[Radiation exposure in full-field digital mammography with a selenium flat-panel detector].
OBJECTIVE
Calculation of the average glandular dose for mammography on a full-field digital mammography system using a selenium flat-panel detector.


METHODS
Mammographic examinations were carried out using the Selenia digital mammographic system from Lorad/Hologic. 1992 mammographies of 500 patients in cranio-caudal and medio-lateral projections were evaluated. Based on the recorded exposure conditions (tube voltage, tube loading, filtration, compressed breast thickness), the entrance surface air kerma was calculated by multiplying the tube loading by the measured tube output and was corrected according to the inverse square law. The average glandular dose was determined for each exposure by multiplying the entrance surface air kerma value by the relevant conversion factor for a breast composition of 50 % adipose tissue and 50 % glandular tissue by weight.


RESULTS
The mean values for patient age and compressed breast thickness were 61 years and 58 mm, respectively. The average glandular dose was 1.57 mGy for a single view (1.46 mGy for cranio-caudal view images and 1.68 mGy for medio-lateral view images).


CONCLUSIONS
Full-field digital mammography with a selenium flat-panel detector requires a dose similar to that of units with a flat-panel detector based on amorphous silicon and a dose approximately 20 % lower than that of conventional screen/film mammography.
Gosch
D
D
Klinik und Poliklinik für Diagnostische und Interventionelle Radiologie, Universitätsklinikum Leipzig AöR. gosd@medizin.uni-leipzig.de
Jendrass
S
S
Scholz
M
M
Kahn
T
T
D001822:Body Burden; D004781:Environmental Exposure / Q000032:analysis / Q000706:statistics & numerical data*; D019544:Equipment Failure Analysis; D005858:Germany / Q000453:epidemiology; D006801:Humans; D008327:Mammography / Q000295:instrumentation* / Q000706:statistics & numerical data*; D008875:Middle Aged; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D011874:Radiometry / Q000379:methods*; D012062:Relative Biological Effectiveness; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D014963:X-Ray Intensifying Screens / Q000706:statistics & numerical data*