|
KMID : 0357520070300010013
|
|
Journal of Radiological Science and Technology
2007 Volume.30 No. 1 p.13 ~ p.23
|
|
|
Comparison of Average Glandular Dose in Screen-Film and Digital Mammography Using Breast Tissue-Equivalent Phantom
|
|
Shin Gwi-Soon
Kim Jung-Min
Kim Yoo-Hyun
Choi Jong-Hak
Kim Chang-Kyun
Kim Jung-Min
Kim You-Hyun
Choi Jong-Hak
Kim Chang-Kyun
|
|
|
Abstract
|
|
|
|
In recent years, mammography system is changed rapidly from conventional screen-film system to digital system for application to screening and diagnosis. Digital mammography system provides several advantages over screen-film mammography system. According to the information provided by the manufacturer, digital mammography system offers radiation dose reduction in comparison with screen-film mammography system, because of digital detector, particularly direct digital detector has higher x-ray absorption efficiency than screen-film combination or imaging plate(IP). We measured average glandular doses(AGD) in screen-film mammography(SFM) system with slow screen-film combination, computed mammography(CM) system, indirect digital mammography(IDM) system and direct digital mammography(DDM) system using brest tissue-equivalent phantom(glandularity 30%, 50% and 70%). The results were shown as follows : AGD values for DDM system were highest than those for other systems. Although automatic exposure control(AEC) mode was selected, the curve of the AGD values against thickness or glandularity increased significantly for the SFM system with the uniform target/filter(Mo/Mo) combination. Therefore, the AGD values for the high energy examinations were highest in the SFM system, and those for the low energy examinations were highest in the DDM system. But the curve of the AGD values against thickness and glandularity increased gently for CM system with the automatic selection of the target/filter combination (from Mo/Mo to Mo/Rh or from Mo/Rh to Rh/Rh), and the AGD values were lowest. Consequently, the parameters in mammography for each exposure besides detection efficiency play an important role in oder to estimate a patient radiation dose.
|
|
|
KEYWORD
|
|
|
Mammography detectors, Average glandular dose(AGD), Breast tissue-equivalent phantom thickness, Glandularity
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|