 cm to 27 cm) reduced integral absorbed dose by 24-30%.
- Increasing tube potential (50 kV to 65 kV) reduced absorbed energy by 23%.
Conclusions:
- The axial incisal projection poses the highest radiation risk among the evaluated maxillary occlusal views.
- Optimizing focus-skin distance and tube potential can effectively reduce patient radiation exposure.
- Radiological protocols should consider these findings to minimize radiation dose in dental imaging.