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[Radiation exposure in full-field digital mammography with a selenium flat-panel detector]
D Gosch1, S Jendrass, M Scholz
1Klinik und Poliklinik für Diagnostische und Interventionelle Radiologie, Universitätsklinikum Leipzig AöR. gosd@medizin.uni-leipzig.de
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|June 9, 2006
Summary
The average glandular dose for digital mammography using a selenium flat-panel detector is 1.57 mGy. This dose is comparable to amorphous silicon detectors and lower than screen/film mammography.
Area of Science:
- Radiology and Medical Imaging
- Radiation Dosimetry
Background:
- Mammography is crucial for breast cancer screening.
- Digital mammography systems offer potential dose reduction and improved image quality.
Purpose of the Study:
- To calculate the average glandular dose (AGD) for mammography performed on a full-field digital mammography system equipped with a selenium flat-panel detector.
- To compare the AGD of this system with other mammography technologies.
Main Methods:
- Evaluated 1992 mammograms from 500 patients using the Selenia digital mammographic system.
- Calculated entrance surface air kerma based on exposure factors (kVp, mAs, filtration, breast thickness).
- Determined AGD using conversion factors for a standard breast composition (50% adipose, 50% glandular tissue).
Main Results:
- Mean patient age was 61 years, and mean compressed breast thickness was 58 mm.
- The overall mean AGD was 1.57 mGy per view.
- Specific mean AGD values were 1.46 mGy for cranio-caudal and 1.68 mGy for medio-lateral views.
Conclusions:
- Full-field digital mammography with a selenium flat-panel detector yields an AGD comparable to amorphous silicon detector systems.
- The AGD is approximately 20% lower than that of conventional screen/film mammography.
- This selenium-based system offers efficient mammography with a favorable radiation dose profile.
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