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Anatomical and Clinical Diagnostic Reference Levels; An Update

K Kanal1*, J Damilakis2*, V Tsapaki3*, (1) University Washington, Seattle, WA, (2) University of Crete, Crete, GR, (3) International Atomic Energy Agence, Vienna, Vienna, AT


(Sunday, 7/12/2020) 10:30 AM - 11:30 AM [Eastern Time (GMT-4)]

Room: Track 4

Many publications underline the importance of establishing diagnostic reference levels (DRLs) on patient optimization specially in high-dose medical examinations (CT/ interventional radiology). Most countries have established anatomical DRLs. In USA, DRLs and achievable doses (ADs) for the 10 most common adult CT examinations in the United States have been established as a function of patient size using the American College of Radiology (ACR) CT Dose Index Registry. Pediatric DRLs and ADs are in the process of being developed. Development of DRLs will enable facilities to effectively compare their patient doses to national benchmarks and more effectively optimize their CT protocols for the wide range of patient habitus they examine and thus, appropriately reduce dose to patients.

Recent publications also show that clinical indication dictates the main parameters that affect patient dose i.e. image quality, duration of technique, number of scanning phases or images, etc. Thus, different image quality is needed for different clinical indications of the same anatomical area. Therefore, DRLs should be specified for a given clinical indication. The European Commission has recently launched the ‘European study on clinical diagnostic reference levels for x-ray medical imaging’ (EUCLID) project to provide up-to-date clinical DRLs. Its main objective is to establish DRLs for the most important CT and interventional radiology (IR) clinical indications.

The last years big repositories are used for studying patient samples. Can these repositories be also used for the establishment of anatomical or clinical DRLs? The lectures in this session will address these issues.

Learning Objectives:
1. To learn the concept of DRLs and clinical DRLs
2. Use DRLs to compare patient doses with national benchmarks
3. Use DRLs to optimize CT/IR protocols
4. To learn how the patent repositories can facilitate the establishment of DRLs



CT, Diagnostic Radiology, Radiation Dosimetry


IM- Radiation Dose and Risk: General (Most Aspects)

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