M Kortesniemi et al 2006 Phys. Med. Biol. 51 3269 doi:10.1088/0031-9155/51/12/018
M Kortesniemi1, T Kiljunen2,3 and A Kangasmäki4
Show affiliationsMulti-slice CT provides an efficient imaging modality for trauma imaging. The purpose of this study was to provide absorbed and effective dose data from CT taking into account the patient size and compare such doses with the standard CT dose quantities based on standard geometry. The CT examination data from abdominal and thoracic scan series were collected from 36 trauma patients. The CTDIvol, DLPw and effective dose were determined, and the influence of patient size was applied as a correction factor to calculated doses. The patient size was estimated from the patient weight as the effective radius based on the analysis from the axial images of abdominal and thoracic regions. The calculated mean CTDIvol, DLPw and effective dose were 15.2 mGy, 431 mGy cm and 6.5 mSv for the thorax scan, and 18.5 mGy, 893 mGy cm and 14.8 mSv for the abdomen scan, respectively. The doses in the thorax and abdomen scans taking the patient size into account were 34% and 9% larger than the standard dose quantities, respectively. The use of patient size in dose estimation is recommended in order to provide realistic data for evaluation of the radiation exposure in CT, especially for paediatric patients and smaller adults.
Issue 12 (21 June 2006)
Received 22 November 2005, in final form 22 March 2006
Published 6 June 2006
M Kortesniemi et al 2006 Phys. Med. Biol. 51 3269
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