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Local Diagnostic Reference Levels for Common Adult Computed Tomography Procedures in Addis Ababa
Seife Teferi Dellie1, Ambaye Fisehaw Tesfaw2, Marema Jebessa Kumsa3
1Medical Physics, Tikur Andesa Specialized Hospital, Department of Radiology, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia.
Establishing Local Diagnostic Reference Levels is crucial for managing radiation exposure from Computed Tomography (CT) scans. This study found CT dose indicators in Addis Ababa align with national and international benchmarks.
Area of Science:
- Medical Imaging
- Radiology
- Radiation Protection
Background:
- Computed Tomography (CT) is a significant contributor to population exposure from diagnostic X-rays.
- Setting Local Diagnostic Reference Levels (LDRLs) is essential for optimizing radiation doses.
- This study addresses the need for establishing LDRLs in diagnostic imaging.
Purpose of the Study:
- To assess dose indicators for establishing Local Diagnostic Reference Levels (LDRLs) in CT examinations.
- To provide data for optimizing radiation protection in medical imaging practices.
- To compare local CT dose metrics with established national and international standards.
Main Methods:
- A prospective cross-sectional study involving 725 adult patients undergoing CT scans (head, chest, abdominopelvic).
- Data collection included patient demographics, exposure parameters, and dose descriptors from 8 public and private hospitals.
- Statistical analysis using SPSS software, focusing on third quartile values of dose indicators.
Main Results:
- Third quartile values for volumetric Computed Tomography Dose Index (mGy) were 53 mGy (head), 14 mGy (chest), and 13 mGy (abdominopelvic).
- Third quartile values for Dose Length Product (mGy.cm) were 1307 mGy.cm (head), 575 mGy.cm (chest), and 932 mGy.cm (abdominopelvic).
- These values serve as proposed Local Diagnostic Reference Levels (LDRLs).
Conclusions:
- CT imaging practices in Addis Ababa public and private hospitals are comparable to national and international levels.
- The established LDRLs provide a benchmark for radiation dose optimization in local CT examinations.
- Findings support the implementation of LDRLs to ensure radiation safety in diagnostic CT.
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