A Review of Diagnostic Reference Levels in Computed Tomography

Area of Science:

• Medical Physics
• Radiology
• Health Sciences

Background:

• Computed Tomography (CT) scans provide 3-D imaging but involve patient radiation exposure.
• Optimizing radiation dose is essential, necessitating the establishment of Diagnostic Reference Levels (DRLs).
• DRLs are derived from patient dose distributions, aiding professional judgment and harmonizing radiation dose evidence.

Purpose of the Study:

• To review the international application of Diagnostic Reference Levels (DRLs) in Computed Tomography (CT) procedures.
• To assess how DRLs contribute to optimizing patient radiation doses while maintaining diagnostic image quality.
• To highlight the importance of DRLs in reducing dose variability and improving radiological practice.

Main Methods:

• Literature review of international practices and studies on Diagnostic Reference Levels (DRLs) in CT.
• Analysis of dose distribution data and reference patient percentiles (e.g., 90th, 75th, 50th).
• Assessment of the impact of varying CT exam protocols and technical parameters on dose distributions.

Main Results:

• International CT dose distributions show significant variation due to diverse protocols and parameters.
• DRLs are instrumental in reducing dose dispersion and standardizing radiation practices.
• Effective implementation of DRLs requires systematic supervision and adherence to established guidelines.

Conclusions:

• Diagnostic Reference Levels (DRLs) are indispensable for managing patient radiation doses in CT.
• Each CT facility must implement dose reduction strategies, balancing dose with diagnostic image quality.
• Continuous follow-up and adherence to guidelines are necessary for effective DRL application and dose optimization.