Abstract:
:The use of geometrical phantoms for computed tomography (CT) dosimetry can incur errors in the calculation of effective dose due to the anatomically incorrect organ shapes and distributions, and unrepresentative body dimensions. A Monte Carlo program that makes use of an anatomically correct voxel phantom has been developed to calculate effective doses in CT and to compare with conventional dosimetric techniques. The code was validated against the latter by matching the phantom dimensions and simulating whole-body irradiation; agreement to within 6% was found. Effective doses were calculated for brain, lung, abdomen and pelvis CT scans for voxel phantom sizes corresponding to those of standard-sized adult, a teenager and 10% greater than those of standard-sized adult. Errors incurred by using the conventional techniques are minimised if the scan range is set by matching the fractions of radiosensitive organs that are irradiated directly. Under these circumstances, the conventional techniques will underestimate the dose to a 15 y old by up to 22% while the dose to a large subject is overestimated by up to 11%.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Castellano IA,Dance DR,Evans PMdoi
10.1093/rpd/nch521keywords:
subject
Has Abstractpub_date
2005-01-01 00:00:00pages
321-5issue
1-3eissn
0144-8420issn
1742-3406pii
114/1-3/321journal_volume
114pub_type
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journal_title:Radiation protection dosimetry
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