Global Assessment of Diagnostic Reference Levels in Conventional Radiography

Overview

This study surveyed dose-related data from multiple European institutions to define clinical diagnostic reference levels (DRLs) for 24 conventional radiography procedures. The results support harmonization of radiation exposure practices by incorporating clinical task and procedural technique alongside anatomical location.

Background

Ionizing radiation use in medical imaging requires adherence to the ALARA principle to ensure doses are medically justified and optimized. Diagnostic reference levels (DRLs) serve as investigation thresholds to guide dose optimization and are typically set at the 75th percentile of dose distributions. While DRLs have traditionally been defined by anatomical location, recent recommendations emphasize including clinical indication and procedural technique to improve optimization. This study addresses the lack of clinical DRLs for conventional radiography by collecting data from Austria, Germany, Italy, and Switzerland.

Data Highlights

Key Findings

• Clinical DRLs were defined for 24 frequently performed conventional radiography projections, incorporating clinical task and procedural technique.
• Data were collected from diverse institutions across four European countries with comparable technical equipment and protocols.
• Use of dose management systems enabled standardized collection of dose metrics such as kerma-area product (PKA) and tube voltage.
• Periodic quality assurance ensured dose measurement accuracy within 30% deviation from actual values.
• The study supports the European Commission’s goal of harmonizing radiation exposure practices across borders.

Clinical Implications

Clinicians and radiographers should consider clinical indication and procedural technique when optimizing radiographic protocols to comply with clinical DRLs. Regular review of dose data using dose management systems can help identify and address dose exceedances, enhancing patient safety. Harmonized DRLs facilitate consistent radiation protection standards across institutions and countries.

Conclusion

This international survey successfully established clinical DRLs for conventional radiography procedures, promoting optimized and harmonized radiation protection practices in Europe. Incorporating clinical task and technique alongside anatomical location enhances the relevance and effectiveness of DRLs.

References

1. European Basic Safety Standards Directive
2. International Commission on Radiological Protection (ICRP)
3. Roentgen Society’s Working Group of Physics and Technology (APT) Survey