Eatimation of effective doses from a dental cone beam computed tomographic scanner
10.3760/cma.j.issn.0254-5098.2017.03.012
- VernacularTitle:对一种口腔锥形束CT的有效剂量的估算
- Author:
Wei LUO
;
Yue ZHAO
;
Jianchao WANG
- Keywords:
Cone beam computed tomography(CBCT);
Dose-area product(DAP);
Effective dose;
Conversion coefficient
- From:
Chinese Journal of Radiological Medicine and Protection
2017;37(3):222-225
- CountryChina
- Language:Chinese
-
Abstract:
Objective To calculate effective dose based on the dose-area Product (DAP) measured in dental cone beam computed tomograhic (CBCT) scanning and using a conversion coefficient.Methods The method of the DAP was used to calculate the effective dose from KODAK 9500 dental CBCT scanner with fields of view (FOV) of 16 cm×15 cm and 12 cmu×8 cm.The DAP-values (mGy · cm2) were measured using a transmission ionization chamber connected to an electrometer (Doseguard 100,RTI Electronics AB,Sweden) and the chamber was placed directly on the exit of the X-ray tube.All measurements were repeated three times and averaged on each FOV data.The conversion coefficient of 0.080 μSv/mGy · cm2 was used to estimate the effective dose on the basis of DAP values,which was quoted from a literature.Results DAP values were found between the two FAOs to vary from 512 to 1 083 mGy · cm2,and the effective doses calculated with 0.080 μSv/mGy · cm2were 41 to 87 μSv.The effective doses given in this paper was lower than those reported in other literatures.Conclusions DAP measurement was found to be well defined and easy-to-use method of determining effective dose for some CBCT Units.However,determination of specific conversion coefficient in the CBCT must be further developed.
