Abstract
20Mar 2017 EVALUATION OF AGD IN DIGITAL BREAST TOMOSYNTHESIS RELATIVE TO THOSE IN TWO-VIEW-FULL-FIELD DIGITAL MAMMOGRAPHY. H. S. Niroshani , H. D. N. S. Hathurusinghe and R. Tudugala. Department of Radiography & Radiotherapy, Faculty of Allied Health Sciences, Kotelawala Defence University, Sri Lanka Department of Radiology, Nawaloka Hospitals Plc, Sri Lanka.
Highlights
A wide kVp range was observed for Digital Breast Tomosynthesis (DBT) than Full Field Digital mammography (FFDM) while mAs range was lower in DBT.According to the results total average glandular dose (TAGD) from FFDM and DBT for diagnostic was 4.21mGy (±1.46SD), for screening 4.04(±1.31SD) andthere was a statistically significant difference between mean values of Total average glandular dose (TAGD)
It was evident that Average Glandular Dose (AGD) from DBT was lower than that for FFDMfurther AGD was reduced by 55.3% by using DBT with compared to TAGD, Corresponding Author:- H
In mammography average glandular dose should be kept minimum due to high radiosensitivity of mammary glands.Chevalier M etal states that TAGD was 3.8mGy and it slightly lower than TAGD from current study.Further mean age and thickness from both study were similar
Summary
The explanatory variables were age, breast thickness, kVp, mAs, target/filter combination, and AGD values of DBT and FFDM. A wide kVp range was observed for DBT than FFDM while mAs range was lower in DBT.According to the results total average glandular dose (TAGD) from FFDM and DBT for diagnostic was 4.21mGy (±1.46SD), for screening 4.04(±1.31SD) andthere was a statistically significant difference between mean values of TAGD. As glandular tissue is radiosensitive organ, the average glandular dose (AGD) to the breast is the most important quantity to estimate the risk of radiation-induced carcinogenesis from mammography.
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