خلاصه (برای مشاهده کلیک نمایید)
Abstract
Introduction: Breast cancer is the leading cancer causing death in women with 519000
death per year. The recommended methods for early detection of breast abnormalities are:
mammography, clinical breast examination and breast self examination (BSE). However,
mammography has proved itself as the best technique to contribute a reduction in breast
cancer mortality, the radiation related risks of mammography have always been debated.
During the last decade, the advent of digital mammography has presented several
advantages including Computer-Aided Diagnosis (CAD) and Tele-radiography but the new
systems are still not yet completely accepted for use in mammographic examinations.
Aims: This study was primarily aimed to evaluate the mean glandular dose (MGD) from
mammographic examinations in Iran. The study was also conducted to perform a quality
control (QC) program in order to evaluate the quality standards being performed in Iran.
Finally, the study aimed to compare digital mammography technology with film-screen
mammography in terms of radiation dose.
Materials and Methods: Firstly three mammography units underwent quality control
program tests recommended by Iranian Atomic Energy Organization. Then about 1600
mammographic images obtained from about 400 women participating mammography
examination in two different mammography clinics in Tabriz were studied. Images were
obtained by two dedicated mammography units from different manufacturer. An analysis of
mean glandular dose and affecting factors was performed.
2
Results: Mean compressed breast thicknesses of 6.02 and 5.41 cm and MGDs of 1.55 and
2.26 mGy were resulted for film-screen and digital unit, respectively. Significant correlations
were observed between MGD and breast thickness, breast density, applied kVp and mAs.
Conclusion: Despite of advantages presented by digital technology, this technology leads to
a significantly greater MGD to patients when comparing with film-screen mammography
units which use fast screens.
Key Words: Mean Glandular Dose (MGD), Mammography, Dosim