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SU-E-I-57: CT Dose Metrics: What Are We Tracking.
J Guild1, G Arbique1, T Blackburn1
1UT Southwestern Medical Ctr at Dallas, Dallas, TX.
Medical Physics
|May 19, 2017
Summary
Accurate patient dose monitoring requires detailed CT scan data, not just cumulative metrics. Current reporting methods are insufficient for establishing effective CT reference dose levels (RDLs).
Area of Science:
- Medical Imaging Physics
- Radiology Informatics
Background:
- Regulatory bodies mandate establishing CT reference dose levels (RDLs) and recording dose metrics.
- Current CT dose reporting practices are often fragmented and lack standardization.
Purpose of the Study:
- To identify optimal CT dose metrics for patient dose monitoring and RDL determination.
- To evaluate the adequacy of current CT reporting for regulatory compliance.
Main Methods:
- Comparison of manually entered cumulative dose metrics (DLP, CTDIvol) with detailed dose data from PACS.
- Analysis of challenges in dose reporting for multi-phase, dynamic, and add-on scans.
Main Results:
- Simple cumulative dose metrics (CTDIvol, DLP) are inadequate for accurate patient dose assessment.
- Dynamic scanning and non-overlapping add-on scans significantly skew reported dose values.
- Lack of anatomical information in reports hinders effective dose monitoring.
Conclusions:
- Current CT reporting systems lack the granularity needed for precise patient dose monitoring.
- Image-based review is necessary to interpret dose metrics accurately.
- Enhanced, acquisition-specific dose reporting is required to meet regulatory and clinical needs.
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