Ab Aziz, Nur Alia Nabihah
(2020)
Study on the factors affecting glandular dose in digital breast tomosynthesis.
Masters thesis, Universiti Sains Malaysia.
Abstract
Digital breast tomosynthesis (DBT) is the type of 3 -dimensional mammography that construct three-dimensional images based on the series of 2-dimensional images. DBT is said to has lower radiation dose than the digital mammography. This study focuses on the factors that affecting the average glandular dose (AGD) in DBT. A total of 224 dose data were included in this study, which is 57 samples for RCC, 55 samples for LCC, 57 samples for LMLO, and 55 samples for LMLO projections. All examinations were performed using the same mammographic unit which is Siemens MAMMOMAT Revelation (Siemens Healthineer, German) at Imaging Unit, Advanced Medical and Dental Institute (AMDI), USM, Penang. For the comparison between 2D and 3D mode in DBT, the different is statistically significant where 3D shown a higher mean of AGD than 2D modes. The multiple regression and correlation tests were used to evaluate the correlation between AGD with exposure setting and breast thickness. There is a positive correlation between the AGD with exposure settings and breast thickness. The mAs and kV settings have a linear relationship with AGD with R2 value of 0.562 and 0.605 respectively for right and left side of the breast. The correlation value of R2 obtained for breast thickness is 0.207 and 0.059 respectively for right and left breast. The denser breast (breast glandularity type D and C) has higher AGD value than less dense breast (type A and B). There is no statistically significant difference of AGD for different mammographic projections.
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