title: Evaluation of organ doses in adult and paediatric CT examinations based on Monte Carlo simulations and in-phantom dosimetry.
abstract: The aim of this study was to validate the computed tomography dose index (CTDI) and organ doses evaluated by Monte Carlo simulations through comparisons with doses evaluated by in-phantom dosimetry. Organ doses were measured with radio-photoluminescence glass dosemeter (RGD) set at various organ positions within adult and 1-y-old anthropomorphic phantoms. For the dose simulations, the X-ray spectrum and bow-tie filter shape of a CT scanner were estimated and 3D voxelised data of the CTDI and anthropomorphic phantoms from the acquired CT images were derived. Organ dose simulations and measurements were performed with chest and abdomen-pelvis CT examination scan parameters. Relative differences between the simulated and measured doses were within 5 % for the volume CTDI and 13 % for organ doses for organs within the scan range in adult and paediatric CT examinations. The simulation results were considered to be in good agreement with the measured doses.
authors.affiliation: Department of Radiological Sciences, Nagoya University Graduate School of Medicine, 1-1-20, Daikominami, Higashi-ku, Nagoya, Japan Department of Radiology, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Japan fujii@met.nagoya-u.ac.jp.
authors.forename: K
authors.initials: K
authors.lastname: Fujii
authors.affiliation: Department of Radiology, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nomura
authors.affiliation: Department of Radiology, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Muramatsu
authors.affiliation: Department of Radiology, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.affiliation: National Institute of Radiological Sciences, Medical Exposure Research Promotion Section, 4-9-1 Anagawa, Inage-ku, Chiba, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Obara
authors.affiliation: National Institute of Radiological Sciences, Medical Exposure Research Promotion Section, 4-9-1 Anagawa, Inage-ku, Chiba, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Akahane
authors.affiliation: Department of Radiology, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Satake
mesh_terms: D000328:Adult; D000886:Anthropometry; D002138:Calibration; D003198:Computer Simulation; D006801:Humans; D007223:Infant; D049449:Luminescence; D009010:Monte Carlo Method; D010388:Pelvis / Q000000981:diagnostic imaging; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011860:Radiography, Abdominal / Q000592:standards; D011874:Radiometry / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods* / Q000592:standards; D014965:X-Rays