Patient Individual Equivalent Dose Calculations for CT Examinations View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2009

AUTHORS

R. Schmidt , J. Wullf , B. Kästner , D. Jany , J. T. Heverhagen , M. Fiebich , K. Zink

ABSTRACT

The aim of this study is the comparison of patient specific dose-estimation in computed tomography (CT) of a dedicated Monte Carlo simulation tool with precalculated data of anthropromorphic phantoms. The developed tool GMctdospp, which allows the calculation of dose to defined structures, was employed to determine equivalent dose to lungs of six randomly chosen CT thoraxscans. The results for the estimation of lung dose were compared with the CTExpo program. To allow a better comparability the Monte Carlo data was calibrated to the CTDIair values of CTExpo for a Siemens VolumeZoom scanner with 4×2.5 mm collimation and 15 mm table shift at 90mAs. The Monte Carlo simulations included filter geometries and energy spectra provided by the vendor. Equivalent doses to the lung of the single CT-scans varied between 5.2 mSv and 7.9 mSv. The simulation times needed for a statistical uncertainty of less than 1% was approximately 10 minutes. The value obtained from the CTExpo tool and thus from an generalized anthropromorphic phantom was 6.4 mSv for this type of scan. Hence, the lung dose is influenced by the individuality of the patient by ~20%. More... »

PAGES

632-634

Book

TITLE

World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany

ISBN

978-3-642-03901-0
978-3-642-03902-7

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-3-642-03902-7_182

DOI

http://dx.doi.org/10.1007/978-3-642-03902-7_182

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1050850367


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