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Patient size as a parameter for determining Diagnostic Reference Levels for paediatric Computed Tomography (CT)
Duminda Satharasinghe1, Jeyasingam Jeyasugiththan1, W M N M B Wanninayake2
1Department of Nuclear Science, University of Colombo, Colombo, 00300, Sri Lanka.
Summary
This study established achievable dose (AD) and national diagnostic reference levels (NDRL) for paediatric CT scans in Sri Lanka. These findings provide crucial benchmarks for optimizing radiation doses in pediatric imaging.
Area of Science:
- Medical Imaging
- Radiology
- Pediatric Health
Background:
- Paediatric radiation dose has not been previously studied in Sri Lanka.
- No national diagnostic reference levels (NDRL) were established for paediatric CT in Sri Lanka.
- This study addresses the need for size-based dose reference values in paediatric CT.
Purpose of the Study:
- To propose diagnostic reference levels (DRL) and achievable dose (AD) values for paediatric CT examinations.
- To establish size-specific DRL and AD for head, chest, and abdomen CT scans in children.
- To provide benchmarks for radiation dose optimization in paediatric imaging.
Main Methods:
- Conducted a study on 658 paediatric (0-15 years) non-contrast-enhanced CT scans (head, chest, abdomen).
- Analyzed dose indices based on age for head CT and age/effective diameter for body CT.
- Calculated AD (median) and NDRL (third quartile) from pooled dose distributions.
Main Results:
- Reported AD ranges for head, chest, and abdomen CT using CTDIvol: 45.8-57.2 mGy, 2.9-10.0 mGy, and 3.8-10.3 mGy, respectively.
- Reported NDRL ranges for head, chest, and abdomen CT using CTDIvol: 45.8-95.8 mGy, 3.5-14.1 mGy, and 4.5-11.9 mGy, respectively.
- Provided AD and NDRL ranges based on SSDEdeff and deff for chest and abdomen regions.
Conclusions:
- The established DRLs can serve as a reference dose for paediatric CT in other institutions.
- The AD values offer a baseline for targeted dose optimization, potentially reducing doses by up to 90%.
- This study provides essential data for improving radiation safety in paediatric CT imaging in Sri Lanka.
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