Congress:
EuroSafe Imaging 2019
Keywords:
Action 2 - Clinical diagnostic reference levels (DRLs), Action 3 - Image quality assessment based on clinical indications, Head and neck, Trauma, CT, Diagnostic procedure, Experimental investigations, Image verification, Dosimetric comparison
Authors:
G. Widmann, A. Al-Ekrish, W. Jaschke
DOI:
10.26044/esi2019/ESI-0006
Description of activity and work performed
Several cadaver studies were performed in which reference images a Discovery CT750 HD scanner at CTDIvol of 29-37 mGy (DRLs for craniomaxillofacial and cranial CT are 20 mGy and 60 mGy,
respectively) were compared with test images at doses reaching sub-mGy levels.
Comparative quantitative measurements,
visual grading analysis and receiver operating characteristics were performed.
The influence of iterative reconstructions has been evaluated.
The following ALADA doses could be identified for the subsequent indications:
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trauma 2.66 mGy [2-3]
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identification of the inferior alveolar nerve 2.64 mGy [4]
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linear measurements 0.53 mGy [5-6]
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subjective classification of bone type 0.29 mGy [7]
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computer-aided design models 0.99 mGy [8]
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and computer-aided surgical navigation 0.76 mGy [9].
Compared to filtered back projection,
iterative reconstructions (ASIR-50,
ASIR-100,
and MBIR/VEO) improved signal-to-noise ratios but could not improve spatial resolution.