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This study developed a system for unified management of CT examination dose data across multiple facilities. Findings aim to optimize radiation dose by comparing national diagnostic reference levels (DRLs) and identifying variations.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Health Informatics

Background:

  • CT examinations generate significant radiation dose data.
  • Variability in CT radiation doses across facilities necessitates standardized management.
  • Establishing national diagnostic reference levels (DRLs) is crucial for radiation safety.

Purpose of the Study:

  • To construct a system for collecting and unifying CT examination dose information from multiple facilities.
  • To compare collected dose data with national diagnostic reference levels (DRLs).
  • To facilitate dose optimization through feedback and investigation of abnormal values.

Main Methods:

  • Collected medical information from 139,144 tests across 33 CT devices in 13 facilities.
  • Implemented a system for unified dose data management.
  • Analyzed and compared collected CT dose data with established national DRLs.

Main Results:

  • The study's DRL was lower than Japan's DRL but higher than some other countries' DRLs.
  • Significant dose variation was observed, potentially due to factors beyond intended imaging sites.
  • Identified the need for continuous data collection for DRL renewal.

Conclusions:

  • A unified system for CT dose data management is feasible and aids in dose optimization.
  • Continuous data collection, including patient physique and scan region details, is essential for accurate DRLs.
  • Further investigation into dose variation causes is required for effective radiation dose reduction strategies.