Monte Carlo simulation of the dose distribution of ICRP adult reference computational phantoms for acquisitions with a 320 detector-row cone-beam CT scanner
| Autor: | M. Salvadó, Maria Cros, Raoul M. S. Joemai, A. Calzado, Jacob Geleijns |
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| Rok vydání: | 2015 |
| Předmět: |
Adult
Male ICRP adult reference computational phantoms Scanner Computer science Monte Carlo method Biophysics 320 Detector-row cone beam CT scanner General Physics and Astronomy Dose profile Dose distribution Radiation Dosage Computed Tomography dose assessment Radiation Protection Tube current modulation Humans Radiology Nuclear Medicine and imaging Monte Carlo simulation Cone beam ct Phantoms Imaging business.industry Detector General Medicine Cone-Beam Computed Tomography Female Patient dose Nuclear medicine business Monte Carlo Method Software |
| Zdroj: | Physica Medica, 31(5), 452-462 |
| ISSN: | 1120-1797 |
| DOI: | 10.1016/j.ejmp.2015.04.007 |
| Popis: | Purpose The purpose of this study was to develop and validate a Monte Carlo (MC) simulation tool for patient dose assessment for a 320 detector-row CT scanner, based on the recommendations of International Commission on Radiological Protection (ICRP). Additionally, the simulation was applied on four clinical acquisition protocols, with and without automatic tube current modulation (TCM). Methods The MC simulation was based on EGS4 code and was developed specifically for a 320 detector-row cone-beam CT scanner. The ICRP adult reference phantoms were used as patient models. Dose measurements were performed free-in-air and also in four CTDI phantoms: 150 mm and 350 mm long CT head and CT body phantoms. The MC program was validated by comparing simulations results with these actual measurements acquired under the same conditions. The measurements agreed with the simulations across all conditions within 5%. Patient dose assessment was performed for four clinical axial acquisitions using the ICRP adult reference phantoms, one of them using TCM. Results The results were nearly always lower than those obtained from other dose calculator tools or published in other studies, which were obtained using mathematical phantoms in different CT systems. For the protocol with TCM organ doses were reduced by between 28 and 36%, compared to the results obtained using a fixed mA value. Conclusions The developed simulation program provides a useful tool for assessing doses in a 320 detector-row cone-beam CT scanner using ICRP adult reference computational phantoms and is ready to be applied to more complex protocols. |
| Databáze: | OpenAIRE |
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