Development and Validation of a GEANT4 Radiation Transport Code for CT Dosimetry

ABSTRACTThe authors have created a radiation transport code using the GEANT4 Monte Carlo toolkit to simulate pediatric patients undergoing CT examinations. The focus of this paper is to validate their simulation with real-world physical dosimetry measurements using two independent techniques. Exposu...

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Bibliographic Details
Published in:	Health physics (1958) Vol. 108; no. 4; pp. 419 - 428
Main Authors:	Carver, D E, Kost, S D, Fernald, M J, Lewis, K G, Fraser, N D, Pickens, D R, Price, R R, Stabin, M G
Format:	Journal Article
Language:	English
Published:	United States by the Health Physics Society 01-04-2015 Lippincott Williams & Wilkins Ovid Technologies
Subjects:	Child Computer Simulation Health physics Humans Measurement Monte Carlo Method Monte Carlo simulation Phantoms, Imaging Photons Polymethyl Methacrylate - chemistry Radiation Radiation Dosage Radiation Monitoring Spectrometry, Gamma Tomography, X-Ray Computed - methods
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Summary:	ABSTRACTThe authors have created a radiation transport code using the GEANT4 Monte Carlo toolkit to simulate pediatric patients undergoing CT examinations. The focus of this paper is to validate their simulation with real-world physical dosimetry measurements using two independent techniques. Exposure measurements were made with a standard 100‐mm CT pencil ionization chamber, and absorbed doses were also measured using optically stimulated luminescent (OSL) dosimeters. Measurements were made in air with a standard 16‐cm acrylic head phantom and with a standard 32‐cm acrylic body phantom. Physical dose measurements determined from the ionization chamber in air for 100 and 120 kVp beam energies were used to derive photon-fluence calibration factors. Both ion chamber and OSL measurement results provide useful comparisons in the validation of the Monte Carlo simulations. It was found that simulated and measured CTDI values were within an overall average of 6% of each other.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0017-9078 1538-5159
DOI:	10.1097/HP.0000000000000243