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Erschienen in: European Radiology 4/2008

01.04.2008 | Computer Tomography

Validation of a Monte Carlo tool for patient-specific dose simulations in multi-slice computed tomography

verfasst von: Paul Deak, Marcel van Straten, Paul C. Shrimpton, Maria Zankl, Willi A. Kalender

Erschienen in: European Radiology | Ausgabe 4/2008

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Abstract

Estimating the dose delivered to the patient in X-ray computed tomography (CT) examinations is not a trivial task. Monte Carlo (MC) methods appear to be the method of choice to assess the 3D dose distribution. The purpose of this work was to extend an existing MC-based tool to account for arbitrary scanners and scan protocols such as multi-slice CT (MSCT) scanners and to validate the tool in homogeneous and heterogeneous phantoms. The tool was validated by measurements on MSCT scanners for different scan protocols under known conditions. Quantitative CT Dose Index (CTDI) measurements were performed in cylindrical CTDI phantoms and in anthropomorphic thorax phantoms of various sizes; dose profiles were measured with thermoluminescent dosimeters (TLD) in the CTDI phantoms and compared with the computed dose profiles. The in-plane dose distributions were simulated and compared with TLD measurements in an Alderson-Rando phantom. The calculated dose values were generally within 10% of measurements for all phantoms and all investigated conditions. Three-dimensional dose distributions can be accurately calculated with the MC tool for arbitrary scanners and protocols including tube current modulation schemes. The use of the tool has meanwhile also been extended to further scanners and to flat-detector CT.
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Metadaten
Titel
Validation of a Monte Carlo tool for patient-specific dose simulations in multi-slice computed tomography
verfasst von
Paul Deak
Marcel van Straten
Paul C. Shrimpton
Maria Zankl
Willi A. Kalender
Publikationsdatum
01.04.2008
Verlag
Springer-Verlag
Erschienen in
European Radiology / Ausgabe 4/2008
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-007-0815-7

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