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Dose-area product measurements in paediatric radiography
S McDonald1, C J Martin, C L Darragh
1Royal Aberdeen Children's Hospital, UK.
The British Journal of Radiology
|April 1, 1996
Summary
Dose-area product (DAP) monitoring in pediatric radiography is effective. Avoiding grids significantly reduces radiation doses, with doses without grids being only 20% of those with grids.
Area of Science:
- Medical Physics
- Radiology
- Pediatric Imaging
Background:
- Dose-area product (DAP) is a sensitive and easily recordable parameter for monitoring radiation doses in pediatric radiography.
- Assessing radiation doses in pediatric patients requires specific methodologies due to their unique physiology.
- The use of grids in radiography can significantly influence patient radiation dose.
Purpose of the Study:
- To evaluate the utility of dose-area product (DAP) measurements for monitoring radiation doses in pediatric radiography.
- To compare DAP measurements with entrance dose measurements for various radiographic projections.
- To investigate the impact of using or not using a grid on radiation doses in pediatric examinations.
Main Methods:
- Conducted DAP measurements for single radiographic projections on pediatric patients.
- Compared DAP measurements with entrance dose measurements.
- Analyzed radiographic examinations performed with and without a grid.
- Established relationships between DAP, entrance dose, and patient size/age.
Main Results:
- A linear relationship was observed between DAP and entrance dose for pelvis, abdomen, spine, and skull radiographs (+/- 20% variation). Chest radiograph data showed more scatter.
- Logarithm of DAP showed a linear correlation with equivalent patient diameter, enabling age or size-based reference levels.
- Effective doses ranged from 0.1-0.3 mSv for 5-15 year olds and <0.03 mSv for 0-1 year olds for AP abdomen, pelvis, and spine radiographs.
- Examinations performed without a grid resulted in doses approximately 20% of those with a grid.
Conclusions:
- Dose-area product (DAP) is a valuable tool for dose monitoring in pediatric radiography.
- Significant radiation dose reductions in pediatric radiology are achievable by avoiding the use of grids.
- Optimizing grid usage or elimination can lead to substantial dose savings in pediatric X-ray examinations.
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